The circuit was designed to provide an adjustment with a power supply that is symmetrically designed while providing a voltage range of 1.25V to 30V at 1A current. LM317 – an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5A over an output voltage range of 1.2V to 37V and requires only two external resistors to set the output voltage due to its internal
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Tuesday, April 30, 2013
Sunday, April 21, 2013
12V Step Down Dc Converter Using ADP2300 ADP2301
Using ADP2300 ADP2301 step-down dc dc regulators with integrated power MOSFET, can be designed a very simple DC DC voltage converter. Output voltage delivered by these circuits can be adjusted from 0.8 volts, up to 0.85xVin , with ±2% accuracy. The maximum output current that can be provided by ADP2300 ADP2301 regulators is up to 1.2 A load current.12V Step-Down Dc Converter Circuit Diagram
Going for Gold
The title refers to a popular TV recreation express the place the contestants each and every have an important button. The recreation express host asks a question and the first contestant to press their but-ton makes an illuminated indicator remove darkness from on their desk. The other contestants’ buttons are robotically inhibited, so that everyone can see who was once the primary
Saturday, April 13, 2013
Dog Whistle for Ronja
Ronja is the author’s dog, a beagle-mongrel, who seems increasingly frequently to wish to be referred to as to heel either with a shout or with a whistle. And so the theory took place for an digital canine whistle that would produce two alternating excessive-frequency tones. A design like this has a quantity of benefits over standard whistles or nameing. Circuit diagram : Dog
Multitasking Pins Circuit
It’s totally logical that competitively rated miniature microcontrollers have fewer ‘legs’ than their larger brothers and sisters – now and again too few. The creator has given some consideration to learn how to economise on pins, making them do the work of a number of. It passed off that you could make the most the excessive impedance characteristic of a tri-state output. In this approach
Simple Ignition Timer Schematic
This circuit is a tester for flywheel based ignition systems in small aeroplane engines. Basically the same ignition coils are also seen in other small combustion engines used in/on mopeds and lawn mowers in brief, engines without a battery. The part to be tested comprises a primary coil in parallel with the contact breaker. The timing of this contact breaker has to be adjusted
Third Order High Pass Filter
This report focuses on active third-order high-pass filter design using operational
amplifiers. High-pass filters are commonly used to implement high
frequency in a system. Design of Third-order filters is the main topic
of consideration. To illustrate an actual circuit implementation,
separated into two types of filters first-order and second-order.
amplifiers. High-pass filters are commonly used to implement high
frequency in a system. Design of Third-order filters is the main topic
of consideration. To illustrate an actual circuit implementation,
separated into two types of filters first-order and second-order.
Friday, April 12, 2013
6N2P Tube Pre Tone Low Volt Low Cost Circuit
But do not counsel we fire up to 250 Volts Capacitor to find the 350v. The price is expensive and over again.I\r\n recommend creating a 230v. And then use the Cap 250 v. simple to search out \r\ncheap used instead of the sound used to be no difference between voltage 250 to\r\n 230.
Aircraft Warning Light Circuit
This is a design and low cost circuit that can be used for implementing a warning light on the top of tall structures as a warning for low flying aircrafts. It is usually such lights are just stay glow type. Our light in this circuit is a flashing type, and surely this will draw more attention and of course add more safety. This is the figure of the circuit.This operation of the circuit is begin
Repair Nokia N70 N72 White Display LCD Problem By Jumper
Repair Nokia N70 N72 White Display LCD Problem By JumperRepair Nokia N70 N72 White Display LCD Problem Repair Nokia N70 N72 White Display Jumper WaysNokia N70 N72 White Display LCD Problem By Jumpers
Selecting the Right Speakers Surround
When it comes to your surround sound or home theater system, the quality of your speakers can really make or break the overall experience. Good quality speakers are one of, if not, the most important components when it comes to your home theater and surround sound system. You need to take action from the very beginning in order to make sure that you are not getting substandard speakers for your
Power Outage Warning Circuit
5 to 15V supply - LED indicator Adjustable time detection A circuit capable of detecting even a very short power outage, can be useful, mainly if embedded into existing appliances like mains powered counters, timers, clocks and the like. At switch-on of the appliance, the LED illuminates, but pressing on P1 it goes off and remains in this state until a power outage occurs. When power supply is
Reverse Polarity Protector
A series diode is often used as a means of protecting equipment from accidental power supply reversal, particularly in battery-powered equipment. Due to forward voltage losses, this is sometimes impractical. One solution is to use an enhancement mode P-channel power Mosfet (Q1) in series with the positive supply rail. A device with low drain-source "on" resistance can be selected to minimise
Thursday, April 11, 2013
How build a Crystal Tester Circuit
When it comes to frequency generating circuits or rather precise oscillator circuits, crystals become a crucial part, especially because they play an important role for generating and maintaining accurate frequency rates of the particular circuit. However these devices are prone to many defects and are normally difficult to check through conventional DMM units.The shown circuit can be used
12 VOLT AUDIO AMPLIFIER USING TRANSISTOR CIRCUIT DIAGRAM
12 VOLT AUDIO AMPLIFIER USING TRANSISTOR CIRCUIT DIAGRAMClosing SW1 a bass-boost is provided but, at the same time, volume control must be increased to compensate for power loss at higher frequencies. In use, R9 should be carefully adjusted to provide minimal audible signal cross-over distortion consistent with minimal measured quiescent current consumption; a good compromise is to set the
Simple tv transmitter circuit diagram
This is a small tv transmitter circuit wich trasmittes in VHF, negative sound modulation and PAL video modulation. It is suitable in countries where the B and G system is used.
150W OCL POWER AMPLIFIER CIRCUIT DIAGRAM
150W OCL POWER AMPLIFIER CIRCUIT DIAGRAMThe amplifier circuit is very CHEAPEST and Can be powered from 24 to 32 V/5A dual power supply. You must try this circuit. Its working great. Because Transisitor on the final amplifier will of some very hot then add the aluminum finned cooler and the fan so That the transistor is not too high temperatures.Note: Use 24V/5A dual power supply. Connect a
Visitor Alarm Circuit Diagram Using IC 555
Description Figure shows the circuit diagram of the Visitor Alarm . Here I have used a LDR and a mono stable Multi Vibrator for making this circuit . When who breaking the LED ray, the LDR has high resistance so the transistor will be OFF and the pin number two of the IC 555 is negative then the IC 555 will be triggering so the output is ON. When who dont breaking the LED
10 WATT AUDIO AMPLIFIER WITH BASS BOOST CIRCUIT DIAGRAM
10 WATT AUDIO AMPLIFIER WITH BASS-BOOST CIRCUIT DIAGRAMNote:This circuit can be connected directly to a CD player, tuner, and tape recorders.Transistor Q3 and Q4 must be in pairs with the heatsink.Adjust the volume control on the minimum and R3 position with a minimum value of resistance as well. try to switch the circuit set in R3 to read the flow of about 20 to 25mA. Wait for 15 minutes,
Wednesday, April 10, 2013
40 LED Bicycle Light
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time intervals for the two lamps are about 107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs). Two transistors are used
How to build 18W 18W Stereo Hi Fi Audio Amplifier TDA2030
2 x 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It
has good input sensitivity, low distortion, good operating stability
and full protection against overloads and output short-circuits. It can
be used as a booster amplifier for existing small systems or to drive a
second pair of speakers besides the ones already connected to the
system. The board needs a symmetrical
has good input sensitivity, low distortion, good operating stability
and full protection against overloads and output short-circuits. It can
be used as a booster amplifier for existing small systems or to drive a
second pair of speakers besides the ones already connected to the
system. The board needs a symmetrical
AVR Dongle Circuit
This circuit is intended to program AVR controllers such as the AT90S1200 via the parallel port. The circuit is extremely simple. IC1 provides buffering for the signals that travel from the parallel port to the microcontroller and vice versa. This is essentially everything that can be said about the circuit. The two boxheaders (K2 and K3) have the ‘standard’ ISP (in system programming
140W audio amplifier with IC STK070
By using the above amplifier circuit you can hear the sound quality is quite good by a high output power. Maximum voltage circuit pa approximately 55Volt DC. 70-140W output power with impedance 8Ohm.Part ListR1 = 10KR2 = 1KR3 = 0.4RR4 = 0.4RR5 = 4.7RC1 = 0.015C2 = 10uFC3 = 220uFC4 = 0.15uFC5 = 220uFC6 = 47uFC7 = 0.047uFU1 = STK050 , STK070
Junk box Fan Speed Controller
My new home theatre receiver was getting rather hot in the close confines of its cabinet, with the temperature reaching over 40°C after only about 30 minutes of use. To help lower the temperature, I decided to install a fan in the cabinet. A 75mm hole was cut in the shelf under the receiver, and a 12V fan salvaged from an old computer power supply was mounted underneath. The fan was powered
1996 Honda Twin Airbag Wiring Diagram
1996 Honda Twin Airbag Wiring DiagramThe Part of 1996 Honda Twin Airbag Wiring Diagram : light horn, relay box, see cruise control, blue wire, green wire, indicator, connector, left front, rear wheel, power distribution
Tuesday, April 9, 2013
Audio amplifier with IC AN7522 AN7523 and TDA2616
The series of amplifiers that are used on the television audio, amplifier used amplifier ICs, including the IC:• AN7523• AN7522• TDA2616Third series of the function with the same system, namely BTL (Bridge Transformer Less). By using such configuration we get several advantages, namely no use coupling capacitors or coupling transformers.Block diagram of circuit in the IC AN7522, AN7523 and
Wiring Guitar Pickups Bartolini Wiring Diagram Guitar Switch
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A Good Auto Sound System is a Requirement not a Luxury
How do you decide which auto sound system is best for you? This is a question that many consumers ask in the U. S. each and every day. The truth is that only you can decide what kind of sound you find enjoyable and what you are seeking in the sound system you will ultimately purchase. A good sound system will greatly improve how you feel about not only the vehicle you drive but also your
Crossover types
Crossover is a tool that serves to limit the "frequency range" to be received by the speaker. Crossover is used to regulate flow to the tweeter, the midrange, midwoofer, and bass to the subwoofer. There are two kinds of crossover, the crossover passive and active crossover.passive crossover Passive crossovers work after receiving the output of the amplifier, are ineffective because they are
Alternative Halogen Power Supply
Alternative Halogen Power Supply
Readers who do not care to modify the power supply of an old PC into a suitable halogen power source (see our April 2006 issue), may find the present design a welcome alternative. The circuit does not need any changes to the power supply. It allows the halogen lamps to be initially powered from the 5V rail of the supply via RE2, so that they are preheated.
Readers who do not care to modify the power supply of an old PC into a suitable halogen power source (see our April 2006 issue), may find the present design a welcome alternative. The circuit does not need any changes to the power supply. It allows the halogen lamps to be initially powered from the 5V rail of the supply via RE2, so that they are preheated.
PWM controller with 555 timer chip
IC Timer 555 has a basic PWM controller with pulse width control feature 0 .. 100% which is controlled using the R1, at the time of controlling the oscillator frequency relatively stabi so it may be used to build the Simple PWM controller.Frequency of Simple PWM controller 555 depending on the value of R1 and C1, values shown R1 and C1 will form the output with a frequency of 170 to 200 Hz.
Monday, April 8, 2013
Related Products Software Busch Script Lettering Software Software
Free Car Wiring Diagram Software Websites Sites Google Com Mp3car.Best Wiring Diagram Software Ipad Websites Appfinder Lisisoft Com.Related Products Software Busch Script Lettering Software Software.Diagram Software Power Door Lock Suzuki 1997 Golf Window Diagram.Intercom Circuit Diagram Xcom Intercom Wiring Diagram Png.Vag Edc16 Wiring Diagram Websites Softwaretopic Informer Com.Wiring
Remote Operated Home Appliances
Here is the circuit diagram of Remote Operated Home Appliances or Remote controlled Home appliances. Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD, VCR, Air Conditioner or DVD remote control. The circuit can be activated from up to 10 meters. It is very easy to build and can be assembled on a veroboard or a
The Audio Video Distribution Amplifier
With the amount of equipment in home entertainment centers today the need to be able to vary the gain of the audio or video signal is needed. I found this particular circuit helpful when used in conjunction with the Universal Descrambler and a Stabilizer circuit I built for making copies of video tapes. It not only allowed me the ability to fine tune the video strength it also helped
How to Build a 2 Stage Mains Power Stabilizer Whole House
In this power stabilizer circuit, one relay is wired to select the high or the low tap from the stabilizer transformer at some particular voltage level; whereas the second relay keeps the normal mains voltage switched in, but the moment there’s a voltage fluctuation it toggles and selects the appropriate HOT tap via the first relay contacts.A simple power stabilizer circuit discussed here is very
BMW 328i Radio Cassette CD and 6 Speakers Audio System Wiring
The following schematic shows typical diagram of the 1992 BMW 328i Audio System (Radio, Cassette, CD and 6 Speakers System) Wiring and Circuit. The audio system consists of front power distribution box, radio, antenna amplifier AM/FM, instrument cluster, telephone receiver, and speaker.Typical 1992 BMW 328i Audio System Wiring and Circuit Diagram
Superstock Mechanics Workingthrust Reverser Regional
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Sunday, April 7, 2013
Baud Rate Generator
In this article, an RC oscillator is used as a baud rate generator. If you can calibrate the frequency of such a circuit sufficiently accurately (within a few percent) using a frequency meter, it will work very well. However, it may well drift a bit after some time, and then…. Consequently, here we present a small crystal-controlled oscillator. If you start with a crystal frequency of 2.45765 MHz
Cat7 Cables Unshielded Twisted Pairethernet Wiring
Connectlink Wireless Ethernet Wiring Diagram.Figure 3 Tie Eia T568 Ethernet Wiring Standards.Figure 4 Wiring Diagram For An Ethernet Crossover Cable.Ethernet Crossover Cable Wiring.Limited Ethernet Wiring Diagrams Patch Cables Crossover Cables.Ethernet 10 100 Mbit Cat 5 Network Cable Wiring Pinout And Wiring.Tech Info Lan Wiring And Pinouts.Ethernet Cable Connection Between
Overvoltage Protection
When a sensitive circuit must under no circumstances have too high a supply voltage applied, then some means of disconnecting the supply must be provided. One way to achieve this is to trigger a thyristor to blow a fuse. A less destructive alternative possibility is to use a MOSFET to disconnect the supply. An over-voltage protection IC, the LTC1696 from Linear Technology (www.linear-tech.com),
5 Volt Switching Regulator Power Supply
The switching regulator power supply used LM2575-5.0 on this schematic. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the output power (The output voltage x
Mini Audio Signal Generator
A small audio test generator is very useful for quickly tracing a signal through an audio unit. Its main purpose is speed rather than refinement. A single sine-wave signal of about 1 kHz is normally all that is needed: distortion is not terribly important. It is, however, important that the unit does not draw too high a current. The generator described meets these modest requirements. It uses
TDA2030 complete tone control
At this time I present a series of amplifiers that use IC TDA2030, but this series is equipped with a tone control. Tone controls include Bass, Treebel, and Volume. Power amplifier and tone control has been put together in a single PCB.As well as its power supply circuit was also used as one with the power amp, and tone control. Making it easier in the installation and will look
Saturday, April 6, 2013
DVD Player Circuits
However, if this is your aboriginal activity with an HC908 MCU, it is simpler to alpha from a allotment with the user adviser already programmed and known-good hardware, as the bargain M68DEMO908QT4 amateur kit.A QT dent programmed with a tiny user-monitor allows the user to amount appliance programs, abode breakpoints and watch variables with about no aerial for the affairs running. ICD approach
Cat5e Wiring
Cat5e Data Wiring By Michael.Cat5e Utp Outdoor Cable 4 24awg Utp Cat5e Outdoor Cable.Diagram There Needs To Be A Cat5e Ether Cable Connection.Topics Cat5e Wiring Connection Cat5e Wiring Diagram Cat5e Wiring.Ethernet Cat5e Cat6 Wiring.Diagram Of Correct Color Alignment For Making Cat5e Network Wall Jack.Pair 24awg Cat5e Ftp Cable.Diagram Of Correct Color Alignment For Making Cat5e
Guide SCX � presents seat 131 Abarth
SCX ® brings you a great classic from seat, one that will be instantly recognizable to an entire generation: the SEAT 131 Abarth. The distinctive colour navy blue and yellow and the diversity of the air intakes are the main features of this car certainly.The first air has a few flashy lights on both sides of the vehicle front spoiler. The grille is directly in between two pairs of headlights, and
Automatic Night Lamp with Morning Alarm
This circuit automatically turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning. A super-bright white LED is used as the night lamp. It gives bright and cool light in the room. When the sensor detects the daylight in the morning, a melodious morning alarm sounds. The circuit is powered from a standard 0-9V
Create a Digital Volume Control Circuit
This series is the volume of the digital amplifier That is used on or tone control. This series ic type using DS1669 Digital Pot IC specifically for this volume match. a series of settings used at the middle-class amplifier That small powerless under 50 watts.volum11components: C1 = 0.1uf Ceramic, IC = IC DS1669 Digital Pot, S1 / S2 = digital swicthOr you can use the series to this one:volum2The
An Adjustable Power Supply Using Two Amp
This is a circuit for power supply that has an output of 0v to 12v at 700mA with a transformer that is rated at 1-amp (such as M-2155) or 1.4amp for a transformer that is rated at 2-amp (such as M-2156). This is a simple design for power supply. This power supply can adjusted. This is the figure of the circuit.Operation of the circuit is begin, first the mains voltage is reduced to a usable level
Friday, April 5, 2013
Mobile incoming call indicator
Description.This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated.When a call is coming to the mobile phone, the transmitter inside it becomes activated. The frequency of the transmitter is around 900MHz.The coil L1 picks up these oscillations by
Temperature Controlled DC Fan Circuit
This is a simple design circuit based on two transistors, that can be used to control the speed of a 12 V DC fan depending on the temperature. A thermistor (R1) is used to sense the temperature. This is the figure of the circuit.Operation of the circuit is when the temperature increases the base current of Q1 (BC 547) increases which in turn decreases the collector voltage of the same transistor.
Guidecreating Ethernet Crossover Cable
Cat 5 Wiring Diagram Crossover Cable Diagram.Nti Cat5 A V Matrix Switch Diagram Veemux Via Cat5.Tech Info Mixed Lan And Telephone Wiring.Gefen Component Audio Cat5 Distribution Amplifier Wiring Diagram.Wiring Power Over Ethernet Wire 500ft Roll Cat5 Cable 1000ft Roll.Wiring Diagram For An Ethernet Crossover Cable.How To Guide Creating Cat 5 Utp Ethernet Crossover Cable How
Infrared motion detector circuit
Here is the circuit diagram of an infrared motion detector that can be used to sense intrusions.Infra red rays reflected from a static object will be in one phase, and the rays reflected from a moving object will be in another phase.The circuit uses this principle to sense the motion.The IC1 (NE 555) is wired as an astable multivibrator .The IR diode connected at the output of this IC
Is Bigger Better in Auto Sound Systems
When it comes to auto sound systems, one question seems to be repeated often-is bigger better? The honest answer to that is not by a long shot. There are many excellent quality sound systems that will not require the backseat and your first-born in order to enjoy wonderful quality of sound and music as you drive along on your daily commute. One thing that is important to remember is that dynamite
Battery Charger with Temeperature Sensor
Battery with a LM35 temperature sensor on the charger used to monitor the battery temperature is in charge. Battery temperature sensor is needed because the battery temperature will rise at the time in charge. Battery temperature sensor LM35 temperature sensor has high accuracy in monitoring the battery temperature, it is because the temperature sensor LM35 is a temperature sensor that can
Thursday, April 4, 2013
How to Make a Simple LED Automatic Day Night Lamp Circuit
Although the concept may look pretty familiar and common, the main feature of the circuit is its low current consumption and compactness.The power supply used here is a capacitive type, thus no transformer is incorporated making the circuit very compact and fixable in any small corner of the particular premise.The use of LEDs in place of a filament bulb makes the application very power economic
The pair of transistors power amplifier
Already Know about the transistor above? transistor above is one of the transistors that are applied at the amplifier end audio amplifiers. Because the power output and good quality of this transistor is very popular with high-power amplifier makers. Transistors on no other than is 2SC2922 and 2SA1216, transistor pair is already very well known as a reliable amplifier. With a price not too
Low Power 12V Transformerless Power Supply
Many circuits can be powered directly from the mains with the aid of a series capacitor (C1). The disadvantage of this approach is that usually only one half cycle of the mains wave-form can be used to produce a DC voltage. An obvious solution is to use a bridge rectifier to perform full-wave rectification, which increases the amount of current that can be supplied and allows the filter capacitor
Rj45 Wiring Diagrams
Difference Between Straight Through Crossover And Rollover Cables.Figure B 7 Typical Color Codes For A Standard Rj 45 Ethernet Cable.Find More Network Cable Choices And Information From Comtrad Cables.Ethernet Cable Wiring Diagram Crossover Lg.Ethernet Stp Outdoor Ethernet Cable 1000ft Cat5e 568b Wiring.Wiring Cables Cabling Fiber Cat3 Cat5e Cat6 Coaxial Gigabit Ethernet.Crossover
Alarm Power Supply
This Power Supply is suitable for the Modular Burglar Alarm. However, it has other applications. It is designed to provide an output of 12-volts, with a current of up to 1-amp. In the event of mains failure, the back-up battery takes over automatically. When the mains is restored, the battery recharges. Use a genuine alarm type back-up battery. They are maintenance-free, and their terminals can
Light Wiring Diagramwiring Diagram
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Wednesday, April 3, 2013
Quality FM transmitter circuit
This
house FM transmitter for your stereo or any other amplifier provides a
good signal strength up to a distance of 500 meters with a power
output of about 200 mW. It works off a 9V battery.The
audio-frequency modulation stage is built around transistor BF494 (T1),
which is wired as a VHF oscillator and modulates the audio signal
present at the base. Using preset VR1, you can adjust
house FM transmitter for your stereo or any other amplifier provides a
good signal strength up to a distance of 500 meters with a power
output of about 200 mW. It works off a 9V battery.The
audio-frequency modulation stage is built around transistor BF494 (T1),
which is wired as a VHF oscillator and modulates the audio signal
present at the base. Using preset VR1, you can adjust
Lead Acid Battery Charger Circuit
This is battery charger circuit that is use a fly back converter topology, and implements a current-limited power supply to charge lead-acid batteries. This circuit is control by MAX471 IC. This is the figure of the circuit.The flyback transformer provide isolation and voltage input range flexibility, event at supply voltage lower that the battery voltage. Monitoring the charging current is done
Mini Ups System
This circuit provides an uninterrupted power supply (UPS) to operate 12V, 9V and 5V DC-powered instruments at up to 1A current. The backup battery takes up the load without spikes or delay when the mains power gets interrupted. It can also be used as a workbench power supply that provides 12V, 9V and 5V operating voltages. The circuit immediately disconnects the load when the battery voltage
Wireless receiver microphone circuit
Just as in the transmitter circuit, the series of FM Wireless Microphone Receiver Hi Fi also uses an FM audio receiver module. Module used in the circuit FM Wireless Microphone Receiver Hi Fi has a good feture, namely audio FM receiver module has a function that is able to muffle the noise squel. Audio FM receiver module that is used in FM Wireless Microphone Receiver Hi Fi also does not require
Sony Gt200 Sony Xplod Gt200
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Full duplex Intercom
No complex switching required, Simple circuitry, 6-12V supplyThis design allows to operate two intercom stations leaving the operator free of using his/her hands in some other occupation, thus avoiding the usual "push-to-talk" operation mode. No complex changeover switching is required: the two units are connected together by means of a thin screened cable. As both microphones and loudspeakers
Tuesday, April 2, 2013
Triangular Wave Oscillator
This design resulted from the need for a partial replacement of the well-known 8038 chip, which is no longer in production and there fore hardly obtainable. An existing design for driving an LVDT sensor (Linear Variable Differential Transformer), where the 8038 was used as a variable sine wave oscillator, had to be modernised. It may have been possible to replace the 8038 with an Exar
Three Hour Timer Circuit
Manufacturers of cordless drills generally recommend a battery charging time of three hours. Once the charging time is up the battery must be disconnected from the charger: if you forget to do this there is a danger of overcharging the battery. This circuit, which sits between the charger circuit and its battery socket, prevents that possibility: the contact of relay Re1 interrupts the charging
Hubbell Wiring Devices
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Cheap 12V to 220V Inverter
Even though today’s electrical appliances are increasingly often self-powered, especially the portable ones you carry around when camping or holidaying in summer, you do still sometimes need a source of 230 V AC - and while we’re about it, why not at a frequency close to that of the mains? As long as the power required from such a source remains relatively low - here we’ve chosen 30 VA - it’s
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