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Today, almost all computers contain logic blocks for implementing a USB port. A USB port, in practice, is capable of delivering more than 100 mA of continuous current at 5V to the peripherals that are connected to the bus. So a USB port can be used, without....
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This small InfraRed Remote Control Tester circuit is used for checking the operation of an infrared remote control unit. The circuit is based on the idea of connecting a piezo buzzer directly to an IR receiver IC. The TSOP1738 integrated IR receiver accepts,....
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Two circuits for laser transmitters. The first uses a simple laser pointer module. Any of the normal 3 or 5mW devices will function well. Imports from the USA or Hong Kong are frequently a higher power than the UK approved units. The modules normally contain....
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There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The....
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This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly....
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The brake lights of the automobile trigger this circuit on and off. This save the annoyance of the alarm when it is not needed. This is an older circuit which was published in Popular Electronics Magazine, but still a good circuit today...
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Most of the V/F converters in this chapter produce pulse or square-wave outputs. Many applications (such as audio, filter, or automatic-equipment testing) require a sine-wave output, such as is produced by this circuit. The sine waves from this circuit span....
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Electrical lines which include lighting circuits begin from the main distribution panel of the installation and each line contains three conductors: phase, neutral and ground. All three conductors reach to the terminal point of each luminaire and if it has a....
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The figure shows the schematic for a versatile logic probe. The zener diode clamps the input signal just above the TTL inverter`s 2.2-V trigger voltage. Zener diode D1 can be left out if the probe is going to be used only on TTL circuits. The logic probe is....
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The schematic shown here is a circuit of plant watering watcher or dry soil detector. The plants located in your home or office wants more care as compare to the plants outside. We often forget to water the plants in our home and offices due to load of work....
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Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten....
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Compact circuit, Can be wired in parallel to existing switches This device allows one or more lamps to illuminate at sunset and turn off at dawn.Q1 and Q2....
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This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment..
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A radio controlled electronic flash is a useful item in any photographer s kit. Professionals use them all the time. For example, a wedding photographer w....
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CCFLs are often used to backlight the LCD displays of portable computers Such lamps require a high-voltage sine-wave drive. This circuit provides such drive and permits lamp intensity to be varied continuously and smoothly from zero to full intensity. Notice....
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A blog about new developments in 3D printing, RepRap and Open Hardware A blog about new developments in 3D printing, RepRap and Open Hardware...
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The ICL7665S Super CMOS Micropower Over/Under Voltage Detector contains two low power, individually programmable Voltage detectors on a single CMOS chip. Requiring typically 3A for operation, the device is intended for battery-operated systems and....
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This is a design circuit diagram of a versatile FM transmitter. This circuit doesn`t have a coil. The circuit is simple and easy to assemble. This circuit is work based on gate logic concept. This is the figure of the circuit. The gate N1 acts as a buffer....
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The schematic diagram come from circuit: Car Lamp Charger power supply. Go to that page to read the explanation about above power supply related circuit diagram. Scheme of the Car lamp charger is shown in above. A distinctive feature of the scheme is that....
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This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
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GTP USB PIC PROGRAMMER (Open Source) This work includes, GTP USB (not plus or lite) . The schematic, photos and PCB have been developed by PICMASTERS based....
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A short note describing how to replace crystal and ceramic resonator clock circuits with silicon oscillators and highlighting some of the technical advantages offered by these devices in microcontroller clock applications....
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This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple heat-sinking,....
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The antenna coupling capacitor is a critical component in a regenerative receiver without an RF stage, like the Twinplex. In such a receiver, the antenna is an integral part of the regenerative detector, and for proper operation the coupling to the antenna....
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Here s how to build a pendulum-controlled clock which can be made really accurate. Retro? yes, but an interesting project all the same. You ll need a sp....
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This FM wireless microphone is easy to build and has a large benefit of transmission (about 300 meters, while outdoor). Regardless of its small component count and 3V operating voltage that will easily penetrate the excess of some floors of an apartment....
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The 4049 section is the basic voltage doubler circuit which effectively boosts the 9 V supply to a level of around 15 V which further becomes the supply voltage for the next 555 pulse modulator section. The main feature of this infrared IR LED flood light....
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The main component used is the ACS712 sensor from Allegro MicroSystems to measure the current. It provides economical and precise solutions for AC or DC current sensing in industrial, commercial and communications systems. Located near the surface of the die....
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You can test the board now. For example set the DIP switch to Switch1 ON, Switch2 OFF (15 sec delay) & switch3 ON, switch4 OFF (4 rings to activate half for switching ON). If you want to switch ON relay 1 (connected to RB0 of main circuit) then you have to....