Free Simple Circuit Diagram

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Electronic Metronome

If you studying music playing, you should have a metronome. Today, electronic metronome is much more popular than mechanical metronome because the electronic metronome has several advantages. They are compact/small, reliable, cheap and very simple. Here is one example of the electronic metronome circuit : Parts: * R1 10K 1/2W …

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5V Switching Regulator, Very Simple Circuit

Switching Regulator for High Power Efficiency When you should regulate a high voltage to a much lower voltage, switching regulator must be the only choice. Fortunately,  a simple switcher integrated circuit chip is available, let you build a complete step-down switching regulator using five components. The switching regulator IC used in …

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Max4373 Electronic Circuit Breaker

This a high-side current amplifier circuit breaker. The circuit-breaker application is possible for that device because  the latching-comparator output (COUT1) on the MAX4373, a high-side current-sense amplifier with reference and comparator. Here is the circuit : This circuit uses MAX4373FESA as a circuit-breaker threshold of 900mA, because its gain from sense …

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100 kHz Free Running Multivibrator

This free running oscillator employs LM111 comparator. The output of this oscillator is square wave. You can use this square wave oscillator for general purpose. Here is the schematic diagram of the circuit: [Source: National Semiconductor Application Note]

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Simple pH Meter Circuit, A Low Cost Adapter for Your Digital Voltmeter

What is A pH Meter? A pH meter is actually a precise voltmeter  that measures the generated voltage of a pH electrodes. The requirement of such meter is high input impedance and has the gain of  voltage-pH conversion. The standard pH probe generate voltage about 59 mV per pH,  so all we …

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Super Simple Inverter

This is example of a simple inverter that can be used to power fluorescent lamp and a small strobe. This circuit will produce over 400VDC from a 12 VDC, 2.5 A power supply or marine battery or an auto. This circuit is very simple because it does not require custom transformers or coils. Also all …

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