555 audio ohmmeter circuit This is a 555 audio ohmmeter circuit. Some times, we need to measure roughly the resistances only. In this we can know the resistances by the audio so also fast check. This circuit will use the resistors that unknown value to compare with many the reference resistors. In Figure 1 is […]
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This wien bridge oscillator circuit which is normal,low distortion and can easily adjust the resonance frequency that depends on the pair of the resistors (R) and capacitors (C). Which we can calculate by the formula. F = 1/2 p RC In this circuit as Figure 1 the oscillator are based by the R that include […]
This is the 3,000 watts Dimmer for inductor load example: the Electric Fan, AC motor,Electric drill etc. But most general dimmers is used for resistors load only such as lamp, soldering iron, heating coil,etc. Why our project can do? The normal dimmer cannot use for inductor load, because the phase of current and voltage drop […]
If a DC power supply not enough for your job. The most cause come from the lower current of the transformer,which changing them is hard and expensive. This way maybe help you! Since the most transformers always is the center trap form for a dual power supply. For example: The transformer as Figure 1; The […]
This is an easy telephone amplifier circuit. It will increase the signal of the telephone lines up. Then, drive the relay to controls the large electric bells that louder than a general phone. This circuit is modified from the speaker protection circuit, so easy and cheap. How it works Figure 1 the circuit diagram. After […]