Free Simple Circuit Diagram
This is a variable attenuator circuit. This circuit can be used to reduce the power or amplitude of a signal without appreciably distorting its waveform. Here is the circuit : This circuit uses 2N3685 as a voltage variable resistor with an RDS(on) of 800 Ohm. Using 2N3685 JFET, this circuit will provide excellent electronic gain control because 2N3685 has linear […]
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This is a simple circuit of magnetic pickup phono preamplifier. A proper loading to a reluctance is provided by this circuit. Here is the circuit: The gain provided by this circuit is approximately 25dB at 1kHz (2.2mV input for 100mV output). Referenced to 10mV input at 1 kHz, the S +N/N ratio is better than -70dB and the the dynamic […]
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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 Trimmer Cermet * R2 10K 1/4W Resistor * R3 330K […]
Read moreThis is a metronome circuit that has mechanical sound character. The metronome that has mechanical sound character will make our life more fun and it would be elegant and cool. Here is the circuit : This circuit uses two two 555 oscillators. To make high frequency tone, it uses first oscillator and to produce the beat timing this circuit uses […]
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