Make stereo system to 4CH audio system, Learn more!
To change the voltage to current
Simple A/D amplifier circuit!
This dynamic compressor circuit that The reduction rate of signal up to 20 dB at input between 100 mV to 10 volts. This circuit does not use external power [...]
See idea: Voltage to frequency converter circuit use CA3130 OP-Amp, that linearity Of changing up to 0.5% and Temperature coefficient.
Usually an analog to digital converter circuit or A/D that need high accurate devices and and high difficult. But this circuit all error does not affect.
This is a create special 3D stereo sound circuit. Which sound is a dimension to the listening. Using the some low frequency to appear out left and right