Theremin circuit is a device which generates musical effects in response to the capacitive proximity of a human hand. This is the only musical instrument known to the writer that […]
Digital Volume Controller Circuit
The circuit shown here is based on the switching action of transistors, which produce a digital up/down control of an amplifier volume. Volume of a stereo deck can be controlled […]
Simple Logarithmic Amplifier Circuit
This logarithm amplifier circuit provides an output voltage that is equivalent to the logarithm of applied input voltage. The performance of the logarithmic operational amplifier, the circuit diagram of which […]
Constant Volume FET Amplifier Circuit
In numerous occasions it is desirable to obtain an amplifier that gives an output signal of constant amplitude for numerous input signal levels and with the very least distortion. A […]
Stereo Hi-Fi Headphone Amplifier Circuit
This circuit can be used with a stereo headphone for amplifying a low level input signal into a sufficiently high output signal in the headphone. The circuit diagram of the […]
Headphone Loudness Controller Circuit
This Circuit will automatically control the loudness of headphone amplifier volume, so that the is able to listen to the music at the correct level. Numerous contemporary top quality amplifiers […]