Found in a 90s Popular Electronics, this circuit interfaces the telephone line with an audio amplifier, reducing impedance matching and noise problems.
The voltage gain of the circuit shown in the figure is 10 times. This gain is given by the ratio...
This circuit, from an old Argentine publication, uses a slightly different symbology than we are...
In this circuit we have two oscillators, one controlling the other, using the 4 NAND gates of the...