This circuit from the 60's uses germanium transistors of the time. Listening is done on high impedance headphones.
This filter was found in the October 1969 issue of Radio Electronics magazine. The frequency...
This low-power, low-supply voltage amplifier uses a preamplifier to achieve a high-gain...
In a bistable circuit, as shown in the figure, we use two sensors. When one of them is touched, the...