This circuit triggers by choosing the higher of two voltages. The circuit is from a 1964 Electronic Design. The transistors are of the time and can be replaced by current equivalents.
In a voltage follower, the voltage gain is unitary, the input impedance is very high, and the...
This circuit has the coil tuned input according to the operating frequency range. The indicator can...
This circuit was originally designed for the practice of Morse code, something common in 1966, the year...