This circuit was found in a 70s documentation. The transistor is from that time. L1 has 4 turns of wire 20 in the form of 3/32 inches and L1 has 10 turns of the same wire,
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...