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,
This circuit encodes the two channel signals from an amplifier for a multiplex-stereo...
This radio for the medium wave band was found in an old American documentation. The transistors are made...
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...