Found in a 1980s telecommunications documentation, the circuit presented acts as a product detector. The modulator or mixer in the square may be that of the previous circuit.
This 12.5 W quasi-complementary amplifier was found in a 1969 General Electric publication. Note the high...
This filter has a cut-off frequency of 1 kHz by letting pass those that are above this value. The...
Placed near a telegraphic transmitter (CW) and with a small antenna or pickup, it reproduces the...