This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
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...