This circuit can generate signals of different frequencies, switched by a DC voltage. The frequencies are determined by the crystals. The circuit is from a 90s American documentation.
This circuit for currents from 500 mA to 1.5 A was found on a Ham Radio from the 90s. R4...
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...
Found in a 1980s documentation, this amplifier features high common mode rejection. The operating...