We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs operating with both low continuous voltage and high alternating voltage.
This circuit, found in a 1980 publication, limits the amplitude of the output signal to a value...
This VFO was found in a 1980s documentation. The central frequency is given by the crystal and the...
This traditional complementary configuration is from 1990 documentation. The transistors must have...