This circuit is designed to measure very weak currents, in the order of picoamperes. We found it in an American documentation from the 80s. The integrated circuit is from that time.
This oscillator is used to modulate video game signals or even small cameras so that they can be...
Being able to operate with frequencies up to 100 kHz, this circuit was found in a 90’s...
In this transmitter for telephone conversations, found in a 1985 publication, the L1 coil has 4...