This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V outputs from 0 to 9 V signals. Transistors may be equivalent.
Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be...
The input resistance of this circuit is 60k and the pass band from 20 to 20kHz. The circuit is...
This circuit is from a publication on Motorola triacs from 1975. In it we have the way to fire a...