This circuit for analog TV was found in a 90s EDN. The integrated circuits used are from that time and may present some difficulty in obtaining.
The existence of field effect transistors at the input of the integrated circuit (operational...
This circuit generates a siren sound. It was found in the April 1969 Radio Electronics magazine. The...
Suggested by Siliconix in documentation from the 90s, this circuit can present gains of digitally...