We found this circuit in a 90s 73 magazine for radio amateurs. The circuit has 3 W of power and can use modern equivalent MOSFETs.
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...