This sequential tone generator circuit was found in the July 1980 issue of Radio Electronics magazine. It uses well-known integrated circuits. The tones are generated by programming resistors.
This circuit makes use of an old operational and matched transistors. The circuit can be...
This sound relay, Vox or acoustic switch has a bistable action triggering a relay when the...
The circuit selected is from the 1960 Mullard transistor reference manual. The circuit is powered by...