Published in Popular Electronics with the curious name of Obnoxious Noisemaker, this 1968 circuit generates random sounds that are reproduced on a loudspeaker. The power transistor can be a BD136.
We found this transformer-isolated control circuit in a June 1995 Electronics Now. The triac must...
This TTL circuit for PC was found in an English documentation from 1992. The integrated circuit used...
We found this circuit in a Popular Electronics from the 90's. The circuit uses three SCRs to...