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 car theft alarm circuit in a 1988 publication, but the components used can still be...
This is stage is transformer coupled and was found in na old publication of the year 1958. The...
Found in documentation from the 1980s, this amplifier uses an integrated circuit from the time....