Found in a Popular Electronics from the 90s, it applies to the old answering machines that used tapes. It emits a warning beep on the drive.
This circuit provides 70 W at 8 ohms and 100 W at 4 ohms. We found this amplifier in a 1992...
This circuit was obtained in a 1989 publication and is quite simple to assemble, but critical in...
This amplifier with a few watts of power was found in a Japanese technical documentation from the...