Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of the era, the PA237. The circuit runs on 24 V and excites a 16-ohm speaker.
This circuit can generate signals in the VHF range and can be used as the basis for small...
This circuit uses a LM3900 Norton amplifier and a 2.7 V zener diode to supply a current of 1 mA to...
This circuit provides a reference voltage of 2.5 V adjusted in the trimpot. The transistor can be...