This circuit was found in an Electronics Now from the 90's. The integrated regulator circuit and the power transistor must be equipped with heat radiators.
This interesting sine wave oscillator circuit for the audio track uses an incandescent light bulb...
June 2017 - Mouser Electronics has the new Texas Instruments OPA167x series operational amplifiers available...
I found this simple circuit from an English magazine from 1984. The circuit can be easily...