This circuit of dozens of watts uses germanium transistors and the critical components are transformers. The circuit is from the 1960 Mullard transistor application manual.
This circuit uses an old National Semiconductor operational amplifier, but it can be implemented with...
In this circuit the regulation is made from a circuit in the LED cathode. The configuration is...
For the component values used in thisf this circuit, the frequency can be adjusted between 740 Hz and...