This voltage inverter uses a small transformer. The circuit was found in the April 1995 issue of Electronics Now magazine. The output current is very low.
The circuit shown uses the 741 operational amplifier, but lower noise and higher gain equivalents...
This tuner circuit was found in an old English documentation. The JFET can be any general purpose...
This filter was found in a publication for radio amateurs in 1977. The components can be changed for...