This circuit uses a feedback integrator. We found it in Ferranti's transistor manual from 1974. Transistors are general-purpose types at the time.
This useful circuit is used to test the insulation of cables, appliances, leaks in high voltage...
This Tesla coil was found in the November 1994 issue of Electronics Now magazine. T1 is a TV...
We found this circuit in an old European technical documentation. The circuit can be implemented with...