This traditional configuration found in a Radio Shack document can use 2N2646. More keys can be added, and the power can be supplied with voltages from 9 to 15 V.
Small power transformers can be used on this circuit. The high voltage generated has a maximum...
We found this circuit in an old Radio Electronics. The transistors can be the BC548. The circuit...
The circuit shown enables dynamic diode testing with an oscilloscope. We found this configuration in a...