Found in 90s Popular Electronics, this circuit uses common general-purpose transistors in a configuration that has been extensively explored on this site and in our articles.
Indicated for applications with a PC, this circuit was found in an English documentation from...
If you have an old cassette player or bought one from a junk shop, you can set up a small table...
This power oscillator uses an LM380 amplifier. We found it in old English documentation. The C3...