This circuit found in 1969 Popular Electronics is used to power a gas laser. The circuit produces a continuous voltage of 1,600 V. Diodes are high voltage types.
This simple metronome, from 1985 documentation uses only transistors and has two settings. For...
This circuit is suitable for modulating AM transmitters. The circuit is from a 1977 radio amateur...
This flasher was found in an old Hands On, but uses common components. The optocoupler can be...