Preamplifier for tubes (CB23605E)

This preamplifier with 1 CK722 transistor was found in Radio Electronics magazine from May 1959. Power comes from the tube circuit itself.

Emergency Lighting (CB17043E)
This circuit from a 1995 documentation triggers a set of lamps when the power goes out. In a more...
Remote Control Receiver (CB502)
With a coil formed by 7 turns of 26 AWG wire this circuit operates in the 27 MHz range. But you...
Simple Multimeter (CB16271E)
The assembly of a good multimeter meets only one obstacle: the precision that is obtained depends on...