Neon Fuse Blown Monitor (CB24104E)

This circuit was found in the January 1971 Radio Electronics magazine. It keeps the light flashing if the fuse blows.

MOSFET Parameter Meter (CB21398E)
This circuit was found in a 1964 MOSFET applications manual. The circuit uses period general...
RIAA Preamplifier (CB18871E)
This circuit is from a Japanese documentation from 1971, using transistors of the time. The...
Sgnal tracer (CB23815E)
This circuit uses Only passive components and have to be plugged to the input of an audio...