Beacon with instrument (CB20495E)

This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by solar panel from 1 V.

Auto alarm (CB16766E)
The trip circuit for this alarm is given in CB16765E. The circuit uses common components and acts...
Regenerative VHF Receiver (CB13502E)
This circuit is from an old American publication from 1970, but it can be assembled with a BF494...
Gas LASER Supply (CB7227E)
This circuit found in 1969 Popular Electronics is used to power a gas laser. The circuit produces...