Transistorized VU (CB21729E)

The instrument of this circuit can be a common microammeter. The circuit has its operating point adjusted in the trimpot.

Vibration Sensor LM10 (CB14310E)
The integrated circuit used in this project is unusual. However, we can take advantage of the...
Residential Alarm (CB17984E)
This alarm, found in a 2002 documentation, uses several sensors and has a 12 V supply, not...
Field Strength Meter (CB13667E)
This instrument was found in a publication for radio amateurs in 1973. The tuned circuit consists of...