1-quadrant logarithmic converter (CB7333E)

This temperature compensated circuit was found in a Popular Electronics from the 90s. Integrated circuits and transistors are from that time.

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Light Activated Switch (CB14457E)
This circuit is from 1968 documentation. We can assemble it with more modern components such as a...
Speaker protection (CB8193E)
Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in...
UV Sensor with UVTRON Tube (CB25942E)
The UVTRON tube is an ultraviolet radiation sensor. In this circuit from Radio Electronics from...