Photometer for enlarger (CB8342E)

This circuit for old photo enlargers was found in a 1970s RCA manual. The components are from the time, but modern equivalents can be used.

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Signal Follower (CB3919E)
This signal follower is from a 1970's documentation. So it uses the traditional configuration at the time...
Digital CMOS Switch (CB16601E)
This bistable touch circuit using CMOS technology controls a relay. The supply voltage must be...
Timed Intermittent Alarm (CB17488E)
We found this circuit in a 1986 publication. However, as it is based entirely on 555 integrated...