Photometer with LDR (CB23764)

This circuit with analog indicator and diode bridge was found in Radio Electronics magazine from August 1961. The circuit uses an LDR as a sensor.

Electronic Dice (CB12221E)
This TTL dice is from an old publication from 1978, but it can still be assembled, as the...
Full wave rectifier (CB9455E)
This precision signal rectifier was found in an Electronic Design. The components used are from...
OR gate LM3900 (CB14200E)
We found this setting in the National Semiconductor Linear Applications Handbook. The base is an...