5 V x 5 A regulator LT330A (CB14597E)

The circuit presented is from LinearTechnoloy Applications from 1993. Semiconductors are uncommon and the precision depends on the resistors used.

Light Activated AND Gate 2 (CB5318E)
This circuit can be implemented with standard photodiodes consisting of a two input optical AND gate....
Two-Digit Counter CIR25397S CB25373E (CB25373E)
This TTL counter was found in the March 1991 issue of Radio Electronics magazine. The circuit is...
Wide Dynamic Range Light Detector (CB12527E)
The circuit shown in figure uses a photodiode as a sensor element and its main feature is to have...