Simple 5V regulator (CB8815E)

This simple 5.6 V regulator circuit was found in a 1966’s Philips. The zener can be changed to obtain other voltages.

5 MHz Delay Line (CB6471E)
This circuit uses components of the time. We found it in a 1968 US documentation. The delay is 100 ns...
Dynamic Compressor (CB1292E)
This circuit compresses the dynamic range (amplitudes) of an audio signal. The circuit is passive and...
High Voltage Power Supply for Photocells (CB12891E)
This circuit is from an Argentine publication from 1973. It provides a signal to an amplifier from...