1-minute delay (CB21408E)

This circuit with PUT is from a 1967 General Electric manual. The relay must have voltage according to the supply.

SCR Passage Alarm (CB13378E)
We found this circuit in an old documentation from the 70s. The sensor is an LDR that must be...
2 meters preamplifier (CB20274E)
This circuit with junction field effect transistors was found in documentation from the 1980s. The...
1.2 to 1.4 V Power-Supply (NI025E)
Common general purpose silicon diodes when direct biased provide a voltage fall of about 0.6 to...