Process timer (CB21865E)

We found this timer for times of a few minutes in a 1974 Ferranti transistor manual. The relay is 37 mA sensitive type.

AC SCR Fast Switch (CB13898E)
This circuit switches a load in 0.013 ms after closing the switch and after the start of each...
Continuity Test (CB22130E)
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
Dynamic Load (CB1499E)
The purpose of this circuit is to test power supplies functioning as a variable load that can...