We found this circuit in a 1985 documentation. The transformer is an old TV flyback that has an exposed part of the core, where 10 to 20 turns of common wire are wrapped.
This simple digital circuit tester can work with TTL technology when powered by 5 V and with CMOS...
This circuit generates 24 V positive from a 12 V supply. The maximum output is 1 A and the power...
This small power supply for low currents (5mA) is suitable for power low-power TTL experimental circuits....