This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
This power source was found in a 1968 Electronics World. The transistors are from that time. The...
This circuit was found in a 1986 documentation. The circuit uses 12 V relays and is powered by a...
This circuit amplifies VHF signals in the two-meter range and is very critical, especially...