Found in a 1967 General Electric documentation, this meter uses Nixie tubes, popular at a time when LED and liquid crystal displays did not yet exist.
This circuit activates a relay by activating one of a series of optical sensors that can be...
We found this circuit in a 1980 documentation. The circuit produces popping or beeping sounds on a...
This 12 V to 110 V inverter with 100 W was found in a 1977 Signetics manual. The transformer must...