This circuit is from old American documentation, using a regulator integrated circuit that is uncommon today. The diodes can be 1N4002 and the transformer has a 500mA secondary.
This is the decoder circuit for the previous encoder (CB17011E) using integrated circuit MC14028. This...
This simple voltage regulator or stabilizer uses only two component and can source up to 100 mA to a...
We found this preamplifier for the 10 and 11-meter range in an old documentation for radio...