This circuit for photography uses was found in the Electronics Experimenter Handbook Special projects magazine from 1983. The bargraph circuit powers 8 LEDs.
This circuit, bridge type, was found in American documentation from the 60's. The transistor is...
This inverter is critical for transformers and can use modern equivalent transistors like MJ2955 on...
This low-current power supply was obtained in Japanese documentation from 1968. The currents are...