This circuit was found in a Philips documentation from 19678. The transistors are from the period with emphasis on the married pair. Modern equivalents can be used.
This circuit was obtained from an 80's documentation from General Electric. The circuit uses an...
July 2017 - The new Surface Mount SM0402xx LEDs from Bivar can be found on Mouser. The new...
Found in a 90s American documentation, this circuit that was used in cars of the time, detects low...