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.
April 2017 - Littelfuse's new two-way discrete TVS diodes for protection against ESD up to 30 kV...
This circuit was found in an American publication from the 1980s. It can be made with most current...
This circuit was obtained from an 80's Radio Electronics. The circuit decodes “scrambled” or...