This circuit is suitable for the calibration of old analog oscilloscopes. It was found in documentation from the 1970s and could be useful if someone is recovering an oscilloscope of the time.
The components used in this 80's circuit are uncommon today. The circuit is intended for...
September 2017 - Littelfuse's Polyswitch SMD Resettable PTCs can now be purchased from Mouser...
Also suitable for use as a noisy alarm, this Morse Code or telegraph practice oscillator was found...