Found in old documentation, this source uses an integrated circuit from that time, which is uncommon nowadays. The power source has a ripple below 1 mV.
August 2016 - It can be purchased from Mouser Electronics new chips from Dialog Semiconductor, the...
With this circuit it is possible to fire an SCR from the light that falls on a phototransistor. The circuit...
Interval pulses emitted by this circuit are picked up in a medium wave radio nearby. The circuit is...