Found on a 1965 Radio Electronics, this circuit fires a signal xenon lamp applied to the SCR from an external trigger. The pulse transformer generates high voltage for flash triggering.
An oscillator whose frequency can be adjusted between 500 Hz and 5 kHz with the use of a...
This circuit protects the speakers in case the amplifiers have problems. With a continuous voltage...
This circuit is from the 80's and can be implemented with modern equivalent components. R1 is 2M5,...