This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can be the TIC106 need not have a heatsink.
This amplifier provides 20 W of power on each channel, containing separate filters to power a...
In the figure we show how to expand the count from 18 to 26 with 4017 CMOS integrated circuits. The...
This is a circuit published in the patent section of the April 1961 Radio Electronics magazine. The...