The MC33364 starts at around 1V, and the MC44608 toggles at 65 mV. Because of the diodes, you clamp V DEM between ±600 mV, which could not trigger the MC33364. A small offset from the internal ...

Select a relay to operate with the reverse-polarity voltage. For example, use a 12V relay for a 12V supply system. When you apply correct polarity to the circuit, D 1 becomes reverse-biased, and the S ...

By combining 49 of them he’s put together a soda bicarb diode steering circuit for a 7-segment display capable of showing the digits 0 to 9.