This circuit supplies a load at SO1 when the load at SO2 is powered. The circuit is from a Popular Electronics from the 90s. Diodes and triacs must match the loads.
This 4.5 MHz oscillator, or according to the crystal, was found in American documentation from the...
This alarm circuit is from a 1987 publication, however the components used are still modern. The...
This circuit is a variation of the previous one, containing a modulation input. The components are the same....