This control circuit using a low voltage switch was found in the September 1987 Radio Electronics magazine. The triac must be matched to the load and the mains voltage.
This circuit has a 60 dB gain and a bandwidth of 68 MHz. We find it in Maxim's documentation. ...
Figure 1 shows a hal-wave voltage doubler operating with the Power-supply voltage. Output current...
This circuit uses an SCR as an active component, working only at short distances. The circuit was...