This circuit only works with incandescent lamps and the frequency is adjusted in the pot, depending also on the capacitor. The triac must be equipped with a heat sink. The circuit is from an 80s manual.
Published in an old Popular Electronics, this circuit makes use of components that are still...
This modulator circuit for transmitters was found in American documentation from 1964. It can be...
This circuit for frequencies from 1Hz to 100 kHz was found in the June 972 Radio Electronics...