This circuit was found in Philips documentation from 1969. The components are from the time including transformers that are commercial types.
This circuit preheats incandescent lamps, thus avoiding the impact of the current when switching on,...
The circuit shown is from a 1978 Texas Instruments optoelectronics manual. The circuit can use...
Suggested by General Electric documentation from 1968, this circuit activates a relay after 60...