This circuit was obtained from a 1967 GE SCR manual. The SCRs must be rated for the wattage of the controlled heating element.
In the figure we have a configuration that allows to test NPN transistors and with the addition of a...
This circuit can be designed with ease today, as its components are common. We found it in old...
This siren produces an intermitent sound given by the characteristics of the two oscillators using the...