The configuration shown was found in an old Poptronics but can be easily assembled using a common calculator photocell. The relay is according to the supply voltage.
This dimmer configuration is quite old, as it was found in a 1967 publication. The triac can be of...
One of the problems with common 3-terminal regulators is that the internal reference, normally 1.25 V,...
This circuit consists of a traditional version amplifier with complementary output transistors...