We found this circuit in a Philips documentation from 1965. The circuit uses a common LDR sensor and the transistors are general purpose types. TR2 can be a BD135.
This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and...
Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current...
This regulator was found in a 2005 Linear Technology component manual. It is based on the LT1635...