The power transistor of this circuit can also be the TIP42 mounted on a good heat sink. The circuit is from old European documentation and the integrated circuit used is not very common today.
This is yet another version of the light-controlled oscillator that can be found on this website. This...
Originally created to feed the filaments of a 12AX7 as an audio preamplifier to eliminate the...
The incidence of light in the LDR causes this circuit to start operating, emitting a sound whose...