The used diode is an unusual component today. We found this 12 V regulator in documentation from the 90s.
This radio version with a transistor for a crystal phone was found in a Japanese magazine from...
For the component values used in thisf this circuit, the frequency can be adjusted between 740 Hz and...
This simple source is indicated for voltage regulators of 5 A x 12 V as the one found in CB17141E. The...