This is another of the circuits with the LM380 that we have in this section. We found it in an article about Walkman amplifiers in the Radio Electronics magazine of March 1986.
This circuit is from old European documentation. R1 depends on the output voltage of the...
This SCR circuit activates a buzzer when triggered. The circuit is from a Popular Electronics from...
This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is...