Found in Popular Electronics from the 90s, this circuit has LED indicators that show when the battery is full charged and the shutdown relay is activated.
The HV2405E integrated circuit is not very common these days. This circuit was found in the August...
This circuit was found in an American publication from the 60's. Transistors are germanium types of...
This strobe light circuit for car spot adjustment dates to 1987, when there were no electronic resources...