This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined by L1. The integrated circuit used is uncommon today.
The transistor can be the BD135 and this circuit, found in a 1978 publication, can be powered by...
We find this circuit in an American publication of 1978. It is intended only for cars that have...
This circuit is from American documentation from the 90s. The transistor is general-purpose and...