We found this circuit in a 1965 Electronic Design. Transistors are still common but admit equivalents for some of them. The circuit drains a current of only 4 mA.
This circuit was found in a 90s Hands-on Electronics. The transistor can be a BC548. What it does...
This circuit was obtained from a 1985 Electronic Desing. The circuit uses a Darlington which may be...
This circuit makes use of a commercial type current transformer. The circuit is from a 2005 Linear...