This stabilized source can supply currents up to 700 mA and the output voltage is close to 15 V. a little less with the load. The power transistor must have a good heat radiator.
The operational amplifier used in this application is not the most common today. The circuit is...
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V...
This circuit was found in a Japanese publication from 1971. The circuit uses components from the...