With an 18 V input, this regulator was found in Philips documentation from the 60's. The transistors are from that time. The power transistor must have a heatsink.
November 2016 - The Arduino Zero board, a 32-bit extension of the Arduino Uno for innovative IoT...
We found this circuit in a 1967 Electronic design. However, it can be easily implemented even...
This circuit is the version of the previous circuit with a single source. The transistors are...