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.
The combination of diodes determines which of the LEDs will light when one of the switches is...
The component used in this circuit that we found in an old documentation, is not easy to obtain...
This circuit has a sensitivity of 2uW. We found it in documentation from the 1980s. The integrated...