This low power circuit was obtained from an American 80's documentation. The circuit indicates the voltage of a battery being trimmed by the trigger point. The transistors can be the BC549.
This circuit is from Motorola's 1990 Linear Databook. We can implement it with other operational...
This power supply is protected from shorts in the load. The BD135 must be mounted on a heatsink...
We found this circuit in a Poptronics of the 90s. The circuit operates from 100 kHz to 30 MHz and...