This circuit is based on a regulator component that consists of a transistor and zener in the same package. The circuit can be designed with the equivalent discrete configuration. The current is 200mA.
This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and...
This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay...
We found this circuit in a 1978 documentation. Its purpose is to avoid current spikes in a small...