This circuit can be used to obtain a zener voltage from a common zener of another value, adjusting in a multimeter. The circuit is from an American documentation of the 1970s.
This circuit controls a heating element using a triac. Triac must be fitted with a heat sink. We...
This circuit is from Radio Electronics. The magazine no more exists, but the circuit can be...
The gain of the Operational Amplifier in the figure is given by the ratio between R1 and R2. In...