This circuit was found in the December 1992 Radio Electronis magazine. R2 is an NTC, there is a MOV protector or NTC thermistor. The current depends on the thermistor used.
January 2017 - Omron G7L-x relays for PCB mounting can now be purchased from Mouser Electronics. These...
Suggested by an American publication of 1964 this circuit is intended for the capture of signals...
The circuit shown is from the component's datasheet, allowing the control of stepper motors up to...