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NPN BJT and Zener diode maintain close to 12 volts across a load between 12V to 20V by Electronzap (electronzapdotcom) View | |
NPN BJT emitter follower sets about 10mA through 5 series red LEDs at 12V to 20V (electronzapdotcom) View | |
LM358 op amp low versus OK supply voltage indicator LEDs with schmitt trigger output electronics how (electronzapdotcom) View | |
Voltage Divider With Zener Diode (tinkering.online) View | |
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