![]() ![]() When I push the tactile pushbutton the relay turns on, when I let the button go, the relay stays on. In reality the 3.3V signal will come from an ESP8266 but on my breadboard setup its coming from a power supply. I have a very standard NPN low side switch setup to turn a relay on/off from a 3.3V signal. You can find another excellent demo of this circuit here.I've been pulling my hair out over this for weeks and I can not for love nor money work out why it's not working. Once C2 fully discharges, Q1 will be turn back on and we're back in the state we started in.While Q1 is off, C1 can charge, relatively quickly through R1. ![]()
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