I've breadboarded a circuit that is not working as intended. Hopefully readers can reference my PNG attachment for clarification. I have a bridge, the input to which is 23 VAC, and the output is approximately 16 VDC. I'm switching this voltage by turning on a NPN transistor which I was hoping to activate a 5 Volt relay. I thought that a 5 volt drop would be created by the 4.7K resistor, and that this drop would fire the relay. I'm assuming that this didn't work because the coil resistance of 124 ohms in parallel with the 4.7K messed up the drop and therefore lacked the necessary voltage to activate the relay. Where did I go wrong? The ultimate goal is to transform the 23 volts to the 5 volts needed by the relay. By the way, without the relay in place there is a 5 V drop across the 4.7K resistor. So I'm not a complete idiot.