[Doug] pulls a signal from the 9V AC power before it hits the bridge rectifier, using a 100K resistor and a zener ... the C code pertaining to this timing circuit. It’s written for PIC but ...

If it’s DC, the easiest way is to use a shunt resistor and measure the voltage across it, and for AC you could use a current ... an amplification circuit, and the ability to be “zero adjusted ...

Using properties of a series circuit, the sum of the voltages across the LED and resistor R must equal the supply voltage. \({V_s} = {V_{LED}} + {V_R}\) Now substitute the supply voltage (\(6V ...

When resistors are connected in series, the current through each resistor is the same. In other words, the current is the same at all points in a series circuit. When resistors are connected in ...