I have built a very basic Pre-Amp unit to solve a low volume output problem on another project I have been working on.....It works very well, but I now wish I had fitted an LED into the circuit to show when power is ON, ( i fitted a simple switch that is a push to lock on which by sight tells you nothing)
My question to you learned chaps is If i fit an LED across the SWITCH WIRE and the NEGATIVE connection, when the unit is switched on, will the LED light up. I know I will also need a resistor in series with the LED, so my next question is what value resistor will i need.
here is the "fag-packet" drawing of my unit. The unit is powered via a 9v Battery
My question to you learned chaps is If i fit an LED across the SWITCH WIRE and the NEGATIVE connection, when the unit is switched on, will the LED light up. I know I will also need a resistor in series with the LED, so my next question is what value resistor will i need.
here is the "fag-packet" drawing of my unit. The unit is powered via a 9v Battery