The diode bridge was put there by me because I read that the Arduino's analog input can only take voltages in the range of 0V-5V and current up to 40mA, and because a full wave rectifier's signal is better for my project than a half wave rectifier.
The 10K resistors between the transformer and the diode bridge were just part of an audio isolation circuit I found online, I will be tweaking the values as appropriate. The reason I want to connect the scope that way is to be able to check for signal distortion and delay. One probe connected to points A+B, another probe connected to points C+D. I've put an audio isolation transformer (1:1 ratio) in front of the PC's audio port to isolate it so that I'll be able to power the rest of the circuit(s), Arduino included, using a 9V battery.Īlso because I read that not having this isolation (and bridging the battery and PC ground) is a very bad idea.Īnother reason is that I will want to hook up an oscilloscope to this circuit. The purpose is to have the arduino check whether an audio signal is present, and to quickly send a signal from one of its output pins to another circuit, so that my PC will essentially be able to control that circuit through the Arduino.
I'm trying to connect my one of my PC's 3.5mm audio port channels to an Arduino Uno R3.
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