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I'm new to electronics, trying to build a headphone amp, the circuit diagram , that I have is for mono-amplication , it states that for stereo you need two circuits.
Are the two circuits connected via the earth or the -ve track?
Or is one connected to the +ve and the other to the -ve...
diy macro ring light
Building my own macro ring light, with a regulated power supply and 12 LEDs connected in parallel, what is the formula for calculating the current limiter resistor, that I have to connect before each LED and what information do I require to calculate the ohmic value...