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TRRS jacks with a detect switch are not at all uncommon if you go to an actual electronics supplier, they may only be seeming hard to find if you are shopping hobbyist offerings on general ecommerce sites. Doing electronic detection as the receiving end of an audio signal will not be easy, as you know extremely little about how the source works. For example,...

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Found out the problem on my practical circuit. CONTINUITY problem. I've used jumpers and crocodile clips to connect from source to components. Jumper wires are fine. But this is the first time that I've found out there's also continuity problem in crocodile clips as well. After replacing and testing all the wires' continuity, the oscilloscope waveform shown ...

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Use an op-amp as a voltage follower. simulate this circuit – Schematic created using CircuitLab Pick R1 and R2 to divide 0-5V to no more than 0-3.3V but maybe 0-1V if there is no divider in your board.

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It's a universal (AC / DC) series motor, wired for DC operation through a bridge rectifier. The motor reverses when its polarity is reversed, with the field winding polarity kept unchanged through the second bridge rectifier. Dynamic braking is through the 'D' resistor, which is connected across the motor terminals when it is switched off. The winch would ...

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You can find equivalent resistance of each branch. Replace resistors with equivalent resistors until you have only one resistor left. Calculate voltage and current and then start unwinding again, as you break Req in its components you will find voltage and current at each resistor.

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Well, we are trying to analyze the following circuit: simulate this circuit – Schematic created using CircuitLab When we use and apply KCL, we can write the following set of equations: $$\text{I}_1=\text{I}_2+\text{I}_3\tag1$$ When we use and apply Ohm's law, we can write the following set of equations:  \begin{cases} \text{I}_1=\frac{\text{V}_\text{...

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