Can Anyone Help Me Find Ideal Component Values For This Audio Cable Tester? - XLR/MIDI/TRS

Thread Starter

Jimmyjam

Joined Mar 28, 2018
2
Hi, Everybody. Can Someone help me calculate Component values in a simple continuity tester for audio cables that must consist of 3 resistors, 3 LEDs(red,yellow,green), 2 TRS 1/4” Stereo jacks (l&r), 2 TRS 1/4” Mono jacks(l&r), 2 TRS 1/8” Jacks(l&r), 2 XLR (m&f) jacks, 2 MIDI (m&f), and a battery power cell?

Like this plot image:

22D1DDCE-E9AE-438E-AB5D-0BDB63BDA636.jpeg
 

MrChips

Joined Oct 2, 2009
19,734
You are missing a vital piece of information: the voltage of the battery.

Once you know the voltage V of the battery, you can calculate the value if each resistor using Ohm's Law.

For example, if you wish the LED to be lit with 10mA,

R = (V - 2) / 0.01
= ( V - 2) x 100

approximately
 
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