After I posted my plans for XLR cable tester to Facebook audio DUY group, there was discussion on similar circuits other people has made.
Steve Smith wrote (put here with his permission):
“If you’re into making your own stuff, this will show up any fault with a mic cable when connected to phantom power. Three green LEDs shows a good cable, other combinations show faults.”
This looks like a quite nice and simple to build circuit if you have suitable dual color LEDs on your hands. The circuit is powered with 48V phantom power from audio mixer. The zener diode in this circuit is here to detect the situation that pins 2 and 3 have been shorted to each other. The resistor is here to limit the current through the LEDs.
This circuit looks to be in functions pretty similar to Sound Tools XLR Sniffer/Sender at https://www.ratsoundsales.com/mm5/merchant.mvc?Screen=PROD&Product_Code=soundtools-xlr-snifsend
I finally got all the components to test the circuit. This circuit design worked well on my initial tests with my circuit test prototype.
For comparison here is my circuit where I used three single color LEDs, three diodes and two resistors:
13 Comments
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https://soundtools.com/cable-testers.html
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Telegram中文 says:
This article provides a practical guide to making an XLR microphone cable tester, which is great! If you also like DIY electronic projects, I recommend you to join some related audio DIY groups on Telegram中文 to share and discuss these interesting circuit designs with more enthusiasts.
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I am glad to see that this article provides a detailed XLR cable tester circuit diagram. If you have similar DIY projects or experiences, please share them with everyone on Telegram 下载 to discuss more electronic engineering and audio technology.
Telegram ios says:
Telegram 中文 groups have been discussing various DIY audio tools like this! Your LED indicators are such a practical way to show cable issues, especially when working with phantom power. It’s great to see how everyone has their own approach to testing gear.”
Telegram cn says:
I’ve seen some cool conversations on TG纸飞机电报中文官网about building these kinds of testers. Your design with the three green LEDs is straightforward but effective—ideal for quick checks in the studio. Have you thought of adding more diagnostic features?”
TG CN language pack says:
In one of the TG CN language packcommunities, they shared a similar idea but with a twist for detecting intermittent faults. Your setup looks more solid though, especially with the clear LED indicators. Phantom power testing is a great addition!”
TG中文 says:
The design of the XLR microphone cable tester is really creative, especially using the 48V voltage provided by the phantom power supply for circuit testing! This DIY method is refreshing, and this simple circuit can really help troubleshoot common problems. Interestingly, in the DIY audio community on Telegram中文, such projects can also be widely shared and exchanged. Many enthusiasts will upload their improved circuit design drawings in the group, so that we can learn new knowledge at any time.