# Share tips you have come across

**URL:** <https://forum.arduino.cc/t/share-tips-you-have-come-across/428745>\
**Category:** General Electronics\
**Created:** [January 4, 2017, 7:20am UTC](https://forum.arduino.cc/t/share-tips-you-have-come-across/428745 "2017-01-04T07:20:57Z")\
**Posts on this page:** 1\
**Showing post:** 671

<div class="post-metadata">

**Author:** ![LarryD](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/larryd/32/215550_2.png) [@LarryD](https://forum.arduino.cc/u/LarryD)\
**Post date:** [March 3, 2019, 3:18pm UTC](https://forum.arduino.cc/t/share-tips-you-have-come-across/428745/671 "2019-03-03T15:18:26Z")

</div>

Build a **Short Circuit Sniffing Power Supply**.

A handy piece of test equipment to have on your work bench is a DIY Short Circuit Sniffing Power Supply.

A small prototyping PCB, a few common electronic components and a plastic case gives a compact test unit.

The PNP transistor needs to have a gain of ~200 while the NPN needs to be ~100.

Q1 has a heat sink attached.

External wires connected to this power supply should be 18 AWG.

See discussion at this link for using this power supply.  
[http://forum.arduino.cc/index.php?topic=601183.0](http://forum.arduino.cc/index.php?topic=601183.0)

Two versions of the power supply are offered in the attached PDF.

 ![ShortCircuitSniffingPowerSupply.jpg](https://europe1.discourse-cdn.com/arduino/original/3X/8/2/82edfc5809cccdf296d6ec77577a79ade307c6cc.jpg)

 ![PowerSupply.jpg](https://europe1.discourse-cdn.com/arduino/original/3X/d/5/d51db5337cd7b4896bd1765c32b14ec8d464488a.jpg)

[Root\_1.pdf](https://forum.arduino.cc/uploads/short-url/3o2zx27pxcezaRwgxNR9zdvEV6N.pdf) (11.7 KB)

---

_[View the full topic](https://forum.arduino.cc/t/share-tips-you-have-come-across/428745)._