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Products => Test Equipment => Topic started by: PixieDust on November 10, 2022, 03:53:13 am

Title: Continuity Tester Idea
Post by: PixieDust on November 10, 2022, 03:53:13 am

Found this little nifty device on YouTube:

https://www.youtube.com/watch?v=N2M-p-OGvPg (https://www.youtube.com/watch?v=N2M-p-OGvPg)

Refer to video description for additional references.

Title: Re: Continuity Tester Idea
Post by: Gyro on November 10, 2022, 10:06:43 am

Its main problem is that it puts out a fair amount of voltage and current, enough to turn on semiconductor junctions and potentially damage the sensitive ones (and exceeds most IC protection diode limits). An ideal continuity tester should put out less than about 400mV max to avoid turning on Schottky junctions and with reasonably low test current.

It's still possible to do this, and achieve <1R resolution by using a bridge circuit.

Title: Re: Continuity Tester Idea
Post by: threephase on November 11, 2022, 10:50:28 am

Whilst I understand the comment, in the design criteria in the video, he stated that he wanted it to test LEDs and diodes, which I presume is why he opted for a higher test voltage and current. Even at the test voltage it operates at, it might not be able to test all LEDs.

I do find it a good video, well explained in how he built the design up.