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Search: Posts Made By: redwire
Forum: Equipment Usage, Soldering, Techniques, and Reviews 07-02-2022, 07:51 PM
Replies: 154
Views: 30,995
Posted By redwire
Re: New tool to find short capacitors on motherboards : shorty with display

I'm wrong about some of the test currents. I checked math again and the circuit with 5V is putting a max of around 58mA through the resistor under test, with 114mV open-circuit. So this looks quite...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 07-02-2022, 11:56 AM
Replies: 154
Views: 30,995
Posted By redwire
Re: New tool to find short capacitors on motherboards : shorty with display

I think the original circuit does not push much current through the probes?
BC557 switching around 56mA but most of that goes through R2 2Ω which is in parallel with the tested resistance, and by...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-30-2022, 03:37 PM
Replies: 154
Views: 30,995
Posted By redwire
Re: New tool to find short capacitors on motherboards : shorty with display

A one or two transistor constant-current source is not difficult, and possible to voltage-limit it. On laptops, GPU etc. I could see a need to keep it under 2V max.
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