Reply to post: I've had something similar...

Hell desk to user: 'I know you're wrong. I wrote the software. And the protocol it runs on'

TRT Silver badge

I've had something similar...

with an electrophysiology amplifier that was giving someone some gyp. They'd come to me on a computer issue and seen all the electronics gear on my workbench. "Do you know anything about electronics then? Because we're getting some chronic noise on a pre-amp."

I said I'd take a look and lo, they'd mismatched the impedance on the headstage to the pre-amp and subsequently had the gain right up. I pointed it out and they said they couldn't change the input impedance. "Yes you can", I replied. "No, you can't", they said. "Look... no switch."

I pulled the module and showed them the jumper on the board.

"Yes, you can." And pointed out my initials which were worked into the tracks on part of the PCB.

I had done some improvement work to the company's original pre-amp about 20 years ago, and gave a copy of the design to the company rep next time I saw them. No charge. It was low volume, quite specialised equipment, and what I had done was only a fairly obvious improvement to the common-mode noise rejection circuit which let the user fine-tune the pre-amp to match a particular headstage and correct for notoriously variable experimental set ups, but they incorporated it into the Rev B boards for the next 5-10 years or so. Out of vanity I had arranged the components in the shape of my initials and that found its way into the production model.

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