cheap testing

Oct 21, 2025 Last reply: 8 months ago 7 Replies

We're testing a proto board. I'm temperature compensating a 50 MHz LC oscillator.



The beer cooler is a great benchtop temperature chamber, for about $35. I didn't have a frequency counter here, so I bought that one from Amazon for $70.



The beer thing heats and cools at about 1.5 deg c per minute, so a temp sweep leaves time to do other things. Kinda like Spice.



The setup really needs the fan inside the cooler.



The window is cool. I can see the LEDs blinking.



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John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics


Ikea should never have stopped making these jerker desks, they are ideal for an office workbench.

Those two oscilloscopes must weigh 100 lbs together. That bench is plenty strong.

But there's something weird about the Ikea varnish that makes most optical mouses not work.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

Ours have a varnish finish. LED-type mice don't work.

There is a Dell laser mouse that works.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

Am 22.10.25 um 16:17 schrieb john larkin:

Lunatic Fringe Electronics

I have built the table in my home lab from 5* IKEA Pronomen wood sheets and a lot of legs, 12 large ones for the L-shaped main table and some short ones to create the 1st and 2nd floor.

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Cheers, Gerhard

But digital scopes are so quantitative. And fast.

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John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

I had these problems as well. The issue is that many things are featureless in the IR or even red, so there is nothing to track or correlate.

What really works are mice with a blue laser.

What has replaced al mice for me is a Lenovo model MB230B.

.

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Joe

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