Author Archives: Jim

Hacking reading glasses

This is part of the post-cataract adaptation saga.  I had a Technis Symfony toric IOL put in my left eye 4 days ago as the first of 2 cataract surgeries.  While I have concerns, I can certainly see better than … Continue reading

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Repair of Keith Rubow RF Remote transmitter

This (~12/11/17) is the fourth repair of this device – I can’t believe I didn’t record the others.  The $75 device is a 6 button “garage door opener” and USB receiver designed to control music playback software for “tape group” … Continue reading

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Trivial zero clearance table hack for belt sander

I’ve lost a couple of small pieces to the innards of the belt sander by having them sucked down between the belt and the table.  Inspired by various zero clearance inserts/whatever from Matthias and Jimmy DiResta, it occurred to me … Continue reading

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Audible DIScontinuity tester

Sometimes I’m trying to check a cable – often a thin audio coax – for an intermittent open.  I could hook an audible continuity tester to it and listen for the noise to stop momentarily, but a less annoying and … Continue reading

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Class D amp lockup

The very nice class D amp I use for driving speakers for basement square dances has locked up a couple of times, with the worst at Crown Point during C2 lessons with the terrible Moger recordings.  It’s happened once or … Continue reading

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Drawbot stepper torque measurement

To measure holding torque on the old Science Center steppers, I attached an aluminum arm to one of the drums, keeping it as close to where the bobbin was epoxied to the shaft’s gear as I could.  I notched the … Continue reading

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Dangerous barrel connectors or
Why the cost of the Drawbot just jumped $200

Not all coaxial barrel connectors are created equal.  The male on the top is the one that was on the 30V drawbot stepper power supply before it blew up my new laptop.  The yellow one is what’s on that supply … Continue reading

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Drawbot string plotter

The Drawbot, a ‘polargraph’ 2-string plotter inspired as a junkbox project by Bill Paulson at Workshop 88 in April of 2013, has been under on and off development and improvement ever since. While there are still a couple of upgrades … Continue reading

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Fridge water leaks and stuff

We’ve had a lot of instances of water leaking into the basement from the fridge.  This details the latest instance, with what I can recall of others.  All the problems could be stopped dead by disconnecting the water line that … Continue reading

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Basement Watchdog Big Dog transformer failure

We got home from Heartland 10/15/17 to BWD beeping.  When I went down to look at it, I saw the red LED for Power Failure on, but my first goal was to stop the damn beeping.  Unfortunately, the alarm wouldn’t … Continue reading

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