Author Archives: Jim

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

Posted in Square dance | Tagged , , | 1 Comment

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

Posted in Drawbot | Tagged , | 1 Comment

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

Posted in Miscellaneous | Tagged , , , | Leave a comment

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

Posted in Drawbot | Tagged , , , , , | Leave a comment

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

Posted in Home Repair | Tagged , , | Leave a comment

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

Posted in Home Repair | Tagged , , , , , | Leave a comment

Shapelock protective case for Laur’s Prius fob

We had a quite unpleasant and mysterious problem with the Prius’ alarm sounding (lights and horn) when we parked in a quiet neighborhood front of some friends’ house.  (For a square dance.)  We got stuff out of the trunk, but … Continue reading

Posted in Miscellaneous, Shapelock stuff | Tagged , , , , , | Leave a comment

Fixing a krubow RF Remote receiver

The USB cable of Les’ RF receiver broke one of its wires to the PCB inside, and resoldering it was difficult/beyond his skill.  He bought a new one (his 3rd!) and brought me the carcass. The cable had pulled out … Continue reading

Posted in Miscellaneous | Tagged , , , , | Leave a comment

Focaccia slicer

Lauren wanted to made sandwiches out of a round focaccia loaf for an unusually long square dance session.  The question was how to slice it in half neatly.  Plan A was to firmly support both ends a long knife horizontally … Continue reading

Posted in Miscellaneous, Uncategorized | Tagged , , , | 2 Comments

Kidde P3010CU false alarm

Our Kidde P3010CU combo smoke/CO detector started to beep and speak “Fire” this morning.  A pretty thorough search of the whole house revealed no smoke, no fire.  Still a little spooked, I considered apologetically calling the fire department, but noting … Continue reading

Posted in Home Repair | Tagged , , , , , , , | Leave a comment