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The Fatigues of Supporting Freedom

The Fatigues of Supporting Freedom

Jun 8, 2017

"Those who expect to reap the blessings of freedom, must, like men, undergo the fatigues of supporting it." – Thomas Paine – (1737 – 1809) Pretty bold quote for a simple blog post documenting my attendance at some recent events. A good food fore thought, or conversation starter though. I would rather be doing any number of thing right now than writing this blog post or attending the events I personally attended documented in this post. However it’s important to all of us citizens, the We The People of our government, spend some of our time researching, thinking for ourselves then discussing and finally voting at the minimum.  That’s the extent of my preaching. Think for yourself, you’re not a lemming. Research and read, consider all sides please don’t blindly follow faith based, or party lines. You could find that although you feel strongly about one thing you might disagree with far more of any organizations views. Think for yourself, be yourself. I attended these events to be counted, and to see for myself the attendance. I had every intention of posting these sooner. I received a bit of extra motivation watching the Live James Comey testimony before Congress. Since a picture is worth a thousand words…    The three events. (Click on thumbnails for larger image) Tax March April 15, 2017   Tom Perez and Bernie Sanders in Mesa April 21, 2017 March For Science April 22, 2017 –...

Shelves on Wheels

Shelves on Wheels

Jan 16, 2016

I scored some used shelving 18” x 36” x 72” for $10 bucks from an onsite auction of a closed furniture store. Space is at a preimum in my house and garage. I wanted to put some wheels on the shelves so I can move them around the garage. Wow they’re on sale for $55 bucks at HomeDepot. (oops online + exorbitant shipping) These are significantly stronger shelves than the plastic and metal ones that are only a few dollars less expensive. I bought a 4×8 sheet of 3/8 inch plywood. Homedepot was kind enough to rip it to my specifications. I bought a dolly on sale at Harbor Freight (HF) for twelve bucks that I salvaged both the casters and carriage bolts and nuts. I want to put wheels on these shelves. I start with a diagram of my idea. It was very helpful in describing the cuts I wanted from the HomeDepot saw cuts. I keep a project journal with graph style pages. Two pieces of 3/8” plywood. The bottom piece is 1” wider on all four sides. This will fit just inside the metal colums of the shelving unit. Clamped for curing over night at least ten hours. I used full tube of “Liquid Nails”   Bummer! Surprised that the liquid nails didn’t hold. Well anyway I’m forging on bolting the casters to the two pieces of plywood.   I clamp a piece of the salvaged HF dolly in place to use as a drill guide for the caster cariage bolts. Casters attached surrounded by the dregs of the salvaged HF dolly. A detail of how the shelving fits snugly over the top piece resting on the bottom. The custom shelving dolly raises the shelves a little less than 4 inches. Looking good. They seem pretty stable. Time will...

Imsai Power Supply Rebuild

Imsai Power Supply Rebuild

Dec 13, 2014

Recently, well once in a while in the last couple years, I’ve had the urge to rebuild some of my old CP/M equipment. Back in the day, the late 70s and early 80s, I ran some California Computer Systems (CCS), CompuPro (aka Godbout and Visan) equipment for a public bulletin board system. Also used these in business mainly for word processing but spread sheets too. I also used my father’s old Imsai S-100 equipment mostly for playing Startrek. I’ve recently been able to boot the CCS and CompuPro systems, however the Imsai was the worse for wear. It blew it’s fuse protection. My house through the years suffered a fire with resultant water damage as well as an ice storm that caused some flooding during the thaw. As you can see in the following pictures the damage isn’t totally catastrophic but significant. I’ve removed the card edge guide rails and the mounting hardware holding the PS-28U unregulated power supply sub assembly to the main chassis. The power supply with capacitors removed.Main frame before cleaning. Interesting, this image from my original Imsai documentation shows what appears to be a half wave rectifier, see heatsync near large capacitors, with two diodes. The image above of my actual board has four diodes. The documentation text does indicate four (4) diodes for a full wave bridge rectifier. Although the water damage, really just some mudding of the dust, was minimal I thought the capacitors may have shorted or leaked, note the white oxide near the connection holes. The diodes near the lower left in this image are two different kinds, the documentation specifics four (4) of the same diodes MOT MR 501. The outer locations CR4 and CR7 are the correct diodes specified while the center two (2) diodes were HEP 7520. Using the diode test setting on my digital VOM I found that the two MR 501s at CR4 and CF7 were shorted. Checking a few substitution charts I came up with a diode I had on hand an IN5408. I replaced all four to have a matched set. Although mechanically very well connected I found two of the diodes in the bridge rectifier with cold solder...

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