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  1. Ed Sowell

    Data wall plate connectors

    When I upgraded my security camera DVR I discovered that the new model does not support a wireless mouse. The problem is the DVR in in the garage while the display is in the adjacent room in the house. Consequently, all connections between the DVR and display must pass through the wall. With...
  2. Ed Sowell

    Have all the UPS makers switched to no consumer battery replacement?

    I've used APC UPS for years and they had the battery behind an easily opened door making battery replacement easy. Suddenly, in about 2019, such units seem to have been "upgraded" to "no serviceable parts inside." Although there are independent online videos shoring how to do get the case open...
  3. Ed Sowell

    Wiring common ground for 7 components on enclosure lid

    My Arduino project has 7 buttons and 2 LEDs mounted on the lid of my 3 1/4" by 4 1/2" aluminum box. I'd like to minimize the number of connections to the box mounted circuit board. Each of these components requires its own 5v connection, but I would like to wire all 7 grounds to a single wire...
  4. Ed Sowell

    Rain gauge resetter

    I have an Oregon Scientific wireless rain gauge. An irritating "feature" is battery replacement causes the history to be cleared. If that happens during the rainy season I have to write down the current total and manually add it to all future readings. It would be nice to have a little box with...
  5. Ed Sowell

    Extending output cable of auto battery charger/maintainer

    I have a Schumacher SE-5212A-CA battery charger/maintainer with 14AWG DC output cable. To reach the battery while in the car from the charger on a shelf on the adjacent wall, I need to extend the cable about 3 feet. I'd either splice or replace with a longer cable. I'm concerned that this might...
  6. Ed Sowell

    Proximity sensor for parking

    I have to park my treasured 1976 Jaguar XJ-S as close as possible to the right side of the garage without risk of scraping the car while passing through the door. There are a lot of garage parking sensors, but it seems like they are conceived to keep the car from hitting the wall in front of the...
  7. Ed Sowell

    DVR power supply testing

    This is in regard to a failed Lorex LNR 4082 security camera DVR. One possibility is the power supply. See attached photo. The label says the DC output is either 12v or 52v. I suspect the former is for 120VAC input and the latter for 24VAC input. Don't know for sure. There are lots of YouTube...
  8. Ed Sowell

    Lorex DVR: What is this?

    My Lorex LNR 4082 stopped working. Opening the case revealed a broken heatsink fan, which I replaced. Still no joy. One thought is it's because when the fan failed the chips under the heatsink got fried. Another possibility is the power supply is flakey. So, my first question is what are those...
  9. Ed Sowell

    Proper thermal pad/compound for DVR chip

    I had to get a new fan for my Lorex DVR. the OE heat sink was set with a 25x25x1 thermal pad. I've read that a thermal compound is better that the pads, and I always us it when building a new desktop. What concerns me with using it instead of a pad is the DVR chip looks quite different than the...
  10. Ed Sowell

    Optical triggertesting

    I have an aftermarket electronic ignition system in my '76 Jaguar XJ-S. It uses an optical trigger over the edge of a slotted shutter disk in the distributor. The car recently died and I traced the problem the ignition, and a tests on the oil and the electronic control module showed them to be...
  11. Ed Sowell

    Repair delaminated flex circuit

    The photo shows a flex circuit on the instrument cluster from a 70s era Jaguar XJ-S. This one is from a junk yard and I'm hoping to use in on my own XJ-S. As seen in the photo, there are a few places where delamination has occurred. The conduction paths seem to be OK. So my question is what...
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