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amariller

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      • Scan View-Master Reels to Digital Video. Its the View-ReMaster!
      • Retro Radio With a Hidden Secret! Old School Style With New School Parts.
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  • Painted Space Shorts

    Ahhh this is so awesome! From one EE (retired … old guys rule, btw 😎) to another you are amazingly creative! I love it and I’m going to do it!I’m curious … did you try different fabrics? I might give it a whirl on some poly running / tennis shorts. Any feedback is appreciated.

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    Sweet! Great job, Dustin! I’ll build this too. Very useful! Thanks for posting!

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      • How to Make an Acoustic Guitar
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    Beautifully done! I love projects like this great job!

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  • Automotive Current Detector

    Phil,I guess what I was getting at with the voltage level idea is that it serves as a broader trouble shooting tool. If you are looking for a broken wire and it’s a go-no/go situation then that’s perfect. I’ve periodically seen circuits that are a bit more hectic. If the circuit goes through a set of relay contacts that are messed-up or going bad (poses a higher resistance than normal) a pure continuity test might not be enough to find it. Having an indication of level can help identify a contact going bad and that may be intermittent. A dirty or corroded plug contact can produce the same symptoms. The LED illumination will be slightly or even notably dimmer in such a case. Hope that helps clarify or maybe just some food for thought. Thanks.

    Concerning the reverse voltage question, depending on the LED you choose the Vmaxr > 14 so you shouldn’t have a problem.

    Right. Assuming there is supposed to be a voltage present in the neutral switch circuit. Same principal. You are simply illuminating an LED w/ a voltage (unless I’ve missed the larger context).The resister serves only to limit current through the LED so you don’t smoke it. Now if you are wanting to find an open circuit that doesn’t have an inherent voltage you’d need to add a battery to your circuit but that would require extra cause as even a small reverse voltage on some circuits such as a mass air flow sensor can be damaging.

    Handy voltage detector but limited in scope. All that tells you is there is “some” levelof voltage present but not how much. The intensity of the LED offers a little more info as a relative indication. It occurred to me that a three-color LED and a little voltage divider circuitry would give you (by the color and degree of illumination) much better picture of the actually voltage of the battery.

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  • Not to mention the filament is indeed a heater which generates the excess electrons needed for tube operation. Heater implies current so the filament would not just create heat but use considerable power as well.

    Seems I couldn’t respond via the link that your response provided. I will be very interested in hearing how your joule thief tests go. Your results will depend on the quality of the circuit you build but it will be better than not having one at all since two AA batteries (3vdc Max) discharged to <1v is close to the best you’ll see going cold turkey. The thief should be able to get you down to <.3 depending on the semiconductors you use but it’ll be good whatever you do. Please do let me know. Your idea of a simple modular plug-in power supply is great. That will solve all the power requirement problems and be very simple to implement. I posted another comment (or attempted to) but it doesn’t look like it made it. Someone suggested you excite the tube filament…

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    Seems I couldn’t respond via the link that your response provided. I will be very interested in hearing how your joule thief tests go. Your results will depend on the quality of the circuit you build but it will be better than not having one at all since two AA batteries (3vdc Max) discharged to <1v is close to the best you’ll see going cold turkey. The thief should be able to get you down to <.3 depending on the semiconductors you use but it’ll be good whatever you do. Please do let me know. Your idea of a simple modular plug-in power supply is great. That will solve all the power requirement problems and be very simple to implement. I posted another comment (or attempted to) but it doesn’t look like it made it. Someone suggested you excite the tube filament for lighting but I’m wondering how well that will work. The filament is a heater and is designed to be energized in order to create the excess electrons required for the tube to operate as designed. As a heater that implies current, maybe a bunch, even close to an amp depending on the tube. Not necessarily a great approach unless you just want to enjoy the tube’s natural glow and you are not concerned about energy consumption nor heat. Either way it’s totally cool. Please let me know what else you might do with this project. I think it is so cool!

    Another thing is to build a little joule thief curcuit. It will increase the battery life. There’s a bunch of simple ones around. Essentially it’s a switching power supply that allows you to us the voltage available below the cutoff of the led which is about .6V. You can take it wayyyy down.

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  • For 30 yrs I've successfully avoided have anymore of those painful cold sores using L-lycine tablets which you can buy anywhere. Walmart. Anywhere. It's a simple nutrition suppliement and is cheap. I first heard about it from a pediatrician when our kids were young to protect them from catching it from us. So when you feel that first tingle that one is coming on, gobble down a few tablets. So the same thing 2-3 times a day for several days amd you'll never have a sore again. The key is to start the nutrient AS SOON as you feel it. If it becomes a sore and breaks the skin it's too late. Gotta get it AS SOON as you first feel the tingle burn thing before it becomes a sore. This does it every time. My siblings and I got them as kids but not for me anymore. Thank you Mr. L-lycine.

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  • Great post. Have tried this technique several times over the last couple of decades with limited success. I'll try it your way next time and see how it goes. I just reverted to one of the online companies where you can design it on their site and they'll send the board to you. A good way to go but it costs a bit. Really liked your post but would like to add a couple things all of us techie types should be careful of. Most importantly is getting chemicals on our skin. Even the finger nail polish remover. Acetone is quickly absorbed and is damaging to the liver. I know everyone ignores that but always wear some type of synthetic gloves when doing that. You'll be grateful you did in 30 yrs! Avoid fumes too as best you can!!! Same goes for the etch. Carful on the skin.Disposal. That's a tric…

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    Great post. Have tried this technique several times over the last couple of decades with limited success. I'll try it your way next time and see how it goes. I just reverted to one of the online companies where you can design it on their site and they'll send the board to you. A good way to go but it costs a bit. Really liked your post but would like to add a couple things all of us techie types should be careful of. Most importantly is getting chemicals on our skin. Even the finger nail polish remover. Acetone is quickly absorbed and is damaging to the liver. I know everyone ignores that but always wear some type of synthetic gloves when doing that. You'll be grateful you did in 30 yrs! Avoid fumes too as best you can!!! Same goes for the etch. Carful on the skin.Disposal. That's a tricky deal and an annoyance. If you can't do it the best way try to heavily dilute it before dumping. We gotta care of our health and the environment!Thx for reading this book. Haha

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  • Great job, Matt! I'm going to keep my eyes open for a busted fridge and make one too!

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  • Pretty cool!I need a simple voltage regulator circuit. Maybe you can help. I have a solar charger for my car cig lighter but it can over voltage. I thought about a 7812 biaed up to 13.2 (car battery charge V) but that's pretty sloppy. I need it to regulate then shut off if < min voltage. Got a simply circuit for me? Thx!!

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