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Overunity Machines Forum



Anyone try this for a JT?

Started by Legalizeshemp420, October 01, 2013, 10:29:34 PM

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0 Members and 2 Guests are viewing this topic.

Legalizeshemp420

Quote from: TinselKoala on October 02, 2013, 12:10:41 AM
You can get adapter boards for the devices, but mounting the device to the adapter board can be tricky, unless you use solder paste and hot air or an oven.
http://www.proto-advantage.com/store/index.php?cPath=2200&gclid=CJWSr-Gi97kCFepZ7AodVzwAiA
http://www.proto-advantage.com/store/icsoldering.php
A long time ago, when SMT just came out, I swear I saw an adapter that would turn SMT into through hole.  Some where with a door type mechanism like you see on a CPU that clamps it down and on the other side were the pins.  I just wish they still made those since no soldering is needed and you could easily remove and try another at your leisure.

I don't have the space, patience, hot air machine, or the magnifier scope needed to do SMT else I would be using them for most applications.

Pirate88179

I use a regular soldering iron.  This surface mount transistor is not really all that small like all the other smt devices I have seen. (or tried to see)  I do use a magnifying lamp to solder with but that is because my eyes are not that good anymore and my last pair of glasses I got 20 years ago are not doing the job these days.  Using a small heat sink, it is easy to solder 22ga. wire to this trans. for through hole mounting.  I would post a photo of one with that but it is late and I work in the a.m.

Try your transistor and see what it does.  Not everyone here has the same goals for a JT. My goals are to have a lot of light on a single "dead" AA and have it run down as low as possible.  I have been doing pretty good at this using high voltage/high frequency and can light 400 leds drawing 250 mA's.  I can also light a 60 watt equiv. Cree LED bulb (gutted) at about 210 mA's.  It is a work in progress for me but I have had many failures of late.  Oh well, failure is when we learn right?

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

Legalizeshemp420

Quote from: Pirate88179 on October 02, 2013, 12:44:36 AM
I use a regular soldering iron.  This surface mount transistor is not really all that small like all the other smt devices I have seen. (or tried to see)  I do use a magnifying lamp to solder with but that is because my eyes are not that good anymore and my last pair of glasses I got 20 years ago are not doing the job these days.  Using a small heat sink, it is easy to solder 22ga. wire to this trans. for through hole mounting.  I would post a photo of one with that but it is late and I work in the a.m.

Try your transistor and see what it does.  Not everyone here has the same goals for a JT. My goals are to have a lot of light on a single "dead" AA and have it run down as low as possible.  I have been doing pretty good at this using high voltage/high frequency and can light 400 leds drawing 250 mA's.  I can also light a 60 watt equiv. Cree LED bulb (gutted) at about 210 mA's.  It is a work in progress for me but I have had many failures of late.  Oh well, failure is when we learn right?

Bill
That is my goal as well but my goal is diverging for the last few days after I made the mods to Lidmotor's Penny circuit.

My eyes started to go about 2 or 3 years ago and before that I had 20/12 vision (what people could see at 20 feet I could at 12).

I use a pair of 3.0 glasses from the dollar tree to see with when working with the parts as it frees my hands for soldering.

e2matrix

Not sure anyone answered your question about the transistor in the OP but it seems to me it might have too low of voltage capabilities, i.e. it would likely be easy to fry it in a JT.   I'm no expert on reading datasheets but that's what I got out of looking at it as I think the JT can create some high spikes.     

crowclaw

Just a quick word regarding SMT devices to any one likely to be put off using them within their projects. It's really down to practice, using a narrow pencil bit and liquid flux and you can quickly master removal and replacement. Copper strip board (Veroboard) is easy to mount SMT's directly onto the strips or even the perf board that Pirate uses for his work. A real of solder wick is useful for moping up excess solder or shorts. I also use a hot air propane gas pencil for removing certain parts, but most items including chips can be removed with just an iron with practice. There's plenty of scrap circuit boards assigned to dumps with a wealth of goodies for practicing on. So don't be put off guy's...most of my projects are now made up of a fare mix of SMT and conventional components. Furthermore circuitry becomes more compact, have fun. Crow