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one question - can anybody push the upper "cylinder" on 2n3055 ??? because i can and i think that was impossible with other TO3 transistors...
i can push it downward maybe 2-3 mm ... with su169 i was cooling it that on upper cylinder was a iron strip and pushing it more to cooler, and it was never any sign of pushing on transistor when i removed it.
//i know that heatsink is on bottom, i was just using bar so transisor could be strongly mounted to cooler
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The upper metal "dome" on TO3 is not really meant to be "pushed", and the transistor is meant to be heatsinked on the bottom metal plate with the screw holes in it. The dome is not enough thermally conductive for connecting to a heatsink.
Registered Member #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
Cool! I imagine this has been asked already, but does this work w/ modern flybacks? I wanna make sparks with this thing while I'm waiting for my 555 Driver parts to come in. Would the parts for this be available at Radioshack?
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
As many people have commented, you should be able to lash a bunch of parts together from the monitor board. I know thats where all the parts I used for my second one came from.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
By "modern" I assume you mean those without a rectifier. Absolutely; it's works just fine. There are perhaps significant initial performance differences between the most basic original design of LOPT and the most common today - but you may find that the "modern" common ones often preform with differing & longer arcs! The issue is what use you are to put them to after you get them running. That's where the "older" type has some flexibility.
Firefox's idea is (IMO) the best way to go. You will learn and have on hand some of the most useful parts for this hobby. I continually tear into a varied collection of old items and now have a collection of materials that would actually cost several thousand dollars if I were to have bought them.
This hobby is actually FREE! If you continually look for the "sources", you'll have more than enough to have fun for years. Somewhere on the Forum, someone composed a list of sources existing of thrown away items and at last count there was over 20 pieces of "junk" that would give you everything that Radio Shack could never provide.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
With my original driver and AC transformer I got something like 20KV (sparks igniting at 2cm), the modern potted transformers have usually 2x or more turns than the "old" type, so I can imagine 40+KV could be possible with this driver and some tunning. I actually wanted to try this but I am extremely lazy, maybe in a week or so I'll get to it.
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Improved single transistor flyback driver
