Pars
High Rollers
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Everything posted by Pars
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Mini Dynalo After running the amp for over an hour, bias was 14+mA, so right where I want it to be. I thought it might be interesting to create a table or spreadsheet showing different users biasing and results, so I made a Google sheet, here: https://docs.google.com/spreadsheets/d/1D5LDuRdupZRoWR-GfAd03fkFSBAMY4-E_VcYfCAI1Z0/edit?usp=sharing Go ahead and fill in your info if you like so this is available for all to see. Note: this is the first time I've created a Google sheet, so let me know if you can't edit it and I'll try to figure it out Heatsinks: I've been looking for some. The ones that @mypasswordis mentioned from ebay don't seem to be available any more, and I'm having a hard time finding any that appear to be suitable size. There are some I almost pulled the trigger on that were 50mm x 25mm, but the 25mm would leave the end transistors half covered. I could get the Fischer SK81/37.5/SA from TME and cut them in half, but I'm trying to avoid that if possible. I'd need enough for 3 amps. EDIT: Found these, 45 x 35 x 18mm on ebay https://www.ebay.com/itm/263051780518?var=562054192200
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Very sorry Todd, RIP Carol!
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I have some of those as well, from THL audio IIRC. I don't recall any issues with them, other than the ground being a bit of a pain in the ass to solder. I'll check mine, but I've had them a few years now. They do seem to be made pretty well; not as nice as the Cardas rhodium, but a lot more reasonably priced.
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Can you reverse the 2 prong and see what it is like?
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Happy Birthday Steve!
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How deep do you need it? The Slimline comes in up to 350mm deep. The Dissipante (w/heatsinks) comes up to 500mm deep.
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Somewhat ironic user name on that one...
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I wouldn't think so, but you would need to look at the matching on them as far as hFe and possibly Vbe to determine. I would swear that some of the On Semi I've bought recently still had Fairchild markings on it (On Semi bought Fairchild). Are you talking Fairchild 06 and On Semi 56 or a mixture in the same device type(s)?
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I bought a cheapie from ebay for $50 https://www.ebay.com/itm/2-in-1-Soldering-Rework-Stations-SMD-Hot-Air-Iron-Gun-Desoldering-Welder-898D/192010034886?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 Seems OK, haven't tried the iron yet (probably sucks).
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None of that shit is in yet, i was just messing around with doing the voltage switch and having AC relays in for the main transformer. I think I basically did just parallel the 2nd set of primaries with the first, with the relays after that. I realize that when switched to 240V both relay contacts are in series but as far as I could see, that is the only way to do it. Of course I could cheat and use something like a MeanWell for the relay/e24 thingie...
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That looks nice John! Love the base.
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Yeah, I think the fabs try to protect you from your "mistakes", when in this case it is intentional. For your one-offs, do you just do ebay or something? I've bought some machinists tools (used) from ebay with good results (Starrett auto punch, some taps, etc.).
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What set of counterbore bits? I could probably use something like that myself.
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Looks serious, nice copper bar. Did you do all of that metalwork? Sony eh? Very nice!
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Sorry to all injured HCers, and glad you didn't get injured in the fender bender CD44hi! I guess I am at home for a week or so following a strange week and sucky weekend in the hospital. It started out with me noticing double vision when looking left. Woke up on Saturday with double vision everywhere. Went to urgent care, who ran a CT scan which showed nothing. Then to the hospital where I spent Saturday and most of Sunday. Full head MRI there, again, clean. Diagnosed as 3rd cranial nerve palsy by neurologist, confirmed by ophthalmologist today. Should take care of itself in a couple of weeks, maybe less. I guess at my age, what they find in the scans, etc. could always be bad, so counting my blessings there. Heal up HC!
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What 3D package are you doing those in Justin? I was messing around trying to figure out how to do voltage switching with 2 transformers, 1 using a relay to switch on (ala Amb e24), but handling voltage switching for 120/240. Does the below schematic look feasible?
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Sure, I'd be up for that.
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Note that the pinout for the 2SA1349/2SC3381 does not line up with the 2SJ109/2SK389 devices, even though they are the same package. So that adapter will work for the bipolars, but not for the JFETs.
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I’d looked there 2 or more years ago. I’m probably just not remembering it correctly, but it wasn’t an Adcom. Thanks for the suggestion though! Sent from my iPhone using Tapatalk
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Cool, and thanks! Sent from my iPhone using Tapatalk
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No. I'm pretty sure it was Apogee, but it has been awhile. I think I do (or my brother did) have an Adcom around.
