March 27, 201313 yr Someone over there uses Tyll's avatar as well... isn't that a picture of him and his test box?
March 27, 201313 yr Someone over there uses Tyll's avatar as well... isn't that a picture of him and his test box? There are a couple of folks using Tyll's avatar. I didn't pick up on it until I saw what looked like tyll replying to himself
April 8, 201313 yr PM lil knight he may still have a set will there be a board run for the newest balanced dynahi + PSU?
April 8, 201313 yr PM lil knight he may still have a set I think he's looking for the up and coming board that's still being worked on...
April 15, 201313 yr oh, yeah I see it now. So the difference it the output transitors and onboard heatsinks? Edited April 15, 201313 yr by sbelyo
April 22, 201313 yr Not much left on the boards... Waiting for some SAND from bdent... Somehow missed to order: Electrolytics 3 big and 3 small on the DynaPSU x 2 470 uF/35V on the DynaHi. I installed 470 uF/63V which I had ordered wrong. Shouldn't be a problem I guess. Waste of cash... But hey. At least they're put to use. So 6 extra... 2 different bridge rectifiers on the DynaPSU x 2 1MOhm-resistors... 4 x 10 kOhm trim pots x 2 on the DynaHi x 2; Anyone have a part no for the vertical ones? I somehow ordered the horizontal one... Film cap (WIMA) on the DynaHi x 2 And I need to figure out what 20 KLO and KDT are... Dual Tracking? I thought they were resistors and stuffed wrong... Edited April 22, 201313 yr by Valentin Hogea
April 22, 201313 yr Hmm, you don't have to populate the 3.3v 5v 12v section of the Dynahi PSU if you are using that Alpha pot... That section is left for one who wants to use KG's digital attenuator.
April 22, 201313 yr Ok... KG's digital attenuator sounds interesting... Tell me more As in remote control compatible? Because I plan to use the Dynahi as a high-efficiency speaker amp too (for bookshelf speakers). /V
April 22, 201313 yr Also, for the KGSSHV are you planning on a two case design? because you can't mount the 10m90s like that with the 3U case. Digital attenuator doesn't cost that much more compared to what you've already spent... about additional $200. I would go that route. Should provide superior sound and much more refined attenuation. Your progress is much faster than mine.... I haven't touched mine for a month... I've just been enjoying the KGSSHV...Ay, I really need to get off my lazy butt and get going. Edit: to just posted: You probably can't get the KG attenuator anymore... because there was only one run and that was long ago.. I haven't seen a populated or unpopulated board go up for sale for a long time. However, the AMB R-2R digital attenuator uses the exact same chipset and same voltage as the KG attenuator. This only difference is the Relay voltage. You can also use their LCDuino controller. I'm sure you can fit it in there. Edited April 22, 201313 yr by jwzhan
April 22, 201313 yr What I don't like of amb's Delta1 are its rather large size and having to stick with the ugly LCD screen...
April 30, 201313 yr Hi guys! Need some advice on 2 caps for the DynaHi-boards... 1st] WIMA (most likely) film caps 0,47 uF. 1 per board. What voltage rating and tolerance? 2nd] 0.1 uF film cap2 per board. What voltage rating and tolerance? And a secong thing... The bridge 512-KBL02 is obsolete. Any tips on a replacement? --- Also, for the KGSSHV are you planning on a two case design? because you can't mount the 10m90s like that with the 3U case. Digital attenuator doesn't cost that much more compared to what you've already spent... about additional $200. I would go that route. Should provide superior sound and much more refined attenuation. Your progress is much faster than mine.... I haven't touched mine for a month... I've just been enjoying the KGSSHV...Ay, I really need to get off my lazy butt and get going. Edit: to just posted: You probably can't get the KG attenuator anymore... because there was only one run and that was long ago.. I haven't seen a populated or unpopulated board go up for sale for a long time. However, the AMB R-2R digital attenuator uses the exact same chipset and same voltage as the KG attenuator. This only difference is the Relay voltage. You can also use their LCDuino controller. I'm sure you can fit it in there. Why can't I mount them like that with a 3U-case? I've seen several other builds like that? Please explain as I'm a novice. Regarding the KG Attenuator, some resurrected interest in making new boards might have appeared. Check the thread and show interest if interested... --- I'm thinking of doing a 5U Dynahi/DynaPSU-build with the boards stacked on each other with 80-90 mm screws between the boards like this:
April 30, 201313 yr Look for some Wima MKS2 63v. Tolerance 5-10% is fine. When you click on Show similar, Mouser will show you parts that are closely matched the obsolete one. Just start from there.
April 30, 201313 yr As to why that type of mounting won't work for KGSSHV, the amp boards just doesn't leave enough clearance room for the PSU, and you can't really mount the amp boards above the PSU without drilling holes on the PSU board for support stand-offs. It might work for the dynahi. The heatsinks are going to be warm though, because they are dissipating (should be) some 30+ watt of heat each at all times. You can play around with it, and maybe it will even work for the KGSSHV.. but mounting like this becomes really annoying when you have to troubleshoot the one on the bottom...
May 24, 201313 yr yep, I'm pretty sure the 1N4007 diode silkscreen is flipped. I just made a LTSpice file for the PSU, and it's giving me -0.8V for the negative rail with flipped 1N4007 diode which is consistent with what I got this morning. So if you are using v0.2 board... remember to flip it back. Also, the silkscreen for the on-board heatsink version is also flipped. No idea how I didn't spot that before.... Edited May 25, 201313 yr by jwzhan
May 28, 201313 yr After reversing the diode, the PSU powered up to ±30V flawlessly. I didn't use the dual track, but the negative rail and positive rail was only different by 0.01V (+30.19V and - 30.18V.) I'm not sure that dual track will make much of a difference.
June 18, 201313 yr I am ordering some prototype boards this weekend. Let me know if you want to be a genuine pig. Only the amp board though, I have some S22 that can do the power work. Before doing that, would appreciate any clear eye to check for error(s). http://gilmore.chem.northwestern.edu/dynahibal8.jpg
June 18, 201313 yr Hey I am all in for smaller version. Still not sure if the boards could fit my chassis... What film caps are you mentioning? In the amp or psu?
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