yabba235 Posted February 7, 2022 Report Share Posted February 7, 2022 30 minutes ago, kevin gilmore said: there is no way this is going to be a diy product. I understand, and when will it be ready to buy? Quote Link to comment Share on other sites More sharing options...
yabba235 Posted February 7, 2022 Report Share Posted February 7, 2022 I have one more, maybe a stupid question - how are these four amplifiers connected - there is no phase inverter there and looking at the pcb I can see that the inputs in the channels are connected (?) - I'm tired of this matter and I can't sleep because of it - can you explain it to me ? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted February 8, 2022 Author Report Share Posted February 8, 2022 well there are 2 ways to do this. instrumentation amp and inverting/non inverting. pick one, they are roughly equivalent. Quote Link to comment Share on other sites More sharing options...
justin Posted February 8, 2022 Report Share Posted February 8, 2022 On 1/13/2022 at 3:49 AM, HVRV said: This is the latest design might look similar to Stax-D10 but the fact is different. Why under cut a supposedly original design by making it look just like the SRM-D10? Seems to show a lack of confidence 1 Quote Link to comment Share on other sites More sharing options...
yabba235 Posted February 9, 2022 Report Share Posted February 9, 2022 I have a certain idea - you could add a direct input for a balanced signal - my qudelix gives 4V rms in this mode - bypassing the potentiometer, which is not of high quality - anyway, it is unnecessary in this configuration because the gain control is taken over by the phone or the qudelix itself (of course it writes about my case) Quote Link to comment Share on other sites More sharing options...
s2030081 Posted February 9, 2022 Report Share Posted February 9, 2022 Maybe a good idea to have a bypass mode just like T8000? Quote Link to comment Share on other sites More sharing options...
yabba235 Posted February 10, 2022 Report Share Posted February 10, 2022 On 2/8/2022 at 8:26 PM, kevin gilmore said: well there are 2 ways to do this. instrumentation amp and inverting/non inverting. pick one, they are roughly equivalent. Nice joke I simulated your schematic in topology from pcb and it does not work in any way - only in single mode, not bridge. And I know it works to you - some "king of magic" I always liked to check the circuit in the simulation before I did something - we have something in common Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted February 10, 2022 Author Report Share Posted February 10, 2022 (edited) if you can't copy it now... Edited February 10, 2022 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
yabba235 Posted February 10, 2022 Report Share Posted February 10, 2022 3 hours ago, kevin gilmore said: if you can't copy it now... Thank's, but my problem is when I connect them single amp like on a kerry pcb together, the simulation does not work. And I can see that it works in real - maybe I'm doing something wrong in the simulation ?? Quote Link to comment Share on other sites More sharing options...
yabba235 Posted February 11, 2022 Report Share Posted February 11, 2022 Now all works - I had a short break with electronics so I was a bit rusty Quote Link to comment Share on other sites More sharing options...
yabba235 Posted June 17, 2022 Report Share Posted June 17, 2022 Born in pain - no semiconductors on the market- but case is here ! Introduction my portable estat with necessary modifications 6 1 Quote Link to comment Share on other sites More sharing options...
usa_love Posted July 17, 2022 Report Share Posted July 17, 2022 On 6/17/2022 at 5:08 PM, yabba235 said: Born in pain - no semiconductors on the market- but case is here ! Introduction my portable estat with necessary modifications looks great what does it have inside and where can I get a similar \ buy? Quote Link to comment Share on other sites More sharing options...
yabba235 Posted July 18, 2022 Report Share Posted July 18, 2022 19 hours ago, selfreserv said: looks great what does it have inside and where can I get a similar \ buy? Inside is Kevin Gilmore estat portable with my modification and you can't buy it - it's d.i.y. Quote Link to comment Share on other sites More sharing options...
usa_love Posted July 20, 2022 Report Share Posted July 20, 2022 On 7/18/2022 at 4:11 PM, yabba235 said: can't buy it - it's d.i.y. can someone make something similar to order seems for kse it`s with lowered the bias voltage to 200v Quote Link to comment Share on other sites More sharing options...
Inu Posted August 5, 2022 Report Share Posted August 5, 2022 Made with double sided bread board. HVPS (LT8365) are on the way from JPN. I planning to divide it into four and stack these in 2 or 4 layers, but I don't think it will be a size that can be called "portable" but I will try... 6 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted August 5, 2022 Report Share Posted August 5, 2022 Lovely – smds on breadboard. Excited to see lt8365 on a similar board. Quote Link to comment Share on other sites More sharing options...
yabba235 Posted August 5, 2022 Report Share Posted August 5, 2022 14 hours ago, Inu said: Made with double sided bread board. HVPS (LT8365) are on the way from JPN. I planning to divide it into four and stack these in 2 or 4 layers, but I don't think it will be a size that can be called "portable" but I will try... As for your pcb board: You have big cohones, dude !! BTW: Can you share the source of lt8365 chips in japan ? - I can order them there because only this is what I still need to finish the project. Quote Link to comment Share on other sites More sharing options...
Inu Posted August 5, 2022 Report Share Posted August 5, 2022 I also searched for the LT8365 but couldn't find a way to buy it as a part. I can't wait until next year, so It's expensive, but I bought modules (boards). This is up to + or -280V, so I need to make few changes. https://strawberry-linux.com/catalog/items?code=18365 This shop doesn't have an option to ship to the US, so I got help from a friend in JPN. Quote Link to comment Share on other sites More sharing options...
yabba235 Posted August 5, 2022 Report Share Posted August 5, 2022 54 minutes ago, Inu said: I also searched for the LT8365 but couldn't find a way to buy it as a part. I can't wait until next year, so It's expensive, but I bought modules (boards). This is up to + or -280V, so I need to make few changes. https://strawberry-linux.com/catalog/items?code=18365 This shop doesn't have an option to ship to the US, so I got help from a friend in JPN. Can you have contact with him? I am also happy to buy these modules. I found them myself a few months ago ( find my post on diyaudio forum) but I have no friends in Japan. Without these chips I will not finish this amplifier. Quote Link to comment Share on other sites More sharing options...
s2030081 Posted August 7, 2022 Report Share Posted August 7, 2022 On 8/6/2022 at 2:32 AM, yabba235 said: Can you have contact with him? I am also happy to buy these modules. I found them myself a few months ago ( find my post on diyaudio forum) but I have no friends in Japan. Without these chips I will not finish this amplifier. Maybe you can try to use parcel forwarding service. I am not living in US so I don't know which provider is better. Quote Link to comment Share on other sites More sharing options...
Inu Posted August 8, 2022 Report Share Posted August 8, 2022 Can you send me a PM? Quote Link to comment Share on other sites More sharing options...
usa_love Posted November 10, 2022 Report Share Posted November 10, 2022 On 7/18/2022 at 4:11 PM, yabba235 said: with my modification hi @yabba235 i want to build the same one for my kse except bias 200 v - did you make any other modifications? Quote Link to comment Share on other sites More sharing options...
yabba235 Posted November 14, 2022 Report Share Posted November 14, 2022 (edited) On 11/10/2022 at 10:30 PM, selfreserv said: hi @yabba235 i want to build the same one for my kse except bias 200 v - did you make any other modifications? Only a few: bias voltage selection, input selection ( bal/unbal) and power on/off. The first two are implemented based on bistable relays - connecting them requires only momentary power consumption - important when powered by batteries. Last is simple monotstabile switch. Because of the relays, the housing is large, but maybe someday I will find smaller relays or think about another solution. (Instead of a discrete stage, I would see a high-voltage OA here :)) Edited November 14, 2022 by yabba235 2 Quote Link to comment Share on other sites More sharing options...
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