Rael Posted March 22 Report Posted March 22 Hi, Could anybody kindly either provide a link to or supply the Gerbers for the amp and PSU boards? A BOM would be appreciated if there is one available. Regards Rael Quote
15lyl Posted March 23 Report Posted March 23 https://drive.google.com/drive/folders/1r3g2TAtBUaBdiMorTWX7yYgeJ7maQbYW https://drive.google.com/drive/folders/0B7egryukiT7_TFlEQlBRejdVdDQ?resourcekey=0-nGWwBYQ_Uivj-ciBLYMeaA Quote
Shawn Posted April 29 Report Posted April 29 (edited) Time really flies — it's been over 10 years since the KGST first came out. KGST was one of the very first DIY electrostatic amps I ever built, and it's still one of my favorites today. Recently, I noticed that the schematic in the Stax Mafia Google Drive has diverged quite a bit from the latest version of the KGST PCB layout. So, I decided to take this opportunity to redraw the schematic based on the newest KGST layout. Hopefully, this will be useful to anyone who needs a fresh reference. Please double-check the schematic before using it — there might still be mistakes. Component numbers follow the original KGST schematic as much as possible. New parts are numbered sequentially. Changes from the old schematic are marked in red The servo section has been added Obsolete parts like C2240//A1486/2SC1815 have been replaced with currently available ones Attached below is the schematic. Next step: I'm planning to attempt a shrunk-down version of the KGST layout, inspired by @JoaMat great work. KGST_2025.pdf KGST_DN2540_2025.pdf Edited April 30 by Shawn updated for DN2540. 1 Quote
kevin gilmore Posted April 29 Author Report Posted April 29 you forgot the dn2540 cascode on the 10m90s Quote
Shawn Posted April 30 Report Posted April 30 6 hours ago, kevin gilmore said: you forgot the dn2540 cascode on the 10m90s The layout referred to this(kgst-miniv05). Didn`t find the DN2540 in this version. DN2540 version added to the previous post. Q1 (MPSA/W06) can be replaced by 2SC3324. Q4 and Q6 (MPSW/A56) can be replaced by HN4A51. Q5 and Q7 (MPSA/W06) can be replaced by HN4C51. Quote
JoaMat Posted April 30 Report Posted April 30 (edited) Well, I consulted the old KGST folder on my computer and it looks like the first versions of KGST were with uncascoded 10M90S. Here is a picture from the KGST folder. KGST with smd parts, servo and uncascoded 10M90S. The designer is, the one and only@Kerry! See this post. Unfortunately, the pictures are gone. Board size said to be 2" x 4.5" Edited April 30 by JoaMat 2 Quote
spritzer Posted April 30 Report Posted April 30 Yeah, those are the first KGST boards I designed back in the day. 1 Quote
Shawn Posted April 30 Report Posted April 30 4 hours ago, JoaMat said: KGST with smd parts, servo and uncascoded 10M90S. The designer is, the one and only@Kerry! See this post. Unfortunately, the pictures are gone. Board size said to be 2" x 4.5" Funny enough, I was still thinking about how to do the layout just last night—and then today I saw Kerry’s SMD version that Jomat shared. I have to say, it’s a really beautiful layout. I didn’t expect it could be made that compact, really impressive work. I’m planning to make another version inspired by Kerry’s approach. At the same time, I also ordered PCBs based on the old layout to revisit the process I went through back then. 1 hour ago, spritzer said: Yeah, those are the first KGST boards I designed back in the day. Yes, I remembered the one you posted somewhere in this thread. Don`t know if the MPSA06/56 can replace the MPSW06/56 since the power rates are different. Quote
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