March 22, 20251 yr 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
March 23, 20251 yr https://drive.google.com/drive/folders/1r3g2TAtBUaBdiMorTWX7yYgeJ7maQbYW https://drive.google.com/drive/folders/0B7egryukiT7_TFlEQlBRejdVdDQ?resourcekey=0-nGWwBYQ_Uivj-ciBLYMeaA
April 29, 20251 yr 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, 20251 yr by Shawn updated for DN2540.
April 30, 20251 yr 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.
April 30, 20251 yr 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, 20251 yr by JoaMat
April 30, 20251 yr 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.
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