GGW

Excellent post, James - thank you!!

@starcat @Pars - thanks a ton. Immensely helpful as always!

Hi guys, Is the "protect3.zip" the headphone protector gerber that is used in some of the CFA3's posted here? Does anyone have any leads on where I can find out more (Gerbers, BOMs, reading material) on the ZF / SS selector? Thanks!

Thanks, @starcat - very helpful. Do you know where I can find the Gerbers for the ZF/SS selector and the headphone protector?

Ah Awesome! @Kerry @kevin gilmore - what would you gents consider to be the ultimate overkill build for this CFP/A? 4x CFA2 boards or 2x CFA3 boards in 2 separate chassis, with 2 separately enclosed GRLV psu? Or is this new SMD animal you have designed the way to go, assuming the same multiple separate chassis & PSU overkill plan? Separately, I've read the entire thread and can't seem to get my head around the difference between using 4x CFA2 boards or 2x CFA3 boards - are there additional PCBs that need to be printed if I go the 4xCFA2 route (scheming going down this road and 2 dissipante cases such that each pcb has its own heatsink). Or do I just wait and go for the SMD boards you're working on? Many thanks in advance for the help and guidance Cheers

What on earth is this now? Looks epic

Thanks, @jamesmking - very helpful. I've read this entire thread and there are 3 updates to the version .45 board (see file names including the version on the silkscreen, in the snip below): For context, the descriptions Kevin uploaded with each: version 0.46 "rflip" because soren is running the grlv supply at 4.5 amperes, here is a new version with the feedback resistor locations flipped so that the sense is not one inch away from the output connector. sense is now tied directly to the inner power supply connector. So the 20mv change in voltage due to current should be completely canceled out. for higher currents, best if the board is made with 3 oz copper. version 0.47 "rflip to220" here is the version with the to220 sic diodes, someone really needs to check this version 0.48 "largecap" same size board, up to 35mm caps, had to move the pass transistors, needs checking silicon carbide rectifiers 100mm x 109mm I think @Pars mentioned the v0.48 is basically the v.45(?) with fatter, shorter (?) caps for when height is a constraint - is that correct? ******* My questions - (1.) are these all improvements (is version 0.48 the best in all use cases?) or are each of versions 0.46-0.48 just tweaks for specific use cases ? (2.) Which board is best suited to (a.) power the SS Dynalo (mk2 "multiamp"); and (b.) power balanced CFA boards (i.e. 2x CFA2 or 1x CFA3? Many thanks as always for the guidance! (For context - I'm trying to pull the trigger once on a PCB order, so trying to figure out the right versions of all the boards I need to avoid multiple shipping charges... i.e. GRLV, Dynalo, CFA2 or CFA3, etc.)

Hi Gents, 1.) Please could someone point me in the direction of the version .47 of the GRLV board? I can't see it on the share drive 😕 Separately, I have 2 additional questions if anyone could please help me: 2.) What is the latest / greatest / preferred GRLV version for each of the Dynalo and CFA2 x 4 (dual / balanced craziness; or 2 x CFA3 boards) ? 3.) I noticed there is another little PCB called "GR78xx" - would I need to get a few these printed as well? Or is it optional? If optional, what's the benefit? Thanks in advance for the guidance!!

Thank you, Kevin! Indeed that's exactly what I'm after

Can anyone advise on removing the little PCB at the bottom of the kgdynalobal_v9 Gerber file? jlcpcb.com asked me to remove it to avoid errors and I haven't a clue... Is there a version without the little PCB at the bottom?

@Pars you are a champion. Thanks a ton!

Cheers, Pars - will go swim through the Dynalobal gerbers until I find it

Thanks everybody - super helpful! @Pars - how did you hook up the LSK489 / LSJ689's to the THAT340 dip socket? Bending like crazy?

Noob question but do you have to match across N and P channels for the input stage? Or just within N and within P if you go the single JFET route? I.e. if I go for, say, 2 x LSJ74 and 2x LSK170 - do they ALL have to be matched or only the 74s with each other and the 170s with each other? If the latter, then no need to buy plenty LSK489 / LSJ689 and match them? Thanks!

thanks all! Does anyone have gerbers for the little adapter board to make the LS 170/74 JFETs work? And gerber for adapter board for LSK489 / LSJ689 please