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i'm on a roll... the kgsshv

kevin gilmore

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That's looking impressively small. A depth of 4.35 inches implies a horizontal mounting unless on goes for at least a 3U case. But horizonal is probably the easier and better way anyway. 


I like it very  much. 


Does it make sence to use mpsa06 and pzta06 on the same board?


May I also suggest to add descriptions for the trim pots on the silk screen? Makes it easier..

Edited by insanity
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updated the picture, please check against schematic for accuracy.


the board is now 5.65 x 4.35 inches


the idea is to stuff this into the pesante 2U box.


just fits.  With the new power supply 6 x 6.5 inches, 2 amp channels

on one heatsink, and the power supply on the other.

leaves more than 5 inches x 6 inches for the transformer.


now to find some r-core transformers.


single box, all standard parts

Edited by kevin gilmore
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it would be the same number of cables.


both boards would fit on one angle bracket with .5 spacing


final board size 5.45 x 4.2 inches so the boards fit side by side.


here is what it would look like in the Dissipante 02/300N 2U 4mm BLACK

(360mm wide x 300mm deep internal)




for the amp boards, you can lift off the bottom of the chassis by .8 inches

then put the power input block on the bottom of the board. would make

for a very pretty wiring job.

Edited by kevin gilmore
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So you'd want a larger cap?  Why? 


Looks good. I guess I'm not the only one wanting to build this. 


Just out of curiosity. What is the reason why we use 4 separate rectifier diodes instead of one bridge as in the kgst supply?


Because those diodes are SiC and there aren't any SiC bridge rectifiers. 

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fixed everything I know of, same names have a look


also the stax mafia are starting to use these



on the dn2540 and the power diodes


would like to find that part at mouser, but can't yet


(works well on the kgst cascode board)

Edited by kevin gilmore
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I was just thinking about the orientation of the boards in the case. How much heat is generated by the PSU board? Is it similar to 1 amp board or significantly more/less?. From eyeballing it would just fit to put the psu and one amp board on one side and the other amp board on the other side. This would give us more space in the middle/front part of the case. But I don't if this is  a good idea if it results in significantly different temperature of both heatsinks/amp boards. I am dreaming about an rk50 in the middle behind the front panel...


Furthermore I have a question about the shoulder washers used with the bigger ceramic pad for the to247. Which ones do you use? The holes of the bigger ceramic pads are also a bit bigger.

Edited by insanity
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This looks really nice! The main reason to use this over the Carbon servo board from earlier is size, right?

A few small requests for the silkscreen to make it completely self-explanatory:

1. Add voltage ratings for all caps that don't have them (1uF by the servo, 5pF, .47uF at the bottom).

2. Add an OR next to the LSK389/K170 spot, like on the KGST.

3. Labels for the the 100ohm trimpots. Not sure what they do.

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added labels to the silkscreen and updated the zip file


the original board is 6.28 x 3.37 inches  and won't fit in a standard chassis with the power supply


the new board is 5.45 x 4.2 inches


the new layout is much tighter, shorter lengths and the two output sections are absolutely identical.


I have an alternate version of the power supply split into two pieces each 3 x 6.5 inches

so you could mount the power supplies vertically, one per heatsink, and one amp channel

per heatsink

Edited by kevin gilmore
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change the value of the 2 resistors in series  on the other side of the reference.


the 47uf are tantalum capacitors, and 35v is fine. just in case the zener has to go up to 24v

might be a stupid question, but don't you need the 20k resistor to maintain a drop of 10V?  something like (Vcc-10V)/0,5mA = total value of two resistors in series ?

so in case one cannot get the resistor values needed, the 20k can be changed a bit up/down as long as there are 10V across ...right?

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