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SOHA II Builders Thread - Page 80

post #1186 of 1688
Quote:
Originally Posted by regal View Post
Where the heatsink is soldered to the board, make sure it is an open circuit with the DMM , also make sure that the ground trace is an open circuit to the regulator output.


Edit: better explaination on power rails: put your DMM pos lead on the TB+ the neg on grd and it should not beap as a short (less than 10 ohms), do the same with TL+. My first SOHA I board had a tiny trace of the ground plane connecting TL+ with the ground plain causing it to blow fuses.
MY measurings on TB+ and TL+ to ground seems ok, no short.

I found a short on the output (right) leg of the H- regulator. Is that wrong?
post #1187 of 1688
Quote:
Originally Posted by kjetinho View Post
MY measurings on TB+ and TL+ to ground seems ok, no short.

I found a short on the output (right) leg of the H- regulator. Is that wrong?

Not right, make sure the LM337 tab is an open circuit with respect to the heatsink mounting tab.
post #1188 of 1688
Ok. Ifound a short on both legs of C5P. Is this damadged, maybe?
post #1189 of 1688
I desoldered the C5P, and measured the regulator and C5P again. No shortage. Must have been a solder bridge I could not see. I put C5P on the print again, and there was no short. Thanks for the advice!
post #1190 of 1688
Hey guys I'm just getting started on my build. Quick question: do the BD139 or other PS regulators need heatsink paste applied or will it be OK dry?

TIA!
post #1191 of 1688
I use paste, and the sinks gets quite hot, but I'm not sure if you have to use it.

From one thing to another. I now run my amp on a 500mA fuse, everything seems to be ok.
post #1192 of 1688
A couple more newb questions:

What's the point of those 3 LEDs?

I found a top panel and front panel drilling template but nothing for the rear panel. Do we just "freestyle" the rear panel?


TIA!
post #1193 of 1688
The leds are bling. You can light the tubes and have a pover on led, or let it be..
Yes, freestyle the rear as the sockets are not pcb-mount components,
post #1194 of 1688
Thanks kjetinho.

OK, I'll skip the LED bling.

Does anyone have a pic of how they layed out the rear panel when including a Bantam DAC? The recommended placement of the toroidal requires the AC inlet to be in the middle of the panel. My worry is that this will be too close to the DAC and induce hum/noise. Is it worse having the toroidal PT closer to the PCB so there is room for the AC inlet on the far side of the rear panel? That would keep it another 2 inches away from the audio inputs.
post #1195 of 1688
Quote:
Originally Posted by tubesmuggler View Post
Does anyone have a pic of how they layed out the rear panel when including a Bantam DAC?
I haven't seen a build yet with a Bantam inside, but it wouldn't surprise me if it's been done before. Front panel designer would be my best friend here. Laying it all in there first and then printing out a 1:1 will give you a really nice template to follow for drilling the rear panel (assuming you want to do the drilling yourself).
post #1196 of 1688
Quote:
Originally Posted by tubesmuggler View Post
Thanks kjetinho.

OK, I'll skip the LED bling.

Does anyone have a pic of how they layed out the rear panel when including a Bantam DAC? The recommended placement of the toroidal requires the AC inlet to be in the middle of the panel. My worry is that this will be too close to the DAC and induce hum/noise. Is it worse having the toroidal PT closer to the PCB so there is room for the AC inlet on the far side of the rear panel? That would keep it another 2 inches away from the audio inputs.
Try different orientations before you do the drilling, every "case" is different.
post #1197 of 1688
Hi! What is the height of completed board excluding the tubes?
The radiators are 25mm height (as stated in their datasheet), is that correct?

I want to fit the SOHA II into 38mm (internal) height case with holes for tubes in the cover... Is that possible?



Thanks!
post #1198 of 1688
Quote:
Originally Posted by S3TUP View Post
Hi! What is the height of completed board excluding the tubes?
The radiators are 25mm height (as stated in their datasheet), is that correct?
Height of completed board is 30mm (or at least that's what mine is).
post #1199 of 1688
I'm back... Thanks for your help guys.

I got the upgraded Neutrik headphone jack and I'm trying to get the front panel layed out right for it. It looks to me like the 3-pin connector I soldered onto the board there will be in the way. I assume I can remove that and then wire the Neutrik directly to the PCB?

TIA
post #1200 of 1688
Quote:
Originally Posted by tubesmuggler View Post
I assume I can remove that and then wire the Neutrik directly to the PCB?
Yup, that's totally doable.
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