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Old 17th September 2013, 12:47 AM   #1351
flg is offline flg  United States
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Quote:
Originally Posted by wintermute View Post
thanks flg. I have some 1000uF 25V silmic II's and whlst they could be made to "fit" they are off at an angle. and not flush with the board. Was womdering if you ended up going with a lower voltage rating on the caps than the 25V specified in the bom.

I'll probably go with panasonic FM or FR. I've used rubicons in the past for small caps (I think ZA or ZL), they make some super low esr caps! and yes they are the manufacturer who used to make black gates

Tony.
16V 470uF SilmicII
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Old 17th September 2013, 02:56 AM   #1352
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Old 17th September 2013, 10:19 AM   #1353
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I know we had this discussion some time back about thermal drift and dc offset on the BA-3 front end. I was measuring it the other day and it was flickering about certainly not steady. The mosfet heatsinks are the same style as with Nelson's photo but with six fins rated at 6.4c/w. Has anyone found that a bigger heatsink or even one that links the two mosfets works any better at controlling the dc offset or do we just live with it?

Last edited by Backbones; 17th September 2013 at 10:37 AM.
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Old 17th September 2013, 11:03 AM   #1354
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you're having output caps ?

if yes , just chill

if not - heat-spreading them is first improvement
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Old 17th September 2013, 11:23 AM   #1355
bcmbob is offline bcmbob  United States
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To be honest, I have been running the amp without those heatsinks in the burn-in phase. I did check yesterday and I could hold on to them comfortably after hours of play - surprised me.

My plan is to do the same DIY fabrication as used on the F5 PS. It is made with 0.70 mm copper plate (4" X 10" @ $7) from the local hobby/craft store. Once I decide which cap will be used I can make the HS any shape and size needed.
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Old 17th September 2013, 12:10 PM   #1356
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if yes , just chill
I'm chilling
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Old 17th September 2013, 12:14 PM   #1357
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Love that steampunk amp design bcmbob.

My mosfets are running quite hot; better keep an eye on those.

Last edited by Backbones; 17th September 2013 at 12:42 PM.
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Old 18th September 2013, 04:14 PM   #1358
bcmbob is offline bcmbob  United States
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Backbones,

Partsconnexion has a sale on Mundorf AGs so I thought I would try some of your 1000uF Elna Silmic II caps also. What voltage did you use?
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Old 18th September 2013, 07:40 PM   #1359
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They are 25v. You will have to bend the terminals to get them to stand upright on the pcb (see top of page) but I think it is worth it.
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Old 18th September 2013, 07:49 PM   #1360
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Thanks BB
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