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Old 4th May 2010, 05:44 PM   #1411
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Salas

would you advise on audio quality brands resistors for shunts, gate stoppers, audio part
why do we need carbon films for gate stoppers and how much watts
are PRP or RN Dale good enough for both - shunts and audio part
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Old 4th May 2010, 05:49 PM   #1412
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Originally Posted by merlin2069er View Post
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I'm finally done wiring them up. Is it ok to leave AC ground floating or should I tie it down to something.

Thanks,
JG
have you tried F5 without B1
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Old 4th May 2010, 08:26 PM   #1413
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Quote:
Originally Posted by samoloko View Post
have you tried F5 without B1
My F5 is still under construction; I may abandon it if I can't figure out what to do with the heatsinks / case.

I've got the 2 channels and ps board ready. I could use some help with it.

I'm working on a couple of other things I'd like to get out of the way before I tackle the rest of the F5.
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Old 4th May 2010, 08:30 PM   #1414
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Quote:
Originally Posted by william2001 View Post
JG, have you had a chance to listen to it yet? I always enjoy reading subjective opinions.

I've got some parts on the way from Parts Connexion, Vishay MKP-1837's to replace the LED 'lyctics (.2 uF each position), and new PRP resistors (33,33,27) to run the heavy shunt current. Found some thick aluminum bars to replace the puny heatsinks currently in there, hopefully it will be enough. I'm going to yank the Takman carbon films out of the Hypnotize and replace with the PRP metal films, leaving Takman's in the Mesmerize. I can compare one DCB1 with the other just by swapping harnesses inside.
No, I haven't listened to the dcb1 yet. I really need to get a good pair of speakers for 2 channel audio. ( I have speakers for my 5.1 surround sound system).
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Old 4th May 2010, 09:26 PM   #1415
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Quote:
Originally Posted by merlin2069er View Post
My F5 is still under construction; I may abandon it if I can't figure out what to do with the heatsinks / case.

I've got the 2 channels and ps board ready. I could use some help with it.

I'm working on a couple of other things I'd like to get out of the way before I tackle the rest of the F5.
I have been looking at some cases from Antek on eBay...

eBay Stores - Transformers, Enclosures items on eBay.com

One of which looks really interesting...

Power Amp / Amplifier DIY HiFi Case Heatsink Kit - eBay (item 250515881584 end time May-15-10 15:32:11 PDT)

It might be too small for an F5 but I like the integrated heatsinks. The price is not too bad but I would want to be sure it could hold the necessary items.
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Old 4th May 2010, 10:12 PM   #1416
Salas is offline Salas  Greece
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Quote:
Originally Posted by samoloko View Post
Salas

would you advise on audio quality brands resistors for shunts, gate stoppers, audio part
why do we need carbon films for gate stoppers and how much watts
are PRP or RN Dale good enough for both - shunts and audio part
Carbon is generally a better practice for gate stoppers and grid stoppers because they present no resonance dangers with parasitics. In this particular shunt the theoretical phase margin is vast (over 130deg) and normal 1/4W metal film will work too. Still, carbon stoppers are good not only to avoid real oscillations if a design is on the verge, but transiently a preferable measure. Minimum impact in this case though. I don't find subjective influence in the shunt from resistors. Dale and PRP are very good in the audio part, in the shunts part only capacitors matter, and I would save money by using generic resistors in the shunts.
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Old 5th May 2010, 06:09 AM   #1417
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thank you
how Is going with new blue pcb
as you said cap qualities matter - I suppose that you will make 10 mm pitch for big caps like KG Gold Tune
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Old 15th May 2010, 12:40 PM   #1418
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Default Did I get lucky? I feel lucky...

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My local electric service is over the top, literally. The transformer sits at the corner of my yard. I have ~122 VAC. Along with this I am using a "25.2 VCT" transformer. It is pretty generous as well.

I have +/- 14.7 VAC rails going to this. I hoped to be able to "hot rod".

V across R1's are 1.462 & 1.502

The output relay clicks.

DC offset is .001/.003 V

Vout is 9.48 & -9.19

The mosfets are P140 & P9140. I do plan to heatsink them.
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Old 15th May 2010, 01:39 PM   #1419
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Your results look nice Ed, have you heard it already?

Delight us with a close up picture from the board
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Old 15th May 2010, 01:58 PM   #1420
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Samoloko: Yes, there is 10mm pitch in the Blue. We are going for Big Blue (The IBM of buffers?) Tea-Bag is near to order a proto for a check build. The Gerbers print out correctly. Maybe with a bit of a turn we can have the 7.5mm pitch too, if aligned, the pads will almost overlay.

Ed: Nice.
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