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Old 6th October 2004, 12:39 AM   #41
Variac is offline Variac  United States
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HI Brian,

That IS a good looking site!

From experience I can say that it would be nice if you had a third product: Parts for a second bridge. This would be for people that later decide to upgrade to monoblocks, or people that just want to make a power supply for another product. This shouldn't be much bother for you, since you stock all the parts. In fact, it might be better and easier to have this option rather than selling kits in both dual mono and stereo configurations.
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Old 6th October 2004, 12:49 AM   #42
jleaman is offline jleaman  Belgium
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A regulated Psu for the gain clone would be great that sounds great. : O)

Now to find a schematic for a regulator i want to build for my other amps that use 4- plus and 40 neg.. Any one got some links or schematics i can work with ?


Pwease.

J'
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Old 6th October 2004, 01:30 PM   #43
fireman is offline fireman  Canada
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Quote:
Originally posted by rabstg
Yes it will work as designed however I suggest you adjust the regulated voltage to around 30 VDC so the regulator does not have to work too hard.
Hello Troy,

How would I achieve that ? To be honest, I haven't had time to go to National's web site and download the related documents.
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Old 6th October 2004, 01:33 PM   #44
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All the info regarding regulated supplies for GC can be found here: http://www.decdun.fsnet.co.uk/gainclone6.html
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Old 6th October 2004, 10:17 PM   #45
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by rabstg
Jean-Pierre & Peter-

Use the one from Apex.jr and use the LM338 regulator.

I am doing just that for a 5 + 1 amp with 6 torids. All but the sub torid are regulated. Drop the voltage to 30-33 VDC and have a "toite"(please excuse the Austin Powers quote) pwr supply.

As for unregulated, I would do as Peter suggests and try one first.

I wouldn't worry too much about using a transformer with 28.4vac secondaries, as I have a friend using a transformer with 36vac secondaries for his LM3875 chip, and it has been working fine for several months now. It is giving him +/- 48vdc rails. I wouldn't suggest pushing it this far, but 28.4vac should be fine.

Here is his post on the amp:
http://www.diyaudio.com/forums/showt...129#post393129
Notice his disclaimer

--
Brian
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Old 6th October 2004, 11:42 PM   #46
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That info makes me feel more comfortable with my 4 x 0-29V trafos

dave
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Old 7th October 2004, 02:10 AM   #47
jleaman is offline jleaman  Belgium
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I cant wait to start my gain clones.. WOot!! Or have my blue amps in my hands : O )
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Old 7th October 2004, 02:19 AM   #48
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Quote:
Originally posted by JasonL I cant wait to start my gain clones
You already did -- i saw those chips soldered into your red boards

dave
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Old 7th October 2004, 02:20 AM   #49
jleaman is offline jleaman  Belgium
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At least there further than yours.. YOU have s many project but none even started.

But i do admire your Chassis.. i like it.. but MINE are going to be better : O )
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Old 7th October 2004, 02:47 AM   #50
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Quote:
Originally posted by JasonL
At least there further than yours.. YOU have s many project but none even started.

But i do admire your Chassis.. i like it.. but MINE are going to be better
At least i have all the parts to put that one togther... and the chassis is just a found item... this one is gonna be a budget clone -- the goal is 4 -- $25 W channels for $100 CAD.

But yes, little time to work on projects... unlike some with a steady paycheque, i'm scrambling to just keep my nose above the water -- means work, work, work comes 1st.

dave
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