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Old 17th November 2008, 03:01 PM   #311
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I would say 100VA would be minimum, and I normally use 300VA toroids. As to the voltage, 15-25V AC (dual secondaries or centertapped)
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Old 25th November 2008, 09:48 PM   #312
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Just received your kit today. It's all soldered already. Now the transformer (ILP)
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Old 30th November 2008, 10:58 PM   #313
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I thought it may be a good idea to post a link here to a place in Poland that produces affordable and very good transformers: http://www.toroidy.pl/index.php?page...emart&Itemid=2

Ask for a special audio version:

TS300VA PRI:115V SEC:2x22V for AUDIO:
- secondary at the core with 50% higher diameter, single wire (1,8mm)


I used such transformer in my best amp yet: The most advanced GainClone amp yet althought it was amorphous core, which I hear is not available any longer.
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Old 30th November 2008, 11:08 PM   #314
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Quote:
Originally posted by Peter Daniel
Are you sure you didn't mixed up resistors on amp PCBs?
The values should be according to schematic here: http://www.diyaudio.com/forums/attac...amp=1210693738

I have checked this and it was not the problem. I'm a bit stuck now. I'm considering making up the stereo config as in your pictures. If that works, then I will work backwards (or just leave it as it is...) The ony non standard bit of kit is the LED and RLED which I salvaged from a PC. Can this be jumpered or left out to eliminate it?

Thanks

Matt
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Old 30th November 2008, 11:11 PM   #315
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Don't jumper, just leave out.
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Old 1st December 2008, 11:26 AM   #316
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Hi Peter

do you think that Toroidy transformers build for audio are better than Plitron of such type
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Old 1st December 2008, 03:56 PM   #317
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If they were with amorphous core, they would be better, otherwise, they are certainly comparable.

BTW, I also used those tranformers in my Zv9: Another Zv9 completed
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Old 1st December 2008, 07:10 PM   #318
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thx Peter

very good hint
Is that transformer build for audio use - It Is not encapsulated

I am very sensitive to noise - hate mechanical, buzz that some transformers make

have somebody used www.amplimo.com transformers
are they In relation with Plitron
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Old 2nd December 2008, 05:40 PM   #319
mikje is offline mikje  United States
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Default Subwoofer on my 3875 amp

I just finished a chipamp.com LM3875. Thanks for the coaching and guidance Peter. I'm running a pair of FR Tangband speakers (3CR-Ti on the PE speaker projects page). I'd like to add a sub to get a little more bass. What is the best way to connect the sub to my amp? Is running the sub in parallel with my speakers, off the speaker jacks, the right way?
Thanks.
Mike
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Old 3rd December 2008, 02:12 PM   #320
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Off the speaker jacks for a sub will work.
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