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Old 21st October 2010, 02:24 PM   #1281
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Hello all

Iam finally starting my first gainclone diy project, actually, my first diy project at all. Iam gonna build a integrated dual mono gainclone based on Peter's premium LM 3875 premium kit. To make it more interesting, it will have a digital optical input for my tuner and a build-in Ipod docking station for my ...eeerrr... Iphone. For the digital input I have in mind the AMB Y1. For the docking station a standard apple docking thingie. Those two need power as wel obviously. Should this affect my choice of transformers? Having a polish girlfriend, I was planning to go with peter's suggestion of two polish
TS300VA PRI:115V SEC:2x22V for AUDIO (no idea why that got so big)
from the Polish Special for audio torroid builders.

Anyway: same transformers? (Iam going to figure out later how to get that power from it, first things first, step by step)

Suggestions anyone? (maybe even for coice of digital input / docking station)

Kind regards

Erik
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Old 21st October 2010, 02:53 PM   #1282
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I would add windings on those transformers for any additional circuits. That's what I did with an amp having built in DAC: AudioSector-chip amp kits, dacs, chassis
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Old 21st October 2010, 03:07 PM   #1283
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Default thum when powering off

Hi all
I have this 'thum' sound when powering off my gain clone (Peter's gainclone). Will it destroy the speaker in long run?
Thanks
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Old 21st October 2010, 03:13 PM   #1284
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Did you check DC offset? Normally, the amp does not produce any thump. There must be something wrong with your setup.
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Old 21st October 2010, 03:21 PM   #1285
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Yes, the dc offset is about 82mv. The 'thump' is when switching off, not when switching on.
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Old 21st October 2010, 03:59 PM   #1286
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82mV is normal, do you get a thump when no source is connected and volume is down?
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Old 22nd October 2010, 12:51 AM   #1287
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I just checked. Yes, a bigger 'thump', even when switching 'on' as well. And while the cable is unattached to the gainclone, the buzzing sound returns. I thought it (the buzzing sound problem) was solved. This really surprised me. If the preamp is connected to the gainclone, no buzz, only minor hum from transformer and after about 20 minutes or so, the hum is not audible, unless you focus your attention and get very very close to it. What would be causing this? Thanks for help.
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Old 22nd October 2010, 12:53 AM   #1288
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The cable needs to be attached to the amp, otherwise the buzzing is normal.
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Old 22nd October 2010, 01:02 AM   #1289
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Oh...ok. I connect the preamp cable back and without turning on the preamp, the 'thump' is still there when I switch off the gainclone. It's been like this all the while and I thoughtit was normal. My diy Aleph5 has this problem and forum members said it was normal.
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Old 22nd October 2010, 01:46 AM   #1290
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It isn't normal with GC and shouldn't be happening with Aleph 5 neither. However, it may be hard to find what's causing this.
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