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Chip Amps Amplifiers based on integrated circuits

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Old 15th April 2003, 06:45 PM   #11
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Rarkov....great Job Lad on the amps!!!!.....you should put up some interior shots on your site also

Cheers!!The DIRT®
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Old 15th April 2003, 08:25 PM   #12
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Default Pragmatic HiFi

I love the look of your system. This no nonsense approach is quite appealing. I was wondering if you could give us some more details on the total your total project costs. (just roughly, sans development and failed components would be OK)

Looking forward to more pictures.
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Old 15th April 2003, 08:25 PM   #13
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why have a preamp?

i cant wait to see some internal pics.

ahh, Da5id4Vz just posted that the same second!
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Old 16th April 2003, 02:59 PM   #14
Rarkov is offline Rarkov  England
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Hi,
Thanks for your kind comments. I have the rest of the pics but haven't uploaded them yet...This weekend - I promise!

For now - here is a price list for you all...

The preamp is there to change the volume and select on of the 5 inputs.

Thanks,
Gaz
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Old 16th April 2003, 03:29 PM   #15
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Quote:
Originally posted by Rarkov
The preamp is there to change the volume and select on of the 5 inputs.

oh, i wondered where the volume controls were.
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Old 16th April 2003, 04:13 PM   #16
Nuuk is offline Nuuk  United Kingdom
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Quote:
3 Pole Locking Connectors
Not mains earthing the amp cases then?

What cases are you using that cost £4.00 and where are they from?
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Old 16th April 2003, 09:47 PM   #17
Rarkov is offline Rarkov  England
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Hi,
No - nothing is Earthed...
I know it's a safty aspect - but since I don't know earthing regulations very well - I'd probably make them more unsafe. Besides, there isn't that much opertunity to hurt yourself on these!

The cases are from Maplins. The manufacturers code is AB13. If you intend on putting a PSU in these - watch out 'cause they are VERY tight. My PSU is literally bulging at the sides!

Gaz
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Old 17th April 2003, 03:38 AM   #18
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Thanks for posting the parts budget. I think its great to see what can be done with some care and good design sensibilities.

Ive been surprised at how much interest the project boxes have created.

The reason I asked is because its exciting to see that what must be a great sounding system built for not a lot of money.

I think that your system bundled as parts and plans would make a great first audio kit for a lot of people.

Thanks for sharing.

Has anyone asked if you can post pictures of the insides?
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Old 17th April 2003, 07:35 AM   #19
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Quote:
No - nothing is Earthed...
I know it's a safty aspect - but since I don't know earthing regulations very well - I'd probably make them more unsafe. Besides, there isn't that much opertunity to hurt yourself on these!
Gaz, it's a long shot I agree but not out of the question to get a short between the primary and secondary windings on a transformer and then you could get 240 volts into your amp cases!

The earthing isn't difficult to get right. The earth wire from the mains lead is connected to the PSU case. Connect the earth wire from the transformer and the wire that goes to the amplifier at the same place.

In the amplifier, connect the earth wire to the case and connect that point to the power star point with a 100R resistor with a 22n capacitor in parallel.

I've ordered the AB15 cases from Maplins for my PSU's but am still waiting for them to arrive. The AB13 would be too tight for my transformers.
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Old 17th April 2003, 07:37 AM   #20
Rarkov is offline Rarkov  England
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Hi,

Yes the request has been placed! It is a bank holiday in the UK tomorrow - so I'll probably post the internal pics then. They're not /that/ neat. I've used this range of cases for a whole host of projects including preamps, this system, wallin jig etc etc.

Once again - thanks for your replies...
Gaz
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