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Chip Amps Amplifiers based on integrated circuits

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Old 4th July 2003, 08:06 AM   #11
Nuuk is offline Nuuk  United Kingdom
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Quote:
After I read some of the transformer suggestion, I had a question.
SC - I wouldn't get yourself too confused worrying about such matters but a quick answer is that a transformer designed for use at 230 volts can be used with 115 volts but the output will be half what it is when used with 230 volts. So if that transformer puts out twice as much power as is needed, at 115 volts it will be the right amount.



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and what else do I need if I had LM3875 from samples, that make the digikey parts total around $18. Then I need to pay for the $5 handling, unless I make the total cost at $25. In the partsconnexion side also had the same problem.
Yes, it's always a good idea to make up an order so that you don't pay a minimum order charge or postage. Check my complete parts list to see if you have got everything and if you have, just order a few spare plugs or sockets as they always come in useful.
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Old 5th July 2003, 02:21 AM   #12
S.C is offline S.C  United States
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So far this is my conclusion.
http://us.f1f.yahoofs.com/users/bda2...GgjB_AhOiR7sAr
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Old 5th July 2003, 04:51 AM   #13
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Do you think this will be ok for th pre amp section?
Click the image to open in full size.
from headwize
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Old 5th July 2003, 08:01 AM   #14
Nuuk is offline Nuuk  United Kingdom
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Quote:
Do you think this will be ok for th pre amp section?
Yes, at least to get you going but I would later replace that pot with the stepped attenuator recommended by TL (on my FAQ page) and I presume that the headphone out socket goes to a dedicated headphone amp!

Also there are just two inputs!

Your link isn't working at present so I can't pass comment.
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Old 5th July 2003, 08:29 PM   #15
S.C is offline S.C  United States
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I think this one will work
http://hk.geocities.com/solomon_choi/gcpartlist.txt
I didn't know that cheap yahoo free e-mail can't share file to public, unless you pay for your account.
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Old 5th July 2003, 09:30 PM   #16
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The parts on your list look fine to me. If you put them together carefully, you should have a very good sounding GC.
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Old 6th July 2003, 12:29 AM   #17
S.C is offline S.C  United States
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God ! New Problem !!!!!!!!!!!!!!!
My good uncle hided a lot of old transformers at the garuge ( can't spell ), the square sharped one. There are more then 10 of them. However, they are not marked anything. How can I test thoses?

Second, he gave me a nice Aluminum Case. But I don't know how to mesure the already build in power supply. He kept it well, and it looks pretty good. http://hk.geocities.com/solomon_choi/GC.html

P.S The photos won't avaluable (can't spell again ) under an hour. It is what GeoCities told me.
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Old 6th July 2003, 02:40 AM   #18
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the aluminium box looks good...you can try using that...but it's transformer in side is likely to be too puny to be used for your GC...from the looks of it...it has 110-220V primaries and split or tapped secondaries...I guess the box was used for motor control...as for the "uncle kept some trafos" pproblem...you can get those that look BIG and HEAVY. Inject your mains into it's secondary and measure the output...try to find one that is near to your target range...(18-25V)...
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Old 7th July 2003, 05:00 AM   #19
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Ya! It is a weak transfromer. I had tried all the combination of the output, but I only got one in 24V. Others are 12V, 4.98V...etc. I think I am going to use two of those big old transfromer in a shoe box.
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