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Old 28th June 2005, 05:19 PM   #21
Pasi P is offline Pasi P  Finland
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Bruno,
Thank you very much!
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Old 30th June 2005, 07:52 AM   #22
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Quote:
Originally posted by justcallmefrank
Yay! Modules arrived. Two more questions.

I've always been told that a soldered connection is always going to be better than a "press fit" (?). Is it okay to solder the connections directly to the spade terminals?

Also, which ones are the input coupling caps on the new UcD180 modules?
Bump.
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Old 30th June 2005, 08:01 AM   #23
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The electrical contact between a push-on terminal (faston) and the tab is rather good. They fit very tightly and thus scrape off any oxide layer when making contact. Next comes the connection of the wire to the push-on part. Properly crimped connections are better than soldered. If you do not have a real crimping tool to attach the push-on terminals to the wires, you may elect to solder the wires straight to the faston tabs.

The coupling capacitors are marked C7/C8, and can be recognised because they're mounted to the left and right of the op amp.
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Old 30th June 2005, 01:55 PM   #24
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Thank you kindly :P
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Old 1st July 2005, 03:40 AM   #25
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Just one last question, as the amp is nearly complete. I'm using RCA's, so therefore I should be connecting both the "in-" and "signal ground" to the RCA negative post and "in+" to the RCA positive correct?

Just checking my understanding of the wording on the instructions is correct.
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Old 1st July 2005, 06:34 AM   #26
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Quote:
Originally posted by justcallmefrank
Just one last question, as the amp is nearly complete. I'm using RCA's, so therefore I should be connecting both the "in-" and "signal ground" to the RCA negative post and "in+" to the RCA positive correct?
Correct.
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Old 1st July 2005, 03:05 PM   #27
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A little bit off-topic but,

I need to find a good address in the Netherlands or Belgium for electronics components.

I've found a few companies here in Antwerp, but they are all very unsupportive and order everything straight from Velleman.

This means I'm unable to find 800VA toroidal transformers with 2*42V secondaries. Only 38 and 45.

Any tips for nice HiFi sized casings (+/-43cm wide) would be welcome as well!

Just ordered the HQ PSU from Hypex, now all I need is a good transformer and softstart!
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Old 1st July 2005, 03:23 PM   #28
VT67 is offline VT67  Belgium
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Hi Yves

Amplimo has a 2 x 0-42V transformer at 98,- ex VAT
RS Components has a 2 x 0-40V transformer at 80,- ex VAT
Both are 800VA types.

Regards
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Old 1st July 2005, 03:52 PM   #29
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Yves,

You could also use our 500VA transformer. Ok, 500VA is less as 800VA. Small suggestion go to two 500VA for two true mono block?

Jan-Peter
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Old 1st July 2005, 04:01 PM   #30
greggp is offline greggp  United States
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Obviously, I don't know of anyone in The Netherlands or Belgium, but have you tried Plitron in Toronto, Canada?

They don't have 800VA transformers either, but they can custom build it (might be kind of expensive) or you can purchase their standard 1000VA transformer with output voltage options of 40 V or 45 V. Do you prefer 42 V secondaries because 45 V is too close to the max operating condition for V+/V-?

45 V RMS * 1.414 = 63.63 V peak.
Subtract a volt or so (not sure how much is used here) for the diodes and capacitor discharge and that's what I might expect as a DC output voltage. So a 45 V secondary will give you a peak voltage output of up to 62.6 V. This is very close to max rating of 63 V. However, I've read where the amount of loss from diodes and capacitor discharge can be as high as 4 V.

If you go with 42V, it gives you a peak voltage output of up to 58.38 V. Which is well within the maximum operating condition...
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