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Old 6th June 2008, 02:25 AM   #111
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Quote:
Originally posted by rfenergy
Do you think a 400VA 25+25 would be even better than a 400VA 22+22 transformer?
It depends on your objectives. 25V will work well with 8ohm loads and chassis that can dissipate heat.

Also, with 25V the sound is more energetic and alive, I personally prefer it this way, but some people OTOH tend to like more soothing presentation, for that, lower supply voltages could be recommended.

Unless you aim to achieve maximum power, 22V is a good overall choice.
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Old 6th June 2008, 04:15 AM   #112
WJMIII is offline WJMIII  United States
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I love the 25V, too - sounds very direct and alive - a TON of excitement for me.

I am so spoiled now! I have a 3886 chipamp I built, one Tim Rawson build, and I just built a UcD 180 with 20 gauge solid copper and silver wire for power and signal. The sound is so up front and exciting vs a typical push/pull amp. I just sold a Jolida eL84 amp because it sounded so wimpy in comparison to these Class D units.

Peter, I am going to have to build one of those briged chipamps you have for a new sub, now!
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Old 6th June 2008, 11:34 AM   #113
Bluto is offline Bluto  United States
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7/10ths -

What did I miss? Can you give me post#?

I very loosely paraphrased to address John's comments, am familiar with tone control section at ESP yet came away with impression that Peters design is not compatible.

I prefer to build it as Peter designed it for 'purity' but if it can be used with tone controls I'd merely want to learn such for future considerations.

Thanks - Bluto
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Old 6th June 2008, 12:31 PM   #114
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Quote:
Originally posted by Bluto
7/10ths -

What did I miss? Can you give me post#?

I very loosely paraphrased to address John's comments, am familiar with tone control section at ESP yet came away with impression that Peters design is not compatible.

I prefer to build it as Peter designed it for 'purity' but if it can be used with tone controls I'd merely want to learn such for future considerations.

Thanks - Bluto
Hi Bluto,

You can use tone controls on most amps, including Peters. It's a matter of personal taste, do you like adding more components in the signal path? They are usually included in the preamp.

regards
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Old 6th June 2008, 01:00 PM   #115
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Thank you to everyone for the input on the transformers.

Does the power difference 25V vs 22V, change the frequency response of the amp?

Or would you say it gives it more "balls" ?

I need as flat a response as possible. I will use one of the amps to power my second set of monitors in my studio which are 8 Ohm, fostex fe167e, the other amp will power a pair of 8 Ohm fostex fe127e which are used for home entertainment/music (my friends home system).

Thank You,

Robert

p.s. sorry for the 20 questions...
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Old 6th June 2008, 02:01 PM   #116
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Here's the graph showing power output for different loads vs supply voltage . Use 1.45 multiplier to convert AC from transformer into DC after rectification and smoothing.

The frequency response should not change.
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Old 6th June 2008, 03:36 PM   #117
rabbitz is offline rabbitz  Australia
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Peter

The supply voltage on that graph..... DC after rectification?
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Old 6th June 2008, 04:03 PM   #118
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Not Peter, But yes.
Supply voltage given as DC.


7/10
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Old 7th June 2008, 02:42 PM   #119
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Peter,

I did not receive any zobel parts, if I wanted to use them what brand and rating do you supply. Where could I buy them?

Thank You,

Robert
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Old 7th June 2008, 03:14 PM   #120
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As mentioned on my website: "Zobel components are not recommended for those kits, but can be included if required."

I only include them, if specifically asked for. It is 0.1uF polypropylene cap from BC Components and 2.7R 2W Panasonic resistor.

Again, those are the values that CarlosFM recommended on a forum. I noticed that in 47Labs Gaincard, 10R ressitor was used instead.
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