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Old 28th November 2014, 06:46 AM   #1
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Default Papa Nelson Big Mu Amp

Hi Everyone,
I need some help about this schematic,
Its Papa Nelson offer for someone a few month ago but there is no update or interest about it
and before someone kill me here a few reason why I want to build this amp :
1. I need an amp for 2 X 10" (RCF L10-750YK) with @ 350w so total 700w RMS
2. There is a tons IRF610, IRF9610 anf FQA62N25 pull out from old SMPS with very low prices (enough deal with fakes parts from CxxxxA)
3. I already have 3KVA Toroidal with 65-0-65 Voltage with 4 pcs 10000uf/100V capacitor
I will try to simulated the schematic use LT spice but before do it may be some one can give me a clue about a few thing, especially about how to adjust the bias, stability issue if any.
any help will very apreciated
Thank You
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File Type: gif MU MONSTER.gif (335.1 KB, 415 views)
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Old 28th November 2014, 05:46 PM   #2
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With that transformer, the rails will be about 90V or so.

The circuit will scale down without difficulty, but you want to think about
what power devices you would use. If you choose the devices listed
then probably would think in terms of 5 output pair.

Keep in mind that the resistor values and such are nominal, and some
tweaking would be appropriate.

Also keep in mind, this is not a project for someone without experience
building dangerously high power amplifiers.

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Old 29th November 2014, 12:15 AM   #3
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Quote:
Originally Posted by Nelson Pass View Post
With that transformer, the rails will be about 90V or so.

The circuit will scale down without difficulty, but you want to think about
what power devices you would use. If you choose the devices listed
then probably would think in terms of 5 output pair.

Keep in mind that the resistor values and such are nominal, and some
tweaking would be appropriate.

Also keep in mind, this is not a project for someone without experience
building dangerously high power amplifiers.

Thank You Papa,
about the device I not worry at all with 1 USD for 10pcs I dont mind to put at least 20 pair, at least I will try to simulated the front end first.
off course very few people has knowledge and experience like you in build high power amp thats why I ask for advice.
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Old 29th November 2014, 12:50 AM   #4
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With FQA62N25, you should be happy with the existing schematic for outputs.

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