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Old 28th May 2003, 05:27 PM   #11
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Default TIPxxx?

Not for what he is building............

Jocko
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Old 28th May 2003, 07:16 PM   #12
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Default Re: Ideas for parts in insanely powerful amp?

Quote:
Originally posted by Duo
ZN2000 = 1000 X 2 @ 4ohms / 2000W X 1 @4ohms
If you're bridging those two channels, you should get 4,000 watts, not 2,000 watts.

Quote:
I would like some ideas as to good output transistors to use in these amplifiers.
We're using the Motorola MJL3281A (NPN) and MJL1302A (PNP) in the InnerSound Kilowatt Monobloc (1,000 into 8, 2,000 into 4). DigiKey's selling the Toshiba equivalents (2SC3281 and 2SA1302). The Motorolas are more linear.

se
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Old 28th May 2003, 07:57 PM   #13
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InnerSound Kilowatt Monobloc

Is that a two channel bridged mode mono amp?
or a true single channel ?

56 transistors? beefy

cost?
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Old 29th May 2003, 01:43 AM   #14
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Quote:
Originally posted by thylantyr
InnerSound Kilowatt Monobloc

Is that a two channel bridged mode mono amp?
or a true single channel ?
Bridged.

Quote:
56 transistors? beefy
Yeah. 'Specially given that they're all the big TO-3P type devices.

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cost?
For the amp? I don't recall off the top of my head what InnerSound's asking for it. I did a quick search and saw mention of it on audiophilia.com at $14,000 per pair.

se
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Old 29th May 2003, 02:04 AM   #15
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Interesting ideas. Yeah, the TIP transistors are good transistors, but I don't think they're at all suitable for my design. I need much faster and more linear transistors. And a slightly higher voltage.

2SA1302/2SC3281 are perfect, but I didn't know that digikey sold them. I might take that up, if not, even get the Motorolas, those are very nice transistors.

The design is a two channel bridged mono amp. This is to facilitate having lower voltage supply rails and making the amps cheaper to build.
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Old 29th May 2003, 04:13 AM   #16
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Sorry about the bridge to 4000W controversy. It's 500W unbridged and 2000 bridged. I figure I'll need 20 transistors per channel. That means 40 transistors per amp. If I use the A1302/C3281 pairs. That also means $324.80 for output transistors for both amps. Add tax and we come to $370.27 grand total. Hmmm, shipping should push it close to $390.00 or so depending on where they come from.


Anyway, when that money comes along, I have all the rest of the parts needed for building the amps.

Can't wait for that time.
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Old 29th May 2003, 04:39 AM   #17
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Quote:
Originally posted by Duo
Sorry about the bridge to 4000W controversy. It's 500W unbridged and 2000 bridged. I figure I'll need 20 transistors per channel. That means 40 transistors per amp. If I use the A1302/C3281 pairs. That also means $324.80 for output transistors for both amps. Add tax and we come to $370.27 grand total. Hmmm, shipping should push it close to $390.00 or so depending on where they come from.
How are you coming up with the $324.80 figure?

If you're using 40 transistors per amp, and you're making two amps, that's 80 transistors. At the 10-99 piece pricing of $1.98, that comes to 80 x 1.98 or $158.40. If you mean you're using 40 PAIRS of transistors per amp, then at the 100 piece pricing, that comes to 160 x 1.54 or $246.40.

So what accounts for the extra $166.40 or $78.40?

se
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Old 29th May 2003, 04:40 AM   #18
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The transistors are about $4.00 each.
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Old 29th May 2003, 04:53 AM   #19
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I've also decided to raise the rails to +-75V from +-45V because I calculated that 45V rails in bridged amps wouldn't get me even up to 1000W on 4ohm speakers. lol.
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Old 29th May 2003, 05:44 AM   #20
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$14000 pair?

Ispiration to keep my DIY project
moving along.

I stop sometimes and wonder
why I kill myself to achieve high goals...
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