Can I use MANY MANY low power devices for 1 HIGH power amp? - Page 3 - diyAudio
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Old 31st January 2003, 05:27 AM   #21
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Quote:
Originally posted by peranders


Cool now! How many pairs do you really need and what type?

You need one or two pairs per channel and 15$ each seems much. You need 180-200 Volts, 10-15 A, 100-150 W, Rdson unimportant. If you lower your demand to 100 W = -3 dB! Think about that!
I'm confused..
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Old 31st January 2003, 10:08 AM   #22
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I'm not sure what you're moaning about as far as price goes.

If you build the Hadley with four $0.80 2N3055 per channel it can put out 150W/8R for a whopping total of $3.20 per channel for the outputs.
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Old 31st January 2003, 10:49 AM   #23
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Quote:
Originally posted by djk
I'm not sure what you're moaning about as far as price goes.

If you build the Hadley with four $0.80 2N3055 per channel it can put out 150W/8R for a whopping total of $3.20 per channel for the outputs.
I'm not complaining, but I can't read the numbers on the Hadley schematic.. Can I get 150watts using those cheap transistors? WOW
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Old 3rd February 2003, 07:11 AM   #24
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"I'm not complaining, but I can't read the numbers on the Hadley schematic.. Can I get 150watts using those cheap transistors? WOW "

Its just a bridge amp, although I like it better than most.

If you need some values, go look at 'el-cheapo' at ESP. The Hadley is even less expensive to build as it has no VAS.

http://164.195.100.11/netacgi/nph-Pa...S=PN/5,376,899

You need a TIFF viewer, click on 'images', go to figure 9 on page 8.
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Old 11th August 2004, 10:09 PM   #25
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Talking about AD161 transistors : they might be still in production, my local electronic shop sells some.
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Old 11th August 2004, 11:08 PM   #26
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Default Re: Can I use MANY MANY low power devices for 1 HIGH power amp?

Quote:
Originally posted by SkinnyBoy
Basically I wan to make a 150watt amplifier using any of the following parts...


MOSFETS:

IRFZ44 MOSFET: 60V / 50A (N channel, TO-220 package), 0.028ohm on resistance: (IRFZ44) $3 each

IRF820 MOSFET: 500V / 2.5A (N channel, TO-220 package), 3.0ohm on resistance: (IRF820) $3 each

SGSP239 MOSFET: (TO-126 package): (SGSP239) $1 each

MTP3055E MOSFET: 60V / 12A (N channel, TO-220 package), 0.15ohm on resistance: (MTP3055) $2.50 each

MTP2955E MOSFET: 60V / 12A (P channel, TO-220 package), 0.3ohm on resistance: (MTP2955) $3 each




--------------------------------------------------------------------------------

TRANSISTORS:

(NEW) POWER TRANSISTORS 2N3055: New TO3 package power transistor with metal case. Large but limited quantity: (2N3055) $1.20 each or 10 for $8.00

C8050 NPN Transistors: (2W 1.5A Hfe 120 - 200): (C8050) 20 for $5

C8550 PNP Transistors: (2W 1.5A Hfe 120 - 200): (C8550) 20 for $5

AD161 / AD162 TRANSISTORS: Obsolete germanium power transistors. These were once commonly used in the output of class B audio amplifiers. Max current 1A, Vce is 20V. AD161 is NPN, AD162 is PNP: (AD1612) $3 per pair



Some are failry low powered, but I have no money, and using more parts helps with heat disapation, so, basically, whats a safe number of what parts to use for a 150watt (into 8ohm) amplifier?? I am happy to use 10 or more devices, it makes the amplifier look more powerfull anyway.. lol.. I have searched for a few of these parts, but only found low power amps.. Please help.. I really need some ideas for my FIRST diy bi-amp / speaker system.. lol, perhaps I am aiming for too much in one go... ohh well..

ALSO ALSO ALSO ALSO!!! I don't want to brigde incase one day I want to use 4ohm speakers....

You may want to look into what type of MOSFet devices these are. I know that IRFZ44 is a hexfet device which is very non-linier and would make a poor audio amplifier. These are designed for switching applications, power supplies and such. I'm not sure of the other types you listed.
You want to use lateral mosfets for audio amps.

You could realistically use 2n3055 & mj2955 (PNP) and make two seperate channels, 75W rms 180 degrees phase shift(use a small input audio transformer with a grounded CT.) design each circuit for 4 Ohms and bridge them accross 8Ohms.
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Old 12th August 2004, 12:29 AM   #27
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I am afriad that the Hadley amplifier weblink doesn't work any more... and this:

http://qt.tn.tudelft.nl/publi/2002/RSI73Pieter.pdf

was the only Hadley amplifier I could find on the net....
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Old 12th August 2004, 07:38 AM   #28
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"I am afriad that the Hadley amplifier weblink doesn't work any more... "

It looks like not many can link to it direct. Try it this way:

http://home.kimo.com.tw/skychutw/

Then click on 'circuits', then 'Hadley 622 pdf'
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Old 12th August 2004, 07:46 AM   #29
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Thanks.. got it... looks like an interesting circuit! Split load phase-splitter to a diff pair, to a inherently bridged output... is that right?



Thijs
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Old 13th August 2004, 12:37 PM   #30
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Default Yes, you can, i made it once.

And sounds reasonable..... you can hear..... but not too long.

I also heard germanium too... my second amplifier was made with AC187/188.... 2.5 Watts...hummm good bass.

And them i enter hy class... 10 Watts with AD161/162

and today, will not like anymore this sound.... we have better sound now..better designs....but i could hear without big problems... but not too long, and i had not the experience i have today, maybe, today, no possible to hear again.

But is great to see those ideas... wonderfull....

Carlos
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