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Old 14th May 2005, 11:07 PM   #1
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Question Amplifier suggestion for college project

Greetings everyone,


I have been searching around for a medium power (b/w 30 and 50 W for 8 ohms), amplifier (or pre-amplifier + power amplifier), with a *fet output stage (if possible, using the IRF series), and also using "easy to find" components (although "easy" is pretty relative; btw, i'm from Brazil ) to build as a college project.

Elliott's project #101 (http://sound.westhost.com/project101.htm) seems to be perfect, but component values are not listed ... as this is a school project, i can't just buy the psb (unfortunately :P)

I have already found some schematics, but none seem to satisfy all (or at least most of the requirements above). I'd prefer a pcb-ready project, but this is not really a requirement...

Any special suggestions???
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Old 15th May 2005, 02:04 AM   #2
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Vai a este site

http://www.audiofanatic.it/Schemi/Ti..._finaliSS.html
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Old 15th May 2005, 08:27 AM   #3
taj is offline taj
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Default Contact Elliot

You never know. Why not send an email to Rod Elliot to see if you can just purchase access to his private area where the assembly instructions are? Just because you cannot use the PCB doesn't necessarily mean you cannot build his circuit.

I don't know what Rod policy is in the regard, but it certainly doesn't hurt to ask. His PCB prices are dirt cheap, given the quality of his designs, so purchasing a PCB and not using it, might also be an option for you.

..TAJ
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Old 15th May 2005, 09:16 AM   #4
djk is offline djk
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I wouldn't even give you a grade for building a design that wasn't your own.

The ESP design is for Lateral MOS only.

The IRF type FETs are very difficult to run in class AB without bias problems.

Why don't you take a look at the PASS Citation 12 Mosfet?
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Old 15th May 2005, 01:12 PM   #5
paulb is offline paulb  Canada
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Quote:
Originally posted by djk
I wouldn't even give you a grade for building a design that wasn't your own.

Good thing you're not a teacher.
Quote:
Originally posted by djk
The ESP design is for Lateral MOS only.

The IRF type FETs are very difficult to run in class AB without bias problems.

Why don't you take a look at the PASS Citation 12 Mosfet?
A link might be helpful.
http://www.passdiy.com/pdf/citation.pdf
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Old 15th May 2005, 04:31 PM   #6
edl is offline edl  Hungary
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http://www.audiofanatic.it/Schemi/Ti...W_IRF530_1.jpg
http://www.audiofanatic.it/Schemi/Ti...W_IRF530_2.jpg
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Old 15th May 2005, 05:07 PM   #7
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Quote:
Originally posted by djk
I wouldn't even give you a grade for building a design that wasn't your own.

The ESP design is for Lateral MOS only.

The IRF type FETs are very difficult to run in class AB without bias problems.

Why don't you take a look at the PASS Citation 12 Mosfet?
Actually, we are not supposed to design our own amplifier, as we don't have a good background on audio; this is not an end of course project; teacher's recomendations are: find a good, ready to use, design on the internet and build it
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Old 15th May 2005, 05:07 PM   #8
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Thanks for all the suggestions and comments... I really liked the Citation 12 (actually, the Mosfet 12, at figure 8).

I've read the file, but couldn't find a power rating for the amplifier... Something like 70W @ 4 Ohms?? What's the effect of decreasing the DC supply voltage (the suggested 42V is a little too high for me; would 30-35 be a good value? i'd be happy with an output power ~50W). Also, are the IRF130, MPSL51, MPSL01 easy to find? or are they obsolete by now? If so, any clues on replacements?

Thanks
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Old 15th May 2005, 08:09 PM   #9
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Hum, that's weird... I've tried to simulate this circuit in pspice, and it doesn't seem to work: no matter how is the input signal (i simulated using a sine wave), the output is constant @ -6V

i double-checked the schematic, and couldn't find any problems
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Old 15th May 2005, 09:54 PM   #10
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If you can give up the fet outputs, you could build a Krell KSA50 clone.
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