Amplifier suggestion for college project

tguzella^TuX64 · 14th May 2005, 11:07 PM

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???

ElectroPower · 15th May 2005, 02:04 AM

Vai a este site

http://www.audiofanatic.it/Schemi/Ti..._finaliSS.html

taj · 15th May 2005, 08:27 AM

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

djk · 15th May 2005, 09:16 AM

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?

paulb · 15th May 2005, 01:12 PM

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

edl · 15th May 2005, 04:31 PM

http://www.audiofanatic.it/Schemi/Ti...W_IRF530_1.jpg
http://www.audiofanatic.it/Schemi/Ti...W_IRF530_2.jpg

tguzella^TuX64 · 15th May 2005, 05:07 PM

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

tguzella^TuX64 · 15th May 2005, 05:07 PM

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

tguzella^TuX64 · 15th May 2005, 08:09 PM

Quote:

Originally posted by edl
http://www.audiofanatic.it/Schemi/Ti...W_IRF530_1.jpg
http://www.audiofanatic.it/Schemi/Ti...W_IRF530_2.jpg

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

pinkmouse · 15th May 2005, 09:54 PM

If you can give up the fet outputs, you could build a Krell KSA50 clone.

15th May 2005, 02:04 AM	#2
ElectroPower diyAudio Member Join Date: Feb 2004 Location: Portugal	Vai a este site http://www.audiofanatic.it/Schemi/Ti..._finaliSS.html __________________ DIYers de lingua Portuguesa:

15th May 2005, 08:27 AM	#3
taj diyAudio Member Join Date: Feb 2005	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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14th May 2005, 11:07 PM	#1
tguzella^TuX64 diyAudio Member Join Date: May 2005 Location: ...	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???

15th May 2005, 09:16 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	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?

15th May 2005, 04:31 PM	#6
edl diyAudio Member Join Date: Oct 2004	http://www.audiofanatic.it/Schemi/Ti...W_IRF530_1.jpg http://www.audiofanatic.it/Schemi/Ti...W_IRF530_2.jpg

15th May 2005, 05:07 PM	#8
tguzella^TuX64 diyAudio Member Join Date: May 2005 Location: ...	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

15th May 2005, 09:54 PM	#10
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	If you can give up the fet outputs, you could build a Krell KSA50 clone. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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