PCB or kit for power amplifier advise NEEDED

rmihai · 26th September 2005, 01:38 PM

Hi,

I have a fairly good idea of what kind of design I am looking for, just I don't know if someone offers a kit or at least a PCB board for this. Please let me know.

- min 175W in 8 ohms
- input stage: dual mono JFETs cascoded with MOSFET
- second stage: two paralleled JFETs cascoded with MOSFETs
- driver circuit fed from regulators using dual low-noise JFETs, Cascoded with MOSFETs for the input, and MOSFETs in the driver and output stage
- separate power supplies for the driver stage and the output stage

I am planning to use Toshiba C3281/A1302 outputs, Toshiba jfets, Hitachi mosfets, Caddock resistors, HEXFRED and/or FRED diodes, Elna capacitors.

So, is there any design/kit/pcb that you are aware of that will meet my needs?

Thanks a lot.

viktor1986 · 26th September 2005, 09:19 PM

Contact www.bas.abshost.net

You will find his E-mail and ask him.

rmihai · 28th September 2005, 10:59 AM

Any other ideas?

roger-k · 28th September 2005, 12:48 PM

What about this one:
http://sound.westhost.com/project101.htm

rmihai · 28th September 2005, 04:33 PM

I am seriuosly considering Rod Elliot's Project 101.

The problem is that I do not know its topology. Does it has dual mono JFETs cascoded with MOSFET in the input stage? Does it has two paralleled JFETs cascoded with MOSFETs in the second stage? The driver circuit is fed from regulators using dual low-noise JFETs, Cascoded with MOSFETs for the input, and MOSFETs in the driver and output stage?

Does it has separate power supplies for the driver stage and the output stage?

I do not know the answer to all these questions. Maybe someone who built already the Project101 can clarify for me.

Thank you once again.

carlmart · 28th September 2005, 07:41 PM

Quote:

Originally posted by rmihai

The problem is that I do not know its topology. Does it has dual mono JFETs cascoded with MOSFET in the input stage? Does it has two paralleled JFETs cascoded with MOSFETs in the second stage? The driver circuit is fed from regulators using dual low-noise JFETs, Cascoded with MOSFETs for the input, and MOSFETs in the driver and output stage?

Does it has separate power supplies for the driver stage and the output stage?

I do not know the answer to all these questions. Maybe someone who built already the Project101 can clarify for me.

What do you mean you don't know the topology of Project 101? The circuit is there. It's all bipolar with a MOSFET output.

Carlos

roger-k · 28th September 2005, 08:22 PM

Why don't send a mail to Rod Elliot and ask him these question.

amplifierguru · 29th September 2005, 12:38 AM

Hi rmihai,

You seem to require a very specific topology, why is that? You have a preconceived idea of what will perform for you which I doubt you'll find.

What about a very different topology - comp cascoded BJT (or modifiable to FET) diff'l inputs, comp emitter follower drivers followed by 4 pair of common source comp MOSFETs for 250W at typ 0.003% THD.

It will be available as a kit,details on my website when it's up - tomorrow!

Cheers,
Greg

26th September 2005, 01:38 PM	#1
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	PCB or kit for power amplifier advise NEEDED Hi, I have a fairly good idea of what kind of design I am looking for, just I don't know if someone offers a kit or at least a PCB board for this. Please let me know. - min 175W in 8 ohms - input stage: dual mono JFETs cascoded with MOSFET - second stage: two paralleled JFETs cascoded with MOSFETs - driver circuit fed from regulators using dual low-noise JFETs, Cascoded with MOSFETs for the input, and MOSFETs in the driver and output stage - separate power supplies for the driver stage and the output stage I am planning to use Toshiba C3281/A1302 outputs, Toshiba jfets, Hitachi mosfets, Caddock resistors, HEXFRED and/or FRED diodes, Elna capacitors. So, is there any design/kit/pcb that you are aware of that will meet my needs? Thanks a lot.

26th September 2005, 09:19 PM	#2
viktor1986 diyAudio Member Join Date: Jun 2005 Location: Belgrade, Serbia	Amplifier Contact www.bas.abshost.net You will find his E-mail and ask him. __________________ Pa mislim sta reci!

28th September 2005, 12:48 PM	#4
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	What about this one: http://sound.westhost.com/project101.htm __________________ Roger

28th September 2005, 08:22 PM	#7
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	Why don't send a mail to Rod Elliot and ask him these question. __________________ Roger

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th September 2005, 10:59 AM	#3
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	Any other ideas?

28th September 2005, 04:33 PM	#5
rmihai diyAudio Member Join Date: Oct 2004 Location: Toronto	I am seriuosly considering Rod Elliot's Project 101. The problem is that I do not know its topology. Does it has dual mono JFETs cascoded with MOSFET in the input stage? Does it has two paralleled JFETs cascoded with MOSFETs in the second stage? The driver circuit is fed from regulators using dual low-noise JFETs, Cascoded with MOSFETs for the input, and MOSFETs in the driver and output stage? Does it has separate power supplies for the driver stage and the output stage? I do not know the answer to all these questions. Maybe someone who built already the Project101 can clarify for me. Thank you once again.

29th September 2005, 12:38 AM	#8
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Hi rmihai, You seem to require a very specific topology, why is that? You have a preconceived idea of what will perform for you which I doubt you'll find. What about a very different topology - comp cascoded BJT (or modifiable to FET) diff'l inputs, comp emitter follower drivers followed by 4 pair of common source comp MOSFETs for 250W at typ 0.003% THD. It will be available as a kit,details on my website when it's up - tomorrow! Cheers, Greg

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Changing bridge. Advise needed	Fidelity Audio	Power Supplies	10	7th December 2010 11:11 AM
Help! Speaker design advise needed	beeroclock	Full Range	0	30th March 2007 11:58 AM
Wildlife Electronic Caller, advise needed	jringels	Class D	5	13th April 2006 10:14 PM
Simple Cap-Coupled CF Advise Needed	dr._sleep	Tubes / Valves	6	10th August 2005 06:50 PM
Box Construction .. advise needed	fast kat	Car Audio	6	13th April 2004 05:14 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read