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Old 7th November 2005, 09:31 PM   #21
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Default fixed dupe traces

Also fixed a couple minor placement issues.
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Old 8th November 2005, 12:35 AM   #22
ble0t is offline ble0t  United States
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Looks nice...gotta love the symmetry of an 'X' design
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Old 8th November 2005, 11:03 AM   #23
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Default Dumb questions

First of all, thanks for putting this together. Iassume sometime in the future you will offer PCB's to build.
Do most use 60 - 80 volt rails for this circuit? Never could understand why the preamp rails are so high. Have a power amp whith 13 volt rails, seems the rail voltage should be the other way around.
Also looking at the IRF610 I originally thought of getting some IR brand from digikey. Then found some Samsung brand. Does everyone use IR type for the BOSOZ type circuits?
A friend tells me that IRF510 will work in most circuits using IRF610 and sound better. Think it is more as a driver application, but may try. The one at the bottom may be a place to start.
I will have to try this, been using the same circuit for line stage for a couple years. Time to give something else a listen.

George
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Old 8th November 2005, 11:27 AM   #24
steenoe is offline steenoe  Denmark
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Do most use 60 - 80 volt rails for this circuit?

With mosfets, yes. Running the higher railvoltages gives much improved performance. Better linearity in the audioband and less noise.
IR devices has some of the lowest input capacitance. Look for the Ciss value in the datasheets. The lower the better. (Higher Ciss, gives more high frequency distortion.) The 510 and 610's are just different in rating (volt/amps) they are fairly similar otherwise.
You might be able to find devices that are just as good, but I havent yet

Steen
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Old 8th November 2005, 12:23 PM   #25
eLarson is offline eLarson  United States
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Default Re: Dumb questions

Quote:
Originally posted by Panelhead
A friend tells me that IRF510 will work in most circuits using IRF610 and sound better.
George,

I don't know about "better" but I can say that I've tried it with IRF510's (non-Xified BOSOZ with CCS) and also IRFD110's and it sounded fine with either one.

Knowing that in my system I'd never need more than 1V out, I used lower rail voltages, but also smaller drain resistors. (CCS in the source legs) As a result the operating point of the MOSFETs were more or less the same as in the article.

eL
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Old 8th November 2005, 01:48 PM   #26
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Default Request for help. :)

Hi folks,

First I want to thank everyone for their kind words and helpful tips.

Now I need a little help with this circuit. I am not sure about ratings of certain parts, especially the resistors.

Particularly:

R3, and R4

R1, R2, R6, and R7

It looks like the other resistors can be standard .25W metal film types correct?

Also what voltage rating should C1 be 100V?.

Also I plan on resizing C2 and C3 to be 25mm diameter and 10mm LS which should fit most common snap-in 100-200V 1000uf caps. Right now it is set up of 7.mm straight lead types.

Any help with these details from those familiar with the circuit is great appreciated.

Cheers!
Russ
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Old 8th November 2005, 02:43 PM   #27
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Dear All,
I also interested in this project.
I have done a PCB layout with single side.
After that I have stopped because of the "Volume
Design". I can't figure out which is "Cheap" , "Easy"
and "Best Performance" !(digital,traditional etc.,)

Thomas
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Old 8th November 2005, 02:45 PM   #28
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Sorry !Forgot the image !
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Old 8th November 2005, 07:31 PM   #29
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Russ,

In my circuit, I used a single 1/2W resistor where you have split it to two resistors (R3 and R4). I believe you can use 1/4W with your circuit.

I used a single 5W resistor where you are using R1/R6 in parallel. For R1, R2, R6, R7 I would recommend 3W rated resistors as a minimum.

As to C1, its voltage rating will depend on the value of your negative rail voltage, which can be in the range of 10-20 volts. I don't think you will need a 100V rated cap there.

Lastly there is one set of resistors missing, which I included when I built my preamp, but missed including on the schematics. Q2 and Q3 need 221 ohm gate resistors in the connection to the voltage references. (My Bad ).

Otherwise it is looking great.

Cheers, Terry
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Old 8th November 2005, 08:43 PM   #30
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Default gate stoppers and another dummy question

Plan on using pots to control volume in mine. Do they need to be 10K? Seems that the input capacitance was high enough that a 10K pot was recommended to prevent high end roll off.
Have several 25K laying around unused. Hate to buy more to use here.
Also, output coupling cap selection. What is the range of dc seen here? If it is real low, may try to use some output transformers to do the balanced to single ended conversion. Prefer iron to caps where possible. Do not want to use both.


George
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