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Burning Amp BA-3
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Old 8th August 2019, 02:21 PM   #2361
rafapb is offline rafapb  Brazil
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After a lot of time trying to zero the offset at the Front End (which proved to be very difficult), I settled for "close enough", at about 0.025 V when in thermal equilibrium.

Now, it is finally up and running! Thanks a lot for the priceless advice!

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Old 11th December 2019, 08:57 PM   #2362
airborne11b is offline airborne11b  United States
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Default Source Resistors

The build guide mentions that you can use 0R68 or 0R47 in place of the 1R source resistors. I do have output fets matched to +- 0.01Vgs. What is the risk/benefit here? Does this affect dissipation? If so, how? What other factors might I consider here?
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Old 11th December 2019, 09:11 PM   #2363
Zen Mod is offline Zen Mod  Serbia
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Burning Amp BA-3
more Cojones , no risk

win-win
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Old 11th December 2019, 09:19 PM   #2364
airborne11b is offline airborne11b  United States
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Quote:
Originally Posted by Zen Mod View Post
more Cojones , no risk

win-win


I got plenty of cojones, but I am not made of cash!!
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Old 11th December 2019, 09:34 PM   #2365
Rush is offline Rush  United States
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Quote:
Originally Posted by airborne11b View Post
I got plenty of cojones, but I am not made of cash!!
He means the amp will have more cojones.

Rush
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Old 12th December 2019, 12:34 AM   #2366
airborne11b is offline airborne11b  United States
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Quote:
Originally Posted by Rush View Post
He means the amp will have more cojones.

Rush
LOL makes sense. Care to elaborate on how this resistor change affects the operation? More specifically i am concerned about dissipation and stability. I am new to amp building and even newer to transistor amps.
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Old 12th December 2019, 12:39 AM   #2367
Hikari1 is offline Hikari1  United States
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Yes it effects dissipation but you can adjust the bias to compensate.

It allows less "buffer" in bias stability between the mosfets...but if your mosfets are well matched you can get away with less source resistance. Less source resistance will allow the amp to go higher in Class A and provide more amps to the speakers. So, sounds better.

I would install .47R and then see if any mosfit "bias hogging" (one mosfet receiving significantly more voltage across source resistors than others) occurs. If not, you are good to go.
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Old 12th December 2019, 02:04 AM   #2368
airborne11b is offline airborne11b  United States
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Thanks Hikari!
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