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Old 2nd February 2013, 11:16 AM   #911
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Quote:
Originally Posted by cod3gen View Post
Not sure if its the right place,
but i wanted to give this amp a try. However, my PSU is at +-85v on load.. Would maybe be a bit too much when running this on 4r speakers? How would the amp handle it, do i need to change something, maybe add a pair or two of output transistors?
For +/- 85Vdc you should have six pairs of plastic output devices for driving four ohm speakers. +/-60Vdc really is the max for the Honey Badger.
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Old 2nd February 2013, 03:06 PM   #912
cod3gen is offline cod3gen  Norway
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Okey, no other changes needed?
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Old 2nd February 2013, 03:12 PM   #913
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Quote:
Originally Posted by cod3gen View Post
Okey, no other changes needed?
It would take a complete redesign. The Honey Badger has an EF2 output stage. Anything bigger should have an EF3. Look into the 6 pair Leach or Leach Double-Barrel.
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Old 3rd February 2013, 04:01 AM   #914
chunek is offline chunek  Singapore
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For driver, 2sc5171 & 2sa1930 are good pairs & have linear hfe ic performance.
For output stage, MJL3281 & MJL1302 OR NJW3281 & NJM1302 are another option.
All of them are available in mouser.
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Old 3rd February 2013, 11:40 AM   #915
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Quote:
Originally Posted by wangyungpi View Post
Does anyone here build DiyAB Honey Badger amp with out stability issues?
What stability issues are you having?
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Old 6th February 2013, 01:31 PM   #916
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Sorry if I missed it, but what does R9, R10, and R14 do in the LTP CCS do?
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Old 6th February 2013, 05:29 PM   #917
Art M is offline Art M  United States
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Quote:
Originally Posted by Stormrider View Post
Sorry if I missed it, but what does R9, R10, and R14 do in the LTP CCS do?
1. Help us All out. Leave out R9, R10 and R14 then report to us how the circuit you built responds to the upgrades.

2. Earl Muntz circuit improvement methods are a well established design process.

3. Plant the circuit in question in to Spice and give it a run or two and report to
us how the circuit responds. " What if " questions are ideal for Spice examination
and you would be Helping your self and others.
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Old 7th February 2013, 11:44 AM   #918
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Quote:
Originally Posted by Art M View Post
1. Help us All out. Leave out R9, R10 and R14 then report to us how the circuit you built responds to the upgrades.

2. Earl Muntz circuit improvement methods are a well established design process.

3. Plant the circuit in question in to Spice and give it a run or two and report to
us how the circuit responds. " What if " questions are ideal for Spice examination
and you would be Helping your self and others.
I'm simulating a similar amp, using the BC550 pair for the CCS, KSC1845 for the diff pair, and a simpler two transistor current mirror. R14 at 2.2K does lower overall distortion, but I'm not sure why. R9 makes it worse, and R10 doesn't do much that I can see. I assumed there was a real world application for them that would not be easy to see in a sim.
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Old 10th February 2013, 12:44 AM   #919
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Quote:
Originally Posted by Stormrider View Post
Sorry if I missed it, but what does R9, R10, and R14 do in the LTP CCS do?
Found my answers... R9 is to prevent the current sink pair oscillating (found mentioned in Walt Jung's "Sources 101" article in Audioexpress); R14 is for isolating the differential pair form the capacitance of Q7.
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Old 10th February 2013, 04:11 AM   #920
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It fascinates me that the opamp internals mirror the typical Class AB Amplifier; and there are some fantastic audio opamps now; NE5532 and OPA2134's I favor. I saw a great "tube" video where a person had, I think, three silicons which was putting out some decent volume with minimal parts. And the "Long Tailed Pair" Tube Amp Front-End (12ax7 Phase Inversion) always finds it way into the solid state world by necessity. The concept is the same, just bigger and different parts. It's all the same. We enslave electrons to dance at frequencies that we can see with our ears.
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