diyAB Amp - The "Honey Badger" - Page 82

JojoD818 · 23rd June 2012, 12:09 AM

Who is JP?

Oh sorry did I say "high"? I thought I said "high side".

But thanks for summing that all up.

Harry3 · 23rd June 2012, 06:49 AM

Guys thanks for the replies.
I just want to clarify - can I add an extra output transistor using 60V rails to easily drive 4 ohm loads? If yes what modifications? Thanks.

JojoD818 · 23rd June 2012, 07:29 AM

There are already 3 pairs of output transistors, are you asking for a 4th pair?

Harry3 · 07:50 AM

Yes I would like to use 4 pairs - for 4ohm or less loads.

JojoD818 · 23rd June 2012, 07:53 AM

With a substantial amount of heatsink, the original 3 pair output can already drive 4 ohms loads with gusto as long as your psu can also handle it. I did try it for home hifi only though, not for a party rig. It also used the recommended output transistors, I did not upgrade to the big ones.

Harry3 · 23rd June 2012, 08:10 AM

Re-reading Andrew's post 751 - he was refering to two pairs of output transistors, only being able to drive 6 ohms. So I assume 3 pair would be enough for 4 ohms. However I would prefer to have 4 pairs on the ouput.

AndrewT · 23rd June 2012, 10:16 AM

Yes, I was referring to a 2pair output stage using those transformer voltages.
The actual load capability will depend on how you build the amplifier and how hot you run it and what PSU you use and what your view on reliability vs de-rated SOAR you have.

Personally, I would carry out a modeling of the amplifier PSU+Output stage & Driver stage to assess what it's load capability could be. That is beyond many Members here, so I posted a quick and easy guide.

naf · 23rd June 2012, 10:42 AM

Would it still good performance if i build HB using mje340/350 instead of ksc3503/ksa1381?

AndrewT · 23rd June 2012, 10:44 AM

If you don't know, then don't modify.

naf · 23rd June 2012, 10:56 AM

Sir, i.m not modify it. I read on build guide there is alternative for 3503/1381.
If still good using 340/350 i would like to build, if don't i'll try another

23rd June 2012, 07:38 AM	#814
Harry3 diyAudio Member Join Date: Mar 2005 Location: Sydney - Australia	Yes I would like to use 4 pairs - for 4ohm or less loads. Last edited by Harry3; 23rd June 2012 at 07:50 AM.

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23rd June 2012, 12:09 AM	#811
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	Who is JP? Oh sorry did I say "high"? I thought I said "high side". But thanks for summing that all up.

23rd June 2012, 06:49 AM	#812
Harry3 diyAudio Member Join Date: Mar 2005 Location: Sydney - Australia	Guys thanks for the replies. I just want to clarify - can I add an extra output transistor using 60V rails to easily drive 4 ohm loads? If yes what modifications? Thanks.

23rd June 2012, 07:29 AM	#813
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	There are already 3 pairs of output transistors, are you asking for a 4th pair?

23rd June 2012, 07:53 AM	#815
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	With a substantial amount of heatsink, the original 3 pair output can already drive 4 ohms loads with gusto as long as your psu can also handle it. I did try it for home hifi only though, not for a party rig. It also used the recommended output transistors, I did not upgrade to the big ones.

23rd June 2012, 08:10 AM	#816
Harry3 diyAudio Member Join Date: Mar 2005 Location: Sydney - Australia	Re-reading Andrew's post 751 - he was refering to two pairs of output transistors, only being able to drive 6 ohms. So I assume 3 pair would be enough for 4 ohms. However I would prefer to have 4 pairs on the ouput.

23rd June 2012, 10:16 AM	#817
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Yes, I was referring to a 2pair output stage using those transformer voltages. The actual load capability will depend on how you build the amplifier and how hot you run it and what PSU you use and what your view on reliability vs de-rated SOAR you have. Personally, I would carry out a modeling of the amplifier PSU+Output stage & Driver stage to assess what it's load capability could be. That is beyond many Members here, so I posted a quick and easy guide.

23rd June 2012, 10:42 AM	#818
naf diyAudio Member Join Date: Aug 2011	Would it still good performance if i build HB using mje340/350 instead of ksc3503/ksa1381?

23rd June 2012, 10:44 AM	#819
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	If you don't know, then don't modify.

23rd June 2012, 10:56 AM	#820
naf diyAudio Member Join Date: Aug 2011	Sir, i.m not modify it. I read on build guide there is alternative for 3503/1381. If still good using 340/350 i would like to build, if don't i'll try another