mj11015/16

smokingmachine · 23rd February 2006, 06:51 PM

What is the maximum voltage(+/-) for those darlingtons?(i would use them in power amp

Thanx

anatech · 23rd February 2006, 07:00 PM

Hi smokingmachine,
These are rated for 120 Vc-e, so supply rails of +-60 VDC would be right on the edge. I wouldn't go past 45 or 50 V on your supplies and that leaves very little room.

-Chris

smokingmachine · 23rd February 2006, 08:13 PM

which one should i use than(i need bipolars for +- 80v----->90v)?

Are there any bipolars that would match mj11015/16 but that they are rated to higher voltage?

anatech · 23rd February 2006, 08:19 PM

Hi smokingmachine,
Normally, one would use standard audio outputs like the MJ21195 and MJ21196. The collector current rating is lower. You would also use audio driver transistors, like another one of these. Note that you should be using 4 to 6 of these outputs per type for this output power. A large heatsink will be required.

Can you post the schematic you intend to use? There may be other issues at these high supply voltages.

-Chris

smokingmachine · 23rd February 2006, 09:14 PM

I have schematic on a paper so I can not post it!I will try to do some photos and than posted it!!!

so there arent any bipolars that would be rated for +-85V?

anatech · 23rd February 2006, 09:33 PM

How many outputs do you think you need per channel?

How much power do you expect to get?

-Chris

CBS240 · 24th February 2006, 04:42 AM

Hi Smoking,

Here is a small list of outputs from On-Semi typically used for audio applications.

It is a .xls file, but must use zip to attach here.

AndrewT · 24th February 2006, 11:36 AM

Hi Smoking,
there are hundreds of BJTs suitable for +-90V.

Look for Vce0>180V.

However, if you choose some close to this limit you will often find that the SOAR at 90V is not as good as one rated at 230Vce0.

Download the datasheets for a few and start extracting the permitted current at your chosen rail voltage to make comparisons.

MJE 21193/4 as well as the 21195/6 mentioned earlier are possible candidates.

smokingmachine · 24th February 2006, 12:14 PM

i would use 6 darlingtons per volatge rail and the power would be around 800w rms!!!!

if the amp could deliver 600w+rms at 2 ohm load at +-56V, then it could deliver around 800wrms at 4 ohm load at +-80V?

AndrewT · 24th February 2006, 12:42 PM

Hi Smoking.
NO!
600W2r needs 49Vpk. +-56Vdc after rail droop and then subtract amp losses may just give 600W but expect a little less.

800W4r needs 80Vpk. +-80Vdc at the rails will NEVER give 800Winto 4ohms.

23rd February 2006, 06:51 PM	#1
smokingmachine diyAudio Member Join Date: Sep 2005	mj11015/16 What is the maximum voltage(+/-) for those darlingtons?(i would use them in power amp Thanx

24th February 2006, 11:36 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Smoking, there are hundreds of BJTs suitable for +-90V. Look for Vce0>180V. However, if you choose some close to this limit you will often find that the SOAR at 90V is not as good as one rated at 230Vce0. Download the datasheets for a few and start extracting the permitted current at your chosen rail voltage to make comparisons. MJE 21193/4 as well as the 21195/6 mentioned earlier are possible candidates. __________________ regards Andrew T.

24th February 2006, 12:42 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Smoking. NO! 600W2r needs 49Vpk. +-56Vdc after rail droop and then subtract amp losses may just give 600W but expect a little less. 800W4r needs 80Vpk. +-80Vdc at the rails will NEVER give 800Winto 4ohms. __________________ regards Andrew T.

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23rd February 2006, 07:00 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi smokingmachine, These are rated for 120 Vc-e, so supply rails of +-60 VDC would be right on the edge. I wouldn't go past 45 or 50 V on your supplies and that leaves very little room. -Chris

23rd February 2006, 08:13 PM	#3
smokingmachine diyAudio Member Join Date: Sep 2005	which one should i use than(i need bipolars for +- 80v----->90v)? Are there any bipolars that would match mj11015/16 but that they are rated to higher voltage?

23rd February 2006, 08:19 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi smokingmachine, Normally, one would use standard audio outputs like the MJ21195 and MJ21196. The collector current rating is lower. You would also use audio driver transistors, like another one of these. Note that you should be using 4 to 6 of these outputs per type for this output power. A large heatsink will be required. Can you post the schematic you intend to use? There may be other issues at these high supply voltages. -Chris

23rd February 2006, 09:14 PM	#5
smokingmachine diyAudio Member Join Date: Sep 2005	I have schematic on a paper so I can not post it!I will try to do some photos and than posted it!!! so there arent any bipolars that would be rated for +-85V?

23rd February 2006, 09:33 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	How many outputs do you think you need per channel? How much power do you expect to get? -Chris

24th February 2006, 12:14 PM	#9
smokingmachine diyAudio Member Join Date: Sep 2005	i would use 6 darlingtons per volatge rail and the power would be around 800w rms!!!! if the amp could deliver 600w+rms at 2 ohm load at +-56V, then it could deliver around 800wrms at 4 ohm load at +-80V?

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