Differences between Darlington and Bi-Polar

Clipped · 23rd July 2007, 03:28 AM

Do the legs of a darlington serve the same purpose as bi-polars?

what exacty is the difference in operation between a darlington and bi-polar?

what woud it take to convert a bi-polar amp to darlington based amp?

like in my other post i want to try switching devices and see what happens.

the darlingtons im thinking of are the BDW93/94 combos to replace BD909/910 devices.

what other modifications would be involved in doing this?

repaired an Audisn amp a while back and was blown away by the sound, although i know the outputs arent the only pieces in the chain, i just want to experiment.

thanks again

zigzagflux · 23rd July 2007, 03:46 AM

All darlingtons are bipolar, but bipolar is not necessarily a darlington.

http://en.wikipedia.org/wiki/Darlington_transistor

For an amplifier, you might be able to substitute a darlington for an existing single BJT, but it might not give you any improvement. A darlington will have a greater voltage drop, and given the same load, will dissipate more heat.

There are also other issues, such as capacitance and speed, that should be matched to satisfy the overall design.

If you do want to throw in a darlington, attempt to match characteristics as much as possible. Choose darlingtons that are recommended for audio use.

Clipped · 24th July 2007, 02:51 AM

hi zigzag, thanks for the info, it is a good primer for some good reading!

23rd July 2007, 03:28 AM	#1
Clipped diyAudio Member Join Date: Mar 2005 Location: home	Differences between Darlington and Bi-Polar Do the legs of a darlington serve the same purpose as bi-polars? what exacty is the difference in operation between a darlington and bi-polar? what woud it take to convert a bi-polar amp to darlington based amp? like in my other post i want to try switching devices and see what happens. the darlingtons im thinking of are the BDW93/94 combos to replace BD909/910 devices. what other modifications would be involved in doing this? repaired an Audisn amp a while back and was blown away by the sound, although i know the outputs arent the only pieces in the chain, i just want to experiment. thanks again

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23rd July 2007, 03:46 AM	#2
zigzagflux diyAudio Member Join Date: Oct 2006	All darlingtons are bipolar, but bipolar is not necessarily a darlington. http://en.wikipedia.org/wiki/Darlington_transistor For an amplifier, you might be able to substitute a darlington for an existing single BJT, but it might not give you any improvement. A darlington will have a greater voltage drop, and given the same load, will dissipate more heat. There are also other issues, such as capacitance and speed, that should be matched to satisfy the overall design. If you do want to throw in a darlington, attempt to match characteristics as much as possible. Choose darlingtons that are recommended for audio use.

24th July 2007, 02:51 AM	#3
Clipped diyAudio Member Join Date: Mar 2005 Location: home	hi zigzag, thanks for the info, it is a good primer for some good reading!

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