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27th January 2006, 01:33 PM
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#1 |
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diyAudio Member
Join Date: Dec 2005
Location: PA
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Emitter Resistors
What would be a good choice for emitter resistors in a 50W-100W design?
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27th January 2006, 01:54 PM
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#2 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Anything in the range 0.1 ohm to 0.47 ohm, it's a trade off of temperature stability and distortion. Higher the resistance better the temp stab.
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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27th January 2006, 04:15 PM
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#4 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Not really, since they are inside the negative feedback loop.
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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27th January 2006, 06:41 PM
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#5 |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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Hi,
for your range of power it looks like a 1pair or 2pair output stage is suitable. I suggest about 3W wire wound. I have seen on this forum a suggestion that the emitter resistors should be non inductive but I cannot confirm this. If non inductive is important then wirewound is not suitable unless they are specially wound to eliminate inductance. I believe a few manufacturers can supply this specification. |
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27th January 2006, 09:02 PM
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#6 |
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diyAudio Member
Join Date: May 2005
Location: Cacak, Serbia
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It is neither expensive nor particularly complicated to make them non-inductive if one does that this way as I am doing last 20+ years. If you use metal-film 1% 1/2W resistors, this way you have practically non-inductive 5W resistor that occupy les space and is much cheaper than some exotic "audiophile-grade" types. Please note that there are TWO emitter resistors of 0,1 ohm on the picture! This might be useful idea for someone.
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27th January 2006, 10:17 PM
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#7 |
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diyAudio Member
Join Date: Dec 2005
Location: PA
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RCD
I just bought a lot of 100 RTD135, 0.4 Ohm, 3W for $12.00. Think they will work OK?
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27th January 2006, 11:02 PM
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#9 |
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diyAudio Member
Join Date: Dec 2005
Location: PA
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RCD info...
Hey Chris...
I'm attaching the data sheet... seems like they are pretty decent ones. Guess I got a good deal after all!
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