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Old 26th January 2003, 12:46 PM   #1
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Default Parallelling O/P in P3A

Hi!

Wanting to re-design an old amplifier I came across the Rod Elliot Project 3A witch fits very well.

Would it be possible to parallell two pairs of output devices? Im thinking to use TIP3055/2955 since I have them around, and connect them as in the earlier project 03 "figure 2".

Anyone done this??
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Old 26th January 2003, 01:21 PM   #2
MikeW is offline MikeW  United States
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Yes, just put in some 0.1 ohm current sharing resistors. I tried a Altman split feed back experiment with 3 sets in parrellel. The first set to an 8 ohm load and the last 2 to the speaker. If you look at Rod's guitar amp he shows two in parrellel. Have fun, Mike.
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Old 27th January 2003, 12:36 AM   #3
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Would it also be a good idea to remove the .47 ohm emmitter resistor aswell?
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Old 27th January 2003, 12:45 PM   #4
hifi is offline hifi  Sweden
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how did the split feedback work out?

/micke
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Old 27th January 2003, 04:04 PM   #5
MikeW is offline MikeW  United States
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It was interesting. You should try it. You can change the sound of the amp depending on the load.
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Old 27th January 2003, 05:40 PM   #6
e96mlo is offline e96mlo  Sweden
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Quote:
Originally posted by MikeW
It was interesting. You should try it. You can change the sound of the amp depending on the load.
Doesn't that cause strange things to happen as the impedance of a speaker is changing with frequency?

Does the output impedance change with the altman topology?

Tell us more!

/Mar
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Old 28th January 2003, 06:41 PM   #7
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Default Hmm....

Sorry to be the one to ask....

What is a "Altman split feed back" any info on this??
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Old 28th January 2003, 07:52 PM   #8
e96mlo is offline e96mlo  Sweden
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You can read about it at his site:
http://www.altmann.haan.de/splif_page/

/Marcus
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