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Chip Amps Amplifiers based on integrated circuits

LM3886 Zobel's network
LM3886 Zobel's network
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Old 10th June 2012, 09:24 AM   #1
francesco81rs is offline francesco81rs  Italy
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Join Date: Dec 2011
Location: Camponogara (VE)
Default LM3886 Zobel's network

Hello everyone,
for the Zobel's network in the output of a circuit with 3 LM3886 put in parallel, what kind of resistances is most appropriate (Eg. Carbon / Metal oxide)?
In terms of tolerance and power, what are the right values​​?
thanks a lot
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Old 10th June 2012, 09:44 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
If you never test the HF power output then you never need high power dissipation capability in the Zobel. Ordinary 600mW resistors will do. One to each 3886.
The caps should be low esr. Any film type should be good but go to higher voltage rating than the Rail to Rail. Try 100Vdc
1%, or 2%, or 5%, or 10% tolerance are all OK.

Carbon composition have low inductance and there may be an argument for using low inductance here. But few if any seem to bother with that. I use metal film. But I beef up the power rating because I do sometimes test with HF high power signals. 4off series parallel 10r 600mW gives 10r 2.4W
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 11th June 2012, 07:19 AM   #3
francesco81rs is offline francesco81rs  Italy
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Join Date: Dec 2011
Location: Camponogara (VE)
Thank you, Andrew.
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