Zobel Network in bridge clone?

tone · 15th September 2003, 03:12 PM

do i need a zobel network on a parallel /bridge Lm3886 gainclone?

thanks.

analog_sa · 15th September 2003, 03:27 PM

Probably not, but why don't you just try? Concentra doesn't appear to use it either.

peranders · 15th September 2003, 03:35 PM

If you don't have any problems, you don't have to do something about it, but it does hardly any harm. 2.7 ohms + 100 nF, or something like that.

tone · 15th September 2003, 05:48 PM

>im afraid to try since the amp is working wonderfully.didnt know whether zobel can be use or not.
>this is my second gainclone..first is parallel clone...with zobel..
>btw: is power on "thump" normal? ..i didnt have this on my parallel clone...any cure?

thank..analog & per!

tone.

taterhead · 15th September 2003, 06:38 PM

look at the binding postsand you will see , small pcb with a r and c, looks like a zobel to me.

Hybrid fourdoor · 16th September 2003, 01:24 PM

Just for reference, how much does that cost? I mean with about $60 worth of LM chips, I guess $250

PhilW · 16th September 2003, 06:30 PM

Please can you tell me, because I am getting confused : on a bridge-clone, does the zobel go from one of the speaker terminal posts to earth? or two from each speaker terminal down to earth? or across the terminal posts in parallel with the speaker? or what?

tlmadsen · 16th September 2003, 06:53 PM

PhilW have a wery good question.

How do one apply a Zobel network to a bridged amplifier ??

There are two ways to go:

A. A zobel-network to ground for each of the "amplifier-arm" in the bridged amplifier. This makes sense and will for sure work.

B. Just applie the zobel-network between the two "HOT" amplifiers that makes up the bridged amplifier. This zobel-network will have no reference to ground.
This saves you one "zobel-network" and should in teori work just as well. Many class-D amps and other amplifier topologies that are "born" with bridged ouput seems to take this road.

However, I have never seen any explanation or test of solution A compared to solution B.
I have used B witch seems to work fine.
If someone have expirence or pros and cons of one compared to the other, please let us know.

Thomas

15th September 2003, 03:12 PM	#1
tone diyAudio Member Join Date: Aug 2002 Location: Malaysia	Zobel Network in bridge clone? do i need a zobel network on a parallel /bridge Lm3886 gainclone? thanks.

15th September 2003, 03:35 PM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	If you don't have any problems, you don't have to do something about it, but it does hardly any harm. 2.7 ohms + 100 nF, or something like that. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

15th September 2003, 05:48 PM	#4
tone diyAudio Member Join Date: Aug 2002 Location: Malaysia	zobel >im afraid to try since the amp is working wonderfully.didnt know whether zobel can be use or not. >this is my second gainclone..first is parallel clone...with zobel.. >btw: is power on "thump" normal? ..i didnt have this on my parallel clone...any cure? thank..analog & per! tone.

16th September 2003, 06:53 PM	#8
tlmadsen diyAudio Member Join Date: Aug 2003 Location: Roskilde - The vikingships	apply zobel to bridged amplifier PhilW have a wery good question. How do one apply a Zobel network to a bridged amplifier ?? There are two ways to go: A. A zobel-network to ground for each of the "amplifier-arm" in the bridged amplifier. This makes sense and will for sure work. B. Just applie the zobel-network between the two "HOT" amplifiers that makes up the bridged amplifier. This zobel-network will have no reference to ground. This saves you one "zobel-network" and should in teori work just as well. Many class-D amps and other amplifier topologies that are "born" with bridged ouput seems to take this road. However, I have never seen any explanation or test of solution A compared to solution B. I have used B witch seems to work fine. If someone have expirence or pros and cons of one compared to the other, please let us know. Thomas

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15th September 2003, 03:27 PM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Probably not, but why don't you just try? Concentra doesn't appear to use it either.

16th September 2003, 01:24 PM	#6
Hybrid fourdoor diyAudio Member Join Date: May 2003 Location: Ft. Worth, TX	Just for reference, how much does that cost? I mean with about $60 worth of LM chips, I guess $250

16th September 2003, 06:30 PM	#7
PhilW diyAudio Member Join Date: Feb 2002 Location: u.k. south coast	Please can you tell me, because I am getting confused : on a bridge-clone, does the zobel go from one of the speaker terminal posts to earth? or two from each speaker terminal down to earth? or across the terminal posts in parallel with the speaker? or what?

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