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Old 17th January 2008, 09:02 PM   #2071
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what type of cap are u using for the 1uF ??
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Old 17th January 2008, 09:17 PM   #2072
mikelm is offline mikelm  England
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http://www.newark.com/25M8079/passiv...OS-B32560J105K

these are ok

mike
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Old 19th January 2008, 04:18 PM   #2073
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Quote:
Originally posted by richyrich212t
I would like to implement the the snubber option on my lm4780 kit. what would you suggest for cap and resistor options
The snubber values are listed on a schematic included with LM4780 PCB. I didn´t experiment here much, and those are the values CarlosFM recommended: 2.7R and 0.1uF. I do not use snubbers myself.
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Old 21st January 2008, 03:20 AM   #2074
DeanP is offline DeanP  Canada
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Question Half snubberized=problems?

Peter,

I rebuilt my old kit to include two more LM4780 parallel non-snubberized boards.
My old kit consisted of three stereo LM4780 boards "snubberized". Now I am using the same power supply (snubberized) to power one stereo board and these two new parallel ones.
I am getting "thumps" when I power on and when I power off. (only coming from the speakers hooked up to the parallel boards)Although the sound isn't as loud when power on as power off.
Do I need to "snubberize" the two new parallel boards to eleviate this problem?

NOTE: The other two stereo boards have their own power supply, which are all snubberized. No thumps from them.
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Old 22nd January 2008, 04:35 PM   #2075
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In my experience thumps are ususally caused by improper grounding, adding snubbers should not solve the problem.
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Old 26th January 2008, 09:56 AM   #2076
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Default LM4780 with VU meters

Hi!

I'm planning to buy a LM4780 kit and have an idea of connecting vu meters to each channel for a retro look. Is this possible or is it to complicated?
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Old 28th January 2008, 04:49 AM   #2077
DeanP is offline DeanP  Canada
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Quote:
caused by improper grounding
Hmmm? Where could I have gone wrong and where should I check first?
I am completely stumped with this improper grounding...
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Old 28th January 2008, 05:21 AM   #2078
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I had an email exchange with another person also experiencing thumps and this is what he recently wrote to me:

Problem solved _ There is no grounding on the
extension power line cord that I used.
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Old 28th January 2008, 05:22 AM   #2079
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Default Re: LM4780 with VU meters

Quote:
Originally posted by ChristianL
'm planning to buy a LM4780 kit and have an idea of connecting vu meters to each channel for a retro look. Is this possible or is it to complicated?
Now I could be completely stumped, as I never did it before, but I don't think it would be a a big problem.
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Old 29th January 2008, 03:56 AM   #2080
DeanP is offline DeanP  Canada
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Quote:
Problem solved _ There is no grounding on the
extension power line cord that I used.
Well mine is grounded properly that way. I guess I'll have to take it out of the rack and do some troubleshooting later this winter. Arg! Thanks!
I'm sure I will be back with questions and some photos later on...
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