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A fellow Barco 800 owner and myself have been discussing offline how to clean up this +17VDC supply rail from the Switched Mode Power Supply (SMPS):
Here's a snapshot of the signal taken from my scope:
http://www.avsforum.com/avs-vb/attac...achmentid=4273
The 'noise' on this rail seems to be mostly:
- A low frequency (works out to 30Hz) rectified sine wave.
- A bunch of high frequency noise (0.8V peak to peak - seems like a lot for a +17VDC signal).
We'd like to add some extra filtering to get a cleaner image out of our BG800's.
What's the best design approach for getting rid of the 30Hz component? Add a bunch of large electrolytic caps in parallel to further flatten the AC component?
What about the high frequency component? Smaller ceramic disc caps in parallel? I have no idea.... this stuff's all a hazy memory from EE school...
Kal
Here's a snapshot of the signal taken from my scope:
http://www.avsforum.com/avs-vb/attac...achmentid=4273
The 'noise' on this rail seems to be mostly:
- A low frequency (works out to 30Hz) rectified sine wave.
- A bunch of high frequency noise (0.8V peak to peak - seems like a lot for a +17VDC signal).
We'd like to add some extra filtering to get a cleaner image out of our BG800's.
What's the best design approach for getting rid of the 30Hz component? Add a bunch of large electrolytic caps in parallel to further flatten the AC component?
What about the high frequency component? Smaller ceramic disc caps in parallel? I have no idea.... this stuff's all a hazy memory from EE school...
Kal