About Surround Light System Project (Digital Variant) - 02,

[actek]

Hello there from Latvia!
I'm now trying to assemble the circuit from Elektor magazine (february, 2008) - the digital variant of the surround light system and have found that in scheme at page 26 resistors R11, R15 and R16 are 1KOhm, but in the list of the components (p. 27) and on your site resistors R5-R20 are 100 Ohm resistors. Which values are correct? Thanks for the answer in advance!
I've added screenshots for these places in the article.
Please, forgive my poor English...

[sarma]

As the pin is OE* ( low to enable) there should be no issues even if you use 100 Ohms. 1K should also work. The datasheet (attached) is not specific on this, as any pull up we should be careful to limit the current.

Hope it serves you need.

[actek]

Thanks a lot! I'll give a try for the 100 Ohm variant.

[actek]

Had some problems and put the assembling aside for some time..
Ive assembled the scheme completely (only SCART misses for now, as I don't need it), but still get some problems - when I switch it on, it flashes 3 times in RGB each, then starts changing colours slowly (rainbow) - as I assume, it's a test mode. But when I shorten the S2 pins for a moment, then it goes red and doesn't switch to analyzer mode anymore. The VGA from videocard is connected, and video-out enabled too.
Any suggestions? Thanks in advance!

http://www.youtube.com/watch?v=bWsG8arQLfA - thats how it looks and works (or not works)'

[ideas]

Hi actek,
I'm planning to assemble the circuit. Did you manage to make it work properly?

Thanks a lot.

[cedric83]

Hi everyone,

I have built the circuit using the same scheme but replacing I have replaced the MCU by a MSP4305529. The analog part is the same. I have some issue with the green color. It contains the sync signal and on average it has a higher voltage than the 2 other colors on my RGB output. As the result my leds follows the flow on the screen correctly but with a green color only... How to supress the sync signal from the green ? I guess it would fix my problem... I am surprised it is working for the author !