> Hi Sukandar, You wrote: > I have a follow-up question on my VF display. All schematics I found so > far use driver chips (like my NS MM58241) on both the anodes and the > grids. However on the board the anodes are connected directly to the > micro controller.
> The whole things operates around a bias of approx. > -30V, I wonder how the micro can handle this...? It is not clear to me what you mean with "The whole things operates around a bias of appr. -30V". To what reference is this -30 V measured? If this is the ground pin(s) of the MCU this is strange. Or is the totaal MCU -30V with respect to some other point? Normaly the -30V is handled by open collector (drain) circuits which can withstand this voltage. Based on your description I can not say more about this. Regards, Harry -- Author: H.C. Croon INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
