I have to agree with Tony. 9420 is a typical date code (week 20 in 1994) while 2904 does not make sense as date code (week 4 in 1929 or 2029???). And a voltage regulator from two op-amps with some external reference (look for a zener diode) sounds reasonable.
If it is - as you say - a voltage doubler, the reference might just be gained by a 2:1 resistive voltage divider from the output, which is compared with the input voltage to give the error signal. It might as well be that the op-amp are just used to monitor the output current... Uwe. RR> Hi all, RR> I have a chip that has the ST logo on it and two numbers: RR> 2904 and 9420. Its an 8-pin SOIC package. I am assuming RR> the 2904 is the date code. I did a search on the ST site for RR> "9420" and came up empty. Does anyone have any idea RR> what this chip might be? RR> Thanks, RR> -Bob RR> -------------------------------------------------------------------- RR> Robert Ritchey RR> Quest Engineering & Development RR> 1328 East Cottonwood Lane RR> Phoenix, AZ 85048-4765 RR> Tel: (480) 460-2652 RR> FAX: (480) 460-2653 RR> E-Mail: [EMAIL PROTECTED] RR> E-Mail: [EMAIL PROTECTED] RR> E-Mail: [EMAIL PROTECTED] RR> E-Mail: [EMAIL PROTECTED] RR> WWW: www.QuestEngDev.com/ RR> WWW: www.Smart-Fly.com/ RR> -------------------------------------------------------------------- -- Author: Uwe Zimmermann INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- 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).
