Thanks Jerry: I already looked at the datasheet and still couldn't see whether it needed sync.Idont think it does but was curious about the ref. input,also pins 1 and 3.When 3 is>1v,it will shut off or when pin 1<1.2 V,it will shut down also. Aside from those two conditions,I see it as a free-running device. Jerry <geiting@xxxxxxxxxx> wrote:Check out this link http://dion.swamp.dk/dl/UC3843.pdf for the data sheet. Jerry Eiting Christians Electronic Service Piqua, Ohio ----- Original Message ----- From: To: Sent: Wednesday, October 15, 2003 5:33 PM Subject: [TechAssist] uc3843 PWM osc/driver in 8pin DIP | Is this a free running osc. or does it get sync input? In other words,what inputs aside from Vcc does the device require? | | Neal Electronics 1901 E Wm. Cannon,Austin,Tx Suite A295 tel.5126635051 Fax.5124438808 | | **************************************************************************** * | Classifieds! Buy or Sell! | http://sell.tech-assist.org | The Tech Address Book: | http://www.tech-assist.org/secure/tip/contact.htm | Add a Repair Tip Here, or Change/Remove your Email Address: | http://www.tech-assist.org/secure/tip/main.htm | Lost Password: | http://www.tech-assist.org and select "Lost your Login Info?". | Email Archives: | //www.freelists.org/archives/techassist/ ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/ Neal Electronics 1901 E Wm. Cannon,Austin,Tx Suite A295 tel.5126635051 Fax.5124438808 ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/