UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Retired Texas TI99/4A engineer needs help please.

Boater Sam · 25th Oct 2018, 2:44 pm

I don't have a Farnell account, is the UA724CNG4 the same chip or the UA724CN?
I have no knowledge of how TL331 works, I thought it was a comparator.
You say it should be generating an oscillating output? Presumably this is in the 20kc/s range to run the switch mode regulator chip?
Prices for these are crazy, is there a good reason?

25th Oct 2018, 2:44 pm	#22
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: Retired Texas TI99/4A engineer needs help please. I don't have a Farnell account, is the UA724CNG4 the same chip or the UA724CN? I have no knowledge of how TL331 works, I thought it was a comparator. You say it should be generating an oscillating output? Presumably this is in the 20kc/s range to run the switch mode regulator chip? Prices for these are crazy, is there a good reason? Last edited by Boater Sam; 25th Oct 2018 at 2:49 pm. Reason: added