I have! I saw a little black blob in the middle. Even if I scraped that off I doubt I'd find a part number. I'm a little surprised there isn't a successor to the 3909 (that the rest of us can use, not just major manufacturers). Sometimes you just want a blinky light (trains, kites, etc), a uP is overkill, and you couldn't be bothered figuring out the 555 RC values. Tony > why dont you buy one and open it up? > > ----- Original Message ----- > From: "Spehro Pefhany" > To: "Microcontroller discussion list - Public." > Sent: Thursday, August 04, 2005 5:34 AM > Subject: Re: [EE] A replacement for the LM3909? > > >> At 01:32 AM 8/4/2005 -0700, you wrote: >> >On Aug 4, 2005, at 1:14 AM, Tony Smith wrote: >> > >> >>Anyone know what chip bicycle flashers use? They're 1.5v, blink AND > have >> >>on/off. Must be billions of the buggers made... >> > >> >I don't think I've ever seen one that ran off 1.5V; most use several >> >cells. In fact, I might add "improved batteries" to the list of thing >> >leading to the demise of the 3909 - even the smallest, cheapest (thing >> >trade show giveaway) blinky things throw in extra batteries. >> >When you can go to a web site and buy a couple lithium batteries, >> >several LEDs, a COB IC to drive them, and some magnets to hold them >> >somewhere, all for less than $2 in ones; why would anyone use a 3909? >> > >> >BillW >> >> Yes, the one I just bought uses 2 AAA cells. They probably use a cheap > CMOS >> COB chip designed for the task (not even a low-end COB micro). I have >> not >> yet taken it apart. >> -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist