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I've used the PIC10F200T-I/OT as a cheap and chearful LED "Flasher 
(TM)". The only addition being a CAP and small signal MOSFET for higher 
current switching.

Nino.

Tony Smith wrote:

>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" <speff@interlog.com>
>>To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>>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.
>>>
>>>      
>>>
>
>
>  
>

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