[sdiy] Designing Analog ICs

[Oren Leavitt]

On 9/6/2011 8:51 PM, Matthew Smith wrote:
> Quoth Paul Perry at 07/09/11 11:15...
>> ----- Original Message From: "Tom Corbitt"
>> > .... (my dream was to remake > the lm3909)
>>
>> There are a lot of analog chips that I would like to see resurrected..
>> but I can't see much need for that particular one, seeign as it is
>> apparently easily made from common discretes.
>> http://home.cogeco.ca/~rpaisley4/LM3909.html
>
> Lay out the board carefully, and it may even be possible to make a
> plug-in replacement if all the passives are 0603 or smaller. (Not that
> I'd try soldering anything smaller than an 0603 - they're about my limit!)
>
>

I did at one time make a plug-in replacement for the 3909 on an 8 pin 
DIP header using TO92 transistors and 1/4 watt resistors packed tightly 
together.
It worked every bit like the original LM3909.

- Oren