[sdiy] UA726 clone possible?

[Tom Bugs]

You are, of course, right... SOIC is kind of big here!

Could still be worth trying the idea out with BCM847 duals or DMMT3904 
-- or I should look over the Linear Systems webpage to see if there's 
any alternatives..

[those cheap duals could be useful for the heater transistors. Noting 
also that two of the transistors are connected as diodes, I think - Q7 & Q8]

Tom

On 09/09/2015 14:46, Jarno Verhoeven at ziggo.nl wrote:
> You can only get LS318 in SOIC, ideally you get something in a smaller case, for
> it to fit the TO-can packaging.
> There's BCM847bs/ds, but the matching isn't as good as LS318 (they do have them
> in PNP, and NPN/PNP (the latter not matched)). Does anybody know of similar
> parts, like DMMT3904?
>
> Jarno.
>
>
>
>> Op 9 september 2015 om 15:21 schreef Tom Bugs <admin at bugbrand.co.uk>:
>>
>>
>> Sorry, please reply to this one so it has a new thread title:::
>>
>> ********************************
>>
>> I wondered before why no-one seems to have done a clone of the ua726.
>>
>> Doesn't *SEEM* all that complex?!
>> A nice matched pair (eg LS318) is the main core.
>> 6 transistors (I presume general purpose?), 2 x 6V2 zeners and 6
>> standard resistors.. - those parts being for the heating element.
>>
>> Get the pin placement right, encapsulate it in goo..
>>
>> What am I wrong on?
>>
>> [I don't want to fully take on such a project, though could potentially
>> do a design up for initial testing with a view to someone running a
>> production in a friendly open-source-ish manner]
>>
>> Tom
>>
>>
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