[sdiy] [OT] LM13700 spotted in commercial product of big Manufacturer

[Richie Burnett]

I've noticed a gradual trend towards increasing MOQs at the smaller suppliers like Farnell/Newark, RS, Digikey, Mouser recently. Unfortunately that's not good news for the smaller hobby builder who doesn't want to commit a few hundred pounds on a reel of a few thousand parts. I guess that leaves the murky waters of eBay for picking up smaller quantities.

Re the original question as to why Fender designed in an obsolete DIP OTA, I'd imagine the answer is either that they already had substantial stock of these chips, or that they took advantage of a last time buy at a good price.

-Richie,


---- Gordonjcp wrote ----

>On Mon, May 16, 2022 at 09:36:14AM -0700, David G Dixon via Synth-diy wrote:
>> Through-hole TL072 is currently more or less unobtainable.  The main
>> manufacturer, TI, is completely out of stock.  TI is really the only good
>> place to buy TL072 (which, although half of a TL074 in functionality, tends
>> to be significantly more expensive than TL074), since their price is a
>> fraction of the price you typically find at the big retailers.  I use
>> through-hole TL072 by the thousands, and it is admittedly a bit of a worry
>> for me right now.  Through-hole TL074 are readily available and still very
>> cheap.  Unfortunately, I use far fewer of those, as they are significantly
>> less convenient from a layout perspective.
>
>Maybe it would be worth respinning your board to take SOIC-8 TL072 as well as through-hole?  You'd maybe need to make a custom footprint and think carefully about how tracks cross underneath.
>
>It's mental that Farnell are showing a lead time of May next year for their cheapest TL072CDT at £0.136 each for a reel of 2500!  You'd have to go for the TL072CDR for slightly more at £0.136 each per 1000.
>
>If you want through-hole then you'd have to buy the much much more expensive TL072IP at £0.80 apiece, or £0.66 each per thousand.
>
>For a fifth of the price it's probably worth thinking about going SMD...
>
>-- 
>Gordonjcp
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