LM13700's

Uncle Krunkus · Posted: Tue Jul 19, 2005 7:41 am Post subject: LM13700's

Where do you guys get these?
I've tried checking all my standard sources.
I even got 5 "samples" sent to me from National Semiconductor for free, but when they arrived I realised they were the SMD version (M).
The LF442/4's I can get from Farnell. The FET's are stocked by Jaycar, but these LM13700's just don't seem to be around down here.

dnny · Posted: Tue Jul 19, 2005 7:56 am Post subject:

if you cant find it.
here are some substitutes for LM13700

LM13600
NE5517
AU5517
NTE870

post: substitutes for Sound Lab IC´s

hope this helps

daniel

EDIT: removed info about CA3080 (there is no buffered input)

v-un-v · Posted: Tue Jul 19, 2005 11:44 am Post subject: Surface mount hell- 137 RIP?

I'm sure I heard somewhere that the LM13700 (DIL form) were to be discontinued. I took this up with a couple of people in Maplin (Electronic Supplies) recently, who assured me that this was not the case- and they had hundreds in stock. But I checked recently and they only had 15 left in the entire country. A search on Farnell too revealed only SMD's too.

I'd hate to loose the LM13700 (even the Aphex Twin pays tribute to it on the back of 'Surfing on Sinewaves'!!)

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Funnily enough, I was going through the catalog of a local supplier here in the Netherlands when building my Soundlab and thought I was forced to go for the LM13600 replacement, as they didn't list the LM13700. To my surprise, they shipped LM13700s as replacements for out of stock LM13600s!

Macaba · Joined: Jul 13, 2005 Posts: 160 Location: UK

No! Not my precious LM13700's! NOOOOOO!

Please don't take them away from me daddy!

v-un-v

I've just phoned and spoken (so much better than lousy email!) to National Semiconductor and they assured me that the LM13700N isn't to be discontinued- phew! I can sleep again :) But it may look like they are in short supply- hence the drought. But don't quote me on that. All these industries can be quite coy.

Tom

v-un-v · Posted: Wed Jul 20, 2005 3:19 am Post subject:

Future electronics were a company that NS pointed me to. Unfortunately there's a minimum order of 25 pieces, but we could do a group purchase if anyone is interested- as they work out at 77p per chip (including VAT)

http://www.futureelectronics.com/contact/

v-un-v · Posted: Wed Jul 20, 2005 3:45 am Post subject:

whoops- that price is all wrong. It's in US dollars. So we are talking 66 cents each- woohoo! even better :)

Macaba · Joined: Jul 13, 2005 Posts: 160 Location: UK

66 US cents?

Meaning... 38p?

If so...i'll pledge a few.

v-un-v · Posted: Wed Jul 20, 2005 12:39 pm Post subject:

Macaba · Joined: Jul 13, 2005 Posts: 160 Location: UK

Approximately 13. Thats a lucky amount.

davecake · Joined: Feb 01, 2006 Posts: 1 Location: Perth, Australia

Its seems the LM13700s can be ordered in Australia via RS Components. At least, I just ordered one and they say its in stock, I'll be picking it up tomorrow.
http://www.rsaustralia.com/[/url]

bugbrand · Posted: Thu Feb 02, 2006 8:01 am Post subject:

Easy & good UK supplier for LM13700s is Rapid Electronics: www.rapidelectronics.co.uk

LM13700 is 98p or less for 10/25/bulk (ok so that's probably more than Future Electronics, but you may have to pay extra for postage etc)

SUPPORT RAPID ELECTRONICS
-- they kick the ass off Maplins.
-- free and quick delivery on orders over £25, cheap postage if under £25
-- they're my main supplier for all components/tools/bits'n'bobs

-- they've always been spot on, no errors, really friendly if you've got a special request (.. I'm surprised, Tom V-un-V, that you were able to find someone in Maplins who even knew what an lm13700 was... they don't tend to be the best staff..!..)

Uncle Krunkus · Posted: Thu Feb 02, 2006 3:42 pm Post subject:

I ended up getting a tube of 25 of them from Digikey in the states. I think they worked out at about $3 each (including postage). I'd like to make a set of DS7s so I 'spose they will get used. If anyone (especially in OZ) would like a couple for a Soundlab I'd be happy to do a swap.

fluxmonkey · Joined: Jun 24, 2005 Posts: 708 Location: cleve

Jameco looks like they have 'em, $1.49@.

b

v-un-v · Posted: Sun Feb 05, 2006 2:19 pm Post subject:

Hank Reynolds 3rd · Posted: Wed Mar 29, 2006 7:02 pm Post subject:

Aaahh,Maplins...such a beautiful place (I used to work at the one in Manchester a few years ago...but you had to be 'special' to work upstairs where all the good shit was!!!)....
I think the scare of the LM13700's disappearing came about as loads of factories in Japan and the US got screwed royally last year,through natural disasters etc....

Cool Site btw ,New here....found my way via
http://www.diystompboxes.com/smfforum/forums.html

Smile

Having a good old sniff at the WSG synth....mmmmm

Uncle Krunkus · Posted: Thu Mar 30, 2006 12:18 am Post subject:

Gidday Hank,
Welcome to electro-music.com! Smile

neo644 · Joined: Aug 18, 2005 Posts: 43 Location: Argentina

whats the difference between the LM13600 ?

dnny · Posted: Tue Apr 04, 2006 11:59 am Post subject:

Scott Stites · Posted: Wed Apr 05, 2006 8:20 am Post subject:

The LM13700 has the Darlington buffer unbiased, where in the LM13600,
the darlington is biased by the Iabc current.

The gain cell between the two is identical. Therefore, if you are not using the buffers, there would be no discernible difference between the two.

There are a few cases where one device may work fine, but the other not so fine. One case I recall is the original MS-20 filter (the later version that used the LM13600 OTA instead of the custom Korg IC) - JH noted on the Synth DIY list that replacing the LM13600 with an LM13700 did not work out too well - there was more thumping with the LM13700.

But, as mentioned before, if you're not using the Darlington buffer, there's nothing to worry about, and I imagine in most applications, even when using the buffer, one probably wouldn't notice much difference, except, perhaps in some cases, on fast transients.

Cheers,
Scott

mome rath · Posted: Sun Apr 23, 2006 8:42 pm Post subject:

I'm pretty sure I managed to score these chips from mouser or digikey... but I've been procrastinating so long on this project that I don't have the confirmation email, so I can't really say which company.