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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
LM13700's
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Uncle Krunkus
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PostPosted: Tue Jul 19, 2005 7:41 am    Post subject: LM13700's Reply with quote  Mark this post and the followings unread

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.

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dnny



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PostPosted: Tue Jul 19, 2005 7:56 am    Post subject: Reply with quote  Mark this post and the followings unread

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)

Last edited by dnny on Wed Jul 20, 2005 12:27 am; edited 1 time in total
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v-un-v
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PostPosted: Tue Jul 19, 2005 11:44 am    Post subject: Surface mount hell- 137 RIP? Reply with quote  Mark this post and the followings unread

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'!!)
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Etaoin



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PostPosted: Tue Jul 19, 2005 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

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!
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Macaba



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PostPosted: Tue Jul 19, 2005 2:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

No! Not my precious LM13700's! NOOOOOO!

Please don't take them away from me daddy!
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v-un-v
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PostPosted: Wed Jul 20, 2005 2:49 am    Post subject: Father Christmas bearing good tidings....... Reply with quote  Mark this post and the followings unread

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
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v-un-v
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PostPosted: Wed Jul 20, 2005 3:19 am    Post subject: Reply with quote  Mark this post and the followings unread

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/
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v-un-v
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PostPosted: Wed Jul 20, 2005 3:45 am    Post subject: Reply with quote  Mark this post and the followings unread

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



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PostPosted: Wed Jul 20, 2005 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

66 US cents?

Meaning... 38p?

If so...i'll pledge a few.
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v-un-v
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PostPosted: Wed Jul 20, 2005 12:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Macaba wrote:
Meaning... 38p?



Well yeah plus the VAT of course (well I think so anyway).
I'll give them a phone tomorrow- see what they say.

How many do you want?
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Macaba



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PostPosted: Wed Jul 20, 2005 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Approximately 13. Thats a lucky amount.
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davecake



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PostPosted: Thu Feb 02, 2006 2:04 am    Post subject: RS Components Reply with quote  Mark this post and the followings unread

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]
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bugbrand



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PostPosted: Thu Feb 02, 2006 8:01 am    Post subject: Reply with quote  Mark this post and the followings unread

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..!..)

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Uncle Krunkus
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PostPosted: Thu Feb 02, 2006 3:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.
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fluxmonkey



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PostPosted: Fri Feb 03, 2006 6:29 am    Post subject: Reply with quote  Mark this post and the followings unread

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

b
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v-un-v
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PostPosted: Sun Feb 05, 2006 2:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

bugbrand wrote:

SUPPORT RAPID ELECTRONICS
-- they kick the ass off Maplins.


To right!!! Very Happy Maplin suck!

bugbrand wrote:

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..!..)


well- I did find someone at Maplin who's passionate about electronic music- but that's rare because most people who work there seem to be into cars (yawn...!)

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Hank Reynolds 3rd



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PostPosted: Wed Mar 29, 2006 7:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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Uncle Krunkus
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PostPosted: Thu Mar 30, 2006 12:18 am    Post subject: Reply with quote  Mark this post and the followings unread

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

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neo644



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PostPosted: Tue Apr 04, 2006 10:24 am    Post subject: Reply with quote  Mark this post and the followings unread

whats the difference between the LM13600 ?
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dnny



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PostPosted: Tue Apr 04, 2006 11:59 am    Post subject: Reply with quote  Mark this post and the followings unread

neo644 wrote:
whats the difference between the LM13600 ?


its by hundred smaller Very Happy

no seriously :
LM13700
Supply voltage: ±18 alt +36 V max
Supply current: 2.6 mA typ
Offset voltage: 0.4 mV typ
Transconductance: 9600 μmho typ
Output current: 20 mA max
Slew rate: 50 V/μs typ
CMRR: 80 dB min
Bandwidth: 2 MHz typ
Temp. range: 0 to +70 °C
and
LM13600
Supply voltage: ±18 alt +36 V max
Supply current: 2.6 mA typ
Offset voltage: 0.4 mV typ
Transconductance: 9600 μmho typ
Output current: 20 mA max
Slew rate: 50 V/μs typ
CMRR: 80 dB min
Bandwidth: 2 MHz typ
Temp. range: 0 to +70 °C

so they seem pretty close to each other - like those identical twins. they look almost the same and you cant tell who is who. but if you spend more time whit them you know the difference.

for Sound Lab and other DIY-projects both are just as good as the other one

HTH
daniel

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Scott Stites
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PostPosted: Wed Apr 05, 2006 8:20 am    Post subject: Reply with quote  Mark this post and the followings unread

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
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mome rath



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PostPosted: Sun Apr 23, 2006 8:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.
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