Group Buy: legit, non-fake CA3080AE ICs - new from Rochester Electronics

[theundeadelvis]

Or maybe a group buy through someone like Small Bear. Maybe he could get a good price, get himself some stock, and only have to ship to one person.

[Barcode80]

Or maybe a group buy through someone like Small Bear. Maybe he could get a good price, get himself some stock, and only have to ship to one person.

Again, he already has this piece in stock, he has 160 of them...

[smallbearelec]

I will contact them and order for stock. Thanks for letting me know about this!

SD

[theundeadelvis]

Or maybe a group buy through someone like Small Bear. Maybe he could get a good price, get himself some stock, and only have to ship to one person.

Again, he already has this piece in stock, he has 160 of them...

I understood this, but if he could order an even larger quantity (being the facilitator of the group buy), he might get a better price break and be able to offer them lower than his usual price. Obviously, the preference would be to sell what is in stock, but since there is a group of people wanting to do a group buy, this may be a way for him to stay in the mix and make a little profit.

[merlinb]

Anything that needs a CA3080 can also be built with an LM13700- it's functionally identical, plus you get a two in one package, and free darlington buffers. It would be a lot cheaper just to modify your layouts to use LM13700 than to spend dollars on obsolete CA3080s...

[WhenBoredomPeaks]

Is it possible that they are faking HT8950 too? (i couldn't get 2 of them to work, maybe it was the datasheets or my breadboards fault)

[smallbearelec]

Is it possible that they are faking HT8950 too? (i couldn't get 2 of them to work, maybe it was the datasheets or my breadboards fault)

Did they come from me? I bought those from Holtek's Taiwan distributor and have not had any complaints till now.

[The Groke]

The LM13700 ICs that I have found (with US sources) are all priced at over 2.50 per item (unless you buy like 500 of them).  Futurlec has them at 1.50... but I never really know if I can trust their parts. My sense is that they aren't out to fool anyone, but that they aren't all that tight on quality control either. My fears may be unfounded though. Any opinions on this???

And I would still personally like some 3080s anyways. I'd rather not spend time making adaptors when repairing old pedals and analog synths. But I totally agree that it's somewhat pointless if you are designing your own stuff.

[WhenBoredomPeaks]

Is it possible that they are faking HT8950 too? (i couldn't get 2 of them to work, maybe it was the datasheets or my breadboards fault)

Did they come from me? I bought those from Holtek's Taiwan distributor and have not had any complaints till now.

No, by they i referred to the guys who are selling fake chips on ebay. I've bought 2 from some random korean seller and they aren't working but i wouldn't say that the chips are fake (yet) because i've seen others having problems with the datasheet or maybe my breadboard is wrong so i gotta keep tinkering with it some more.
I just wanted to know that is it possible that it is not my mistake that the circuit isn't working.

[Barcode80]

The LM13700 ICs that I have found (with US sources) are all priced at over 2.50 per item (unless you buy like 500 of them).  Futurlec has them at 1.50... but I never really know if I can trust their parts. My sense is that they aren't out to fool anyone, but that they aren't all that tight on quality control either. My fears may be unfounded though. Any opinions on this???

And I would still personally like some 3080s anyways. I'd rather not spend time making adaptors when repairing old pedals and analog synths. But I totally agree that it's somewhat pointless if you are designing your own stuff.

Lm13600 is a functional and pin for pin equivalent to lm13700. It can be had for $.85 right here:

http://www.smallbearelec.com/Detail.bok?no=224

However, as my thread on the subject proved out, it is not that easy to redesign circuits to use LM13700 (LM13600) in place of CA3080. Read more here:

http://www.diystompboxes.com/smfforum/index.php?topic=90066.20

[merlinb]

However, as my thread on the subject proved out, it is not that easy to redesign circuits to use LM13700 (LM13600) in place of CA3080. Read more here:

The CA3080 can be directly replaced with LM13600/700 in 99% of cases. I don't know about the CA3094, but the thread you linked doesn't appear to conclude anything. At face value it appears it too can be replaced with an LM13700 (but maybe not LM13600).

[Scruffie]

Anything that needs a CA3080 can also be built with an LM13700- it's functionally identical, plus you get a two in one package, and free darlington buffers. It would be a lot cheaper just to modify your layouts to use LM13700 than to spend dollars on obsolete CA3080s...

There are a few benefits to the CA3080, Smaller Package, can be useful in spots... that and the projects already using it and the cases where you only want a single OTA.

I see cases for both parts, I wouldn't use a LM13700 if I was going to have half left over but I wouldn't use a CA3080 if I needed more than one OTA if I was designing the Circuit/PCB.

However, as my thread on the subject proved out, it is not that easy to redesign circuits to use LM13700 (LM13600) in place of CA3080. Read more here:

The CA3080 can be directly replaced with LM13600/700 in 99% of cases. I don't know about the CA3094, but the thread you linked doesn't appear to conclude anything. At face value it appears it too can be replaced with an LM13700 (but maybe not LM13600).

Yeah the CA3094 can be replaced by a LM13600 sometimes but it's more work, don't think we have any expects on that conversion yet, but it can be done.

The only reason the CA3080 seems easier to convert is because of this link (that's now missing, basically how the Tonepad Small Stone is set to work I recall) http://yfrog.com/f/64schematqj/

[pinkjimiphoton]

i  bought ca3080e's from ebay, 10 of them, they all work in my vocalizer with no problem.

10 for 10 bux shipped from this guy:

http://www.ebay.com/itm/260843285119?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

took about 10 days from hong kong.

[DavenPaget]

There's a DIP8 replacement for the CA3080 , but it's VERY costly 
it's the NTE996 from Element14/Farnell
http://sg.element14.com/nte-electronics/nte996/ic-transconductance-amp-2mhz-dip/dp/4526818

[pinkjimiphoton]

nte996 is not an exact replacement, didn't work well in the colorsound vocalizer at all.

[DavenPaget]

nte996 is not an exact replacement, didn't work well in the colorsound vocalizer at all.

It didn't ? Oh well . The datasheets claim the same specs . Sorry 

[pinkjimiphoton]

i tried three different ones in the vocalizer, hearing they weren't always compatible.

so i ordered one from china...that never arrived.
i DID get my money back, tho.

so i ordered 10 from the evilbay vendor i posted...they all sounded subtly different.. #3 was the one i went with.  i'll save the nte's for a compressor or something.

[demym]

does anyone built this pedal with 3080E ?
I built the Ross Dyna Comp using CA3080E.

The problem seems to be the CA3080E...
when removing it (soket!!) and wiring pin 2(in -) with 6(out) and/or pin 3(in +) with pin 6(out) I get the guitar signal,
when i put the chip onto the socket ..get only silent.
What is should be (I'm 100% the circuit is correct.. checked and re-cheked several times)?

Sorry for bad english , hoping it's clear enough...
Thanks in advance

[liquids]

The LM13700 ICs that I have found (with US sources) are all priced at over 2.50 per item (unless you buy like 500 of them).  Futurlec has them at 1.50... but I never really know if I can trust their parts. My sense is that they aren't out to fool anyone, but that they aren't all that tight on quality control either. My fears may be unfounded though. Any opinions on this???

And I would still personally like some 3080s anyways. I'd rather not spend time making adaptors when repairing old pedals and analog synths. But I totally agree that it's somewhat pointless if you are designing your own stuff.

Lm13600 is a functional and pin for pin equivalent to lm13700. It can be had for $.85 right here:

http://www.smallbearelec.com/Detail.bok?no=224

However, as my thread on the subject proved out, it is not that easy to redesign circuits to use LM13700 (LM13600) in place of CA3080. Read more here:

http://www.diystompboxes.com/smfforum/index.php?topic=90066.20

That thread proves that it's not that easy?

It's not that easy, if you don't spend the time to understand OTAs, or electronics for that matter.  

That thread, and another where I drew a working schematic to make the Microsynth filter which uses 3x3094 OTAs (much more rare and expensive than 3080s) work off 13X00 OTAs (smallerbear - 85 cent dual package; mouser - 65 cent dual package) should prove that it IS easy.  It's as easy as making an old circuit/schematic that uses 1 741 op-amp work with a 4558.  It's not as easy as replacing the dual op amp in a tubescreamer.  

[liquids]

http://www.diystompboxes.com/smfforum/index.php?topic=91917.0

Certainly this circuit is complex.  Possibly more complex than the great majority of things that someone here may be desiring to use 3080s for.  Which is the point...if it can be done here, it can be done anywhere.

In the Synth DIY world, filters and voltage controlled features are the name of the game.  And no one in that realm is really pining over old OTAs. Tillman wishes the 2380 or whatever would come back for it's superior performance...that's about it.   13X00 chips are in nearly every circuit design I run across in the synth realm.  Oh wait...did I say circuit design?