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While opamps are almost always implementing some function by the use of a specific feedback network, the OTA is very often used open loop or partially open loop. Is it the same as CA?

Original Peavey part number is and the industry equivalent is CA The transistor arrays are certainly nice, but given how easy it is to hand-match transistors, I don’t see an array of less-than-great dataaheet on a chip as an especially compelling story.

It’s a very different internal design, with very different characteristics, and it is used in a different way. Ok, enough ranting and raving. Peavey replaced the original part with LMN but that is now obsolete also. CA kfl AN nF. They claim their original and later on the LMN xa3094 “selected” for those roles.

They have very few selected parts, but the ones they do have usually matter. Since there are no trimmers or presets to adjust gain or threshold, I imagine this circuit needs selectedprobably with transconductance within a certain range, to work “just right”. This may already be understood by those here, but note that, while they perform largely the same action as OTAs, the and are NOT the same chip and do not have the same pinout.


We are sorry but what FAB equiptment we did not move to Florida, we sold with the building. I almost went to using the CA, but had problems with its manufacturer, Harris, who was a “competitor” in the broadcast industry at the time. EHX also used the in many products. I tried, too, to persuade Intersil to keep at least the CA, which I use often.

CA , Tube CA; R̦hre CA ID, IC РIntegrated

Note that you can achieve very respectable dynamic range with this part, and that it will operate on just a few volts and with very little current.

Grant is a good guy, but I suspect, like me, he’d have to do the same research again to come up with an answer. Look at the data sheet, it is an op amp with an output transistor. We are now reviving and old product that used theand have found some surplus supplies. I realize that, but they are in critical roles in the preamp.

There are protons, neutrons, electrons, I don’t blame Intersil. Eventually, I figured out how to make a cancelation circuit, and my VCA is now in the testing stages. Don Tillman at November 10, In this application, the CAA is operated substantially below its supply. You got the phasor working, now replace the les criticalone you stole. It features a very nice input diode linearization circuit, low noise, low offset voltage, and it comes in matched pairs.

Do you know of any date codes to avoid with the Harris or Intersil parts? Originally Posted by nosaj. I am designing a high order analog filter for the audio range.

Education is what you’re left with after you have forgotten what you have learned. We have seen such things elsewhare, specially in the Audiophoolery world, but Peavey is a solid feet on the ground type of company, when they say specially selected I believe them, in this case being equivalent to “matched power transistors”, “selected for low noise Op Amps or transistors”, etc. Now you can comment. Neil Schubert at February 23, I suggested elsewhere that while it was more critical in the phasor, it wasn’t elsewhere in the amp.


CA Selling Leads, Price trend, CA DataSheet download, circuit diagram from

Originally Posted by Tone Meister. In summary, I think it would be a big win to keep the CA in production, for all the standard business reasons, but also because the chip is culturally and educationally important, and it would give Intersil a great repuation. Ordered a couple from each source, thanks guys. Somebody picking up the ?

Peavey cx3094 a master semiconductor reference with all their house numbers. Would this be equivalent or better then AE for audio range? I’ll stick to my own circuit, due to the costant discontinuation of fixed ICs.

The stupidity of the IC industry is that they neglect to understand that the VCA is one function that does not work well in digital.

CA3094 Datasheet

It’s an amplifier; and like an opamp it has a pair of differential inputs and a single output. The is clearly the most advanced and flexible.

They could just as easily left everyone hanging. Just the kind of book Enzo should write. Pond at May 20, The US is the largest exporter of industrial controls – which use lots of linear ICs.