JRC datasheet, JRC pdf, JRC data sheet, datasheet, data sheet, pdf, New Japan Radio, = NJM / Dual Operational Amplifier. the end of the datasheet. Noninverting Amplifier Schematic. 1. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes. [CAUTION]. The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application.

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I feel this is the primary reason for the audible differences. Dataasheet old pedal was not superior to the new one in any way, in fact, it was inferior in ways.

I yanked it out and put it in my TS5. If you want a JRC chip for a project, get a new chip from Steve at Small Bear Electronics who jrf4558 them cheap sorry we dont have time to sell chips or small parts. They had nothing in common.

Jun 4, But even all of these years later, the mystique around the ‘ still amazes me. All of the ‘ variants sounded quite similar and ‘good’. And, of course, this is because they all meet the same specifications. I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon dattasheet In addition, the JRCD was used in tons of Japanese audio equipment at about the same time, so a junky cheap Japanese stereo or clock radio could have several hidden inside it.


Clever marketing can take advantage of this to sell a ten cent amp for ten bucks.

JRC Datasheet PDF – Dual Operational Amplifier

When you order these, you get parts that are labeled “JRC”. Definitely better than some of the garbage op amps that were used in the early TS9 reissues. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful.

Oh, and I should add that it’s unlikely listeners will “get the chips right” in say, blind testing between vintage JRC and new Fairchild. The TL drives things harder and it is tighter and crisper. There are millions of these vintage chips out there in old 70’s electronics junk. I know I read something recently about the that even when the TS was in original production, there was no single vendor.

JRC4558 Datasheet PDF

Yes, my password is: May 23, 4. Even the slew rates, which some believe gives a hint to what makes the ‘ good, were all different. These 3, in particular, sounded really, really good. The TL has a lot higher input impedance extremely higher actually.

However, I think the nature of how silicon works vs. Back to theI think that people are just applying NOS ideas to the chips like they do tubes. The clone had premium caps as well.

No, create an account now. Ben HarmlessJun 4, Put a TL in there and be prepared for an overly bright and brittle datashwet.


On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads. Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown sound” resistors? The thing is, op amps are actually fairly complicated devices internally, and can have widely varying behaviors for slew rate, noise, etc, while being “rated” the same in identical conditions.

I may even run some new tests with more chips, to see if I can find something better than my beloved TL Some circuits sound better with inferior spec’ed chips.

I’m just curious, because most pedal experts seem to concur that both old datawheet current production chips from different parts of Asia all tend to sound consistently the same.

I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap.

JRC4558 Dual Op Amp IC

Do you already have an account? People are building clones and ditching their ‘real deals’ because they sound better. I replaced the two output resistors with carbon film resistors I had laying around, and I just order a couple of new RCP’s for 25 cents a piece.