The JRC integrated circuit by Japan Radio Company is a dual high gain operational amplifier internally compensated and constructed on a single silicon . GENERAL DESCRIPTION. □ PACKAGE OUTLINE. The NJM/ integrated circuit is a dual high-gain operational amplifier internally. See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet. ORDERING INFORMATION. 1. TSSOP −

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JRC4558 myths…

Last edited by kak; 26th October at Equating complex number interms of the other 6. Pinout can vary by different types so allways check from datasheet These are the pins in test circuits Replacement Transformer Started by ncag Today at 7: May 23, 4. In addition, the JRCD was used in tons of Jec audio equipment at about the same time, so a junky cheap Japanese stereo or clock radio could have several hidden inside it.

I didn’t overhear anything. May 24, 7. Pioneer Elite vsxtx water damage no power Started by Watin Today at PV charger battery circuit 4. Personally, I think it’s the build of the pedal and the sum of all components. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. How to test the IC having part no.


I’m just wondering where things currently stand. Datasheets, Manuals or Parts.

JRCD Datasheet, PDF – Alldatasheet

Daasheet tone control circuit is fairly easy to assemble using an op amp, but again I stress the need for more info But even all of these years later, the mystique around the ‘ still amazes me. My unscientific conclusion was that the best chip probably has yet to be found. What have y’all overheard at the musician’s watercooler discussions?

I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. Synthesized tuning, Part 2: There is some confusion at present over what is a true or “vintage” JRC But I beleive the old JRC version is the holy grail of some even though the actual chip in some of the originals may be made by others.

The MC is very old and had poor performance. I don’t think I went overboard with the cost on this one. What are the specs for the power amp? They were consistently good. Yesall normal types Point for measuring output signal with voltmeter or scope. I 45558d the 3 listed above enough to ‘splurge’ and order about 15 of each. By continuing to use this site, you are consenting to datasheeet use of cookies. I wish I could say that it sounded noticably better but the TL that I put in the amp did!


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. Distorted Sine output from Transformer 8.

Could you be a little more specific with the kind of help you are looking for? It’s amazing how some of these falsehoods prevail. I’m just curious, because most pedal experts seem to concur that both old and current production chips from different parts of Asia all tend to sound consistently the same.

The TL has a lot higher input impedance extremely higher actually. Part and Inventory Search.

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. Consider reading this before posting: People are building clones and ditching their ‘real deals’ because they sound datqsheet. They are still available in isolated caches of parts, although they can sometimes be hard to find. May 23, 3.

PNP transistor not working 2. There is a post above that is proof positive of this.