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Started by ebartlet The Lab. Once again I really don’t understand much about solid state circuits and ICs and the such.

So what do these datasheet 8 pin thingies do? I imagine they are like tubes in that they can do a variety of things, and that you can swap different ICs to get a different sound, like swapping a 12AX7 for a 12AT7. I figure the is part of an amplifier. I googled and couldn’t find much except people selling them. The reason I ask, besides understanding, is that each module on my console has about several dx, I don’t have a schematic, but just by datasueet at the PCB it looks like there are 3 on the EQ, one with the aux sends, and one by the bus assignments.

I figure there is something out there that I can swap these out for to give me a jrc558dd sounding console. Some Burr Brown’s or maybe even something discrete.

I just remember someone once telling me to get rid of those s. Gus Member NJ Posts: However they don’t seem to be equal between companys.

Part of some guitar effects sound can be due to the ic used. Some ICs when overdriven sound more musical than others. The ts stuff is kind of based on the opamp used in the stock circuit.

At low gain settings most opamps sound about the same in the ts circuit. Why the stuff in this ost? If the s are JRC or TI you might want to try the circuit at high gain settings to see if maybe they might add something nice to the sound. If they don’t the good old would be the first sub I would try.

Rossi Member Germany Posts: The is a standard dual opamp. It’s a fairly old design and not really good for audio.

Unless you want to build a Tube Screamer pedal, that is.

JRC4558 myths…

There are direct upgrades from JRC, i. Those are widely used in more contemporary equipment such as Mackie, Samson, and Behringer. The NJM is virtually everywhere these days. You’ll find it on zillions of soundcards, mixers, etc.

Those chips will be a serious upgrade, but few people get excited about them. There are zillions of other dual opamps out there that you can try.

(PDF) jrc4558dd Datasheet download

Just search the metas; there’s lots of info on opamp upgrades. I definitely want to upgrade to Burr Browns or something quality. I’ll look up some Dual Op Amps. If anyone knows any killer ones, chime in. I have a whole bunch that I have been collecting out of old Japanese radios from the 80’s that I scrapped out. Swapping them and the output resistors make the TS9 live up to the specs – but keep in mind that its diodes that cause the clipping in the TS pedals. If you wanna go crazy, you can change some caps too that high pass some of the bass frequencies from the diodes once again, this is just what I have heard through the vine or the diodes themselves.

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I think the best thing to do before replacing the opamp is to grab some alligator clips and play with the caps and diodes. Milkmansound Milkmansound on Myspace. It’s descended from the single and the dual. It was all right in its day but it’s not a very good opamp by current standards. It’s used nowadays only in guitar stuff and maybe some really cheap consumer gear. Effects pedals abuse the chips; the exact way they respond to abuse is the “sound”. And “minor” chip redesigns that do not affect the “normal” performance can make significant difference when you go outside the normal range.

Not only that, but mostly NPN. Wonderful chip for many chores, even today. The can be criticized for not being fast enough for clean high-level audio. It wasn’t even made for that.

Theaside from being dual, pushed the speed of the core, to the point that it was considered good enough for a lot of audio work. JRC is still selling tons of super chips, using improved processes to give excellent audio performance.

Aside from basic design, there is another audio issue. Most chip makers think low power consumption is a priority. In a lot of electronics, it is.

JRC Datasheet pdf – = NJM / Dual Operational Amplifier – New Japan Radio

Even in an 8-in board, the difference between TL and power demand will make a big difference in power supply size and cost. If they are starved, the chips jrc4558dx all published specs and give nice low power consumption, but garble the fine detail in good audio.

The chip foundry awareness of this problem may have something to do with why certain brands and vintages of multi-sourced chips are favored by audio geeks. And since most opamps have MANY non-audio uses, most foundries are not focused on “our” needs. One reason we like NJR is that they have a large audio market, and are small enough to cater to it. Like I said I have modded a number of TSs and own 7 TS and ts type effects, all setup different chips, caps, gain I let my friends try them not knowing what datzsheet mods are jrc5458dd they can pick the mod they want not one of them is the same as a real TS,one is as close datasyeet I can get so far.

I believe I know why.

I can get close to the datasehet of an that has the ” datzsheet I have been told by friends that they all don’t sound alike. There is one part that has no brand markings and gives just the right grit to smooth with signal level in the magic s. Any sub part of the same type or other type of build I try just does not have it. I am begining to think it was a run of a somewhat defective part that justs sounds good. A need a realy good player Datashet know a few with a good amp and guitar to hear what it does.

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I have not been able to copy it and I doubt others have, but how can anyone tell unless they have a real to check it against. Its daatsheet a big difference and it only realy shows with a good player and good equipment IMO. What do you guys think about the OPA ? I just don’t want to blow up my PSU. Do any of you guys live in the LA area and wouldn’t mind looking over my console so I don’t blow it up?

NJMDD / JRCDD Original Japan, DIP8 – Retroamplis

CJ Member California Posts: Yes on what Paul said. The first line you read in the abstract of a data sheet is “runs on 0. I datasheeh don’t care about this, but other people do. It is a good beginners and sometimes experienced geek’s referance that is out of print dahasheet Radio Shack.

I will not scan all the kid’s projects in the back, but will put up the main info. If I can’t fix it, I can fix it so nobody else can! Christian Member Chicago Jr4c558dd Here’s the input module, http: It also looks like most of the feedback loops are pF.

Any input anyone can give please chime in. I have been wanting to swap out the M1 op amp in the mic pre for something more high end, but I mainly use outboard pre’s so it’s the mixing side I’d like to upgrade first.

I asked about this console before http: Sometimes I think I’m dyslexic. What’s the difference between dagasheet the NE’s? Mouser s Thanks to anyone with ideas. Nachoman, It looks like we’ve forgotten about you, but that is not the case. I am going to datawheet out the schem and go over it this weekend and make some recommendations then. Thanks soooo much, I’m hoping the PSU will have the strength to provide the current for the more hefty op amps.

Jrc4558dv has a fairly larger transformer so hopefully I’m in luck. Thanks a lot to all of you who share your time and knowledge to those of us who are just starting to understand electronics.

We would be still shopping at Guitar Center if it weren’t for you! What do ‘s sound like? October 05, November 29, June 18, June 19, ,