JRC5534 - different pinout from CA3130?

H

HamishR

Well-known member
I'm thinking of building a Hen's Tooth Distortion which calls for a JRC5534. As it's a single op-amp chip I thought maybe I could use a TL071 or CA3130. But looking at the schematic it looks like the compensation cap goes between pins 1 and 5. So do I need to buy a JRC5534 which I will probably only ever need for this circuit? Or could I use a CA3130 and just solder the compensation cap on the underside of the board across pins 1 and 8? Or will this cause the world to explode?
 
The 1nf compensation capacitor is lowering the slew rate a ton here. Not sure how critical it is to the sound of the pedal but because of that I’d try single op amps you might use in a Rat like the LM308, OP07, 741, etc if you have on hand
 
Last edited:
I repeat, neither TL071 nor CA3130 have compensation pins. just leave the cap unsoldered.
There's also the easier to find NE5534 which would be a more direct JRC5534 replacement.
 
jesuscrisp said:
I repeat, neither TL071 nor CA3130 have compensation pins. just leave the cap unsoldered.
There's also the easier to find NE5534 which would be a more direct JRC5534 replacement.
Click to expand...
Uh, what? The CA3130 definitely has compensation pins? Slew-rate limiting of the 3130 via compensating capacitors is a cornerstone of Bjorn Juhl's circuits (and several other well-known circuits, I've even designed one that uses this). It's not needed for proper function of the circuit in these cases but it does have a significant effect on the sound.
1724293049502.png
Anecdotally however, I once played around with a 3130 gain stage with a 1nF compensating capacitor and it went from not much at low gain to a ripping square wave fuzz very fast - perhaps not what you're going for here 😂
 
HamishR said:
Thanks guys! Still wondering about the pinout but that's ok!
Click to expand...
I'm not really answering your question, but I hope this helps get you there...

JRC NJM5534 PINOUT.png

TI NE5534 PINOUT.png
RENESAS CA3130 PINOUT.png
The datasheets were quick and easy to find:

​
​

There's also the pinout from ...


From my RAT files:

OP07DP (Modern stock RAT op-amp; Slew Rate: 0.3 V/μs

LM308 (Most widely loved RAT op-amp; Slew Rate: 0.3 V/μs

TL071 (A favorite amongst modders); Slew Rate: 13 V/μs

TL061 (Slightly different spec TL071); Slew Rate: 3.5 V/μs

Burr Brown OPA134 (Common hi-fi op-amp); Slew Rate: 20 V/μs

NE5534 (Not as popular as the TL071 or the LM308, but still has its fans amongst RAT users); Slew Rate: 13 V/μs

AD797 (Incredibly expensive hi-fi op-amp); Slew Rate: 20 V/μs
Click to expand...



Further Rat Files info re compensation caps...

Model Compensation Cap


CA3130 33–100p


CA3140 33–100p


LM741 None


LM301 30 (datasheet) | Less gain, mellower, “less aggressive”, “darker” — so might be good for bass. Some think it sounds fantastic in a Rat
“Same for CA3140. But the CA3130 is a lot more gainy in the mids and highs.” USE 100pFd to 300pFd compensation cap


LM308 30pF


NE5534 22pF? | This is the chip Jack Orman prefers “AMZ Fat Rat - Modifying the ProCo Rat”


OP07 OPTIONAL* Comp-cap not needed, but use 30-100p to make it sound like a Rat. (higher slew rate than 308)


TL071 None


AD797 Amazing IC.also sounds very good in a Rat, though they're very pricey.


TLE2071. If you want something a little less expensive than AD797, but in the same realm, possibly even better for rat types, try TLE2071

TL070 180pF
Click to expand...
 
You must log in or register to reply here.
Back
Top