JRC5534 - different pinout from CA3130?

[HamishR]

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?

 

[jesuscrisp]

You wouldn't need a compensation cap for either really.

 

[finebyfine]

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

 

[jesuscrisp]

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.

 

[HamishR]

Thanks guys! Still wondering about the pinout but that's ok!

 

[Silver Blues]

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.

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.

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

 

[music6000]

Available at Altronics

NE5534N Op. Amplifier Low Noise - Altronics

NE5534N Op. Amplifier Low Noise. Check website for full details at Altronics.com.au

www.altronics.com.au

 

[Feral Feline]

Thanks guys! Still wondering about the pinout but that's ok!

I'm not really answering your question, but I hope this helps get you there...





The datasheets were quick and easy to find:

JRC5534 from Alldatasheet.com​

​

Texas Instruments NE5534 from TI.com​

​

Renesas CA3130 from Renesas.com​

There's also the pinout from ...

Intersil CA3130 from DatasheetQ.com​

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

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