Maybe the divergence comes from some copies, fakes arround? i will make Elliot variable crossover to add a sub to my system, but all the op-amps i can get here seem fake, maybe i'm wrong tho... this are the ones u can get here: https://listado.mercadolibre.com.ar/ne5532#D[A:ne5532]
Price is about 0.6 Us, so...
On the other hand, this opa2134 seem real: https://articulo.mercadolibre.com.a...cking_id=47df63a1-8478-4a03-b371-fb3ec52501b6
But i doubt the devices will match the photo...
JRC 5532 is 30 odd Rupees in India...about 40 US cents retail.
There are Korean and maybe TI versions, IIRC, which are like 25 cents.
It makes no sense to replace them, slew rate and response is good enough for audio.
If you are into sonar, servo drives and such like equipment, then the faster op amps may be useful, or go for digital controls there.
There are Korean and maybe TI versions, IIRC, which are like 25 cents.
It makes no sense to replace them, slew rate and response is good enough for audio.
If you are into sonar, servo drives and such like equipment, then the faster op amps may be useful, or go for digital controls there.
JRC is reputed, NJM5532, some have said it is the best version.
There are many other makers, see the on line sellers' sites.
I really do not see the fuss, but everybody has their conceived notion about op amp rolling.
If the supply is within spec, and the capacitors too, nothing will be achieved by changing out 5532 to 5532, IMO.
No ties to any sellers...
There are many other makers, see the on line sellers' sites.
I really do not see the fuss, but everybody has their conceived notion about op amp rolling.
If the supply is within spec, and the capacitors too, nothing will be achieved by changing out 5532 to 5532, IMO.
No ties to any sellers...
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Because you would need to check the circuit impedances to ensure the end result was lower noise as OPA1612 is bipolar. Both OPA2132 and OPA1642 are JFET.
Not in my experience.I don't know if I got the wrong batch from Mouser in 2015, but the opa2132 proved to be lower noise in a phono preamp.Even if I got it wrong , opa1642 is found only smd , which I personally don't find friendly enough for diy.High temperatures aren't very friendly either to smd chips.. I only have two opa1642 around me...but I can't consider them for high gain low noise preamps.
Thanks for the recomendations 🙂 , actually, I was wondering, i dont recall seeing Noise Vs Zsource in opamps datasheets. In this case, building Elliot's State Variable crossover (project 148), feeded from a DAC with Zout =250Ohm, would that mean a bjt would prob be less noisy? (at least some Jfet datasheets show a high increase in noise at low Rgen).
At the same time, in the article of the aforementioned article, he states: "NE5532 opamps can drive low impedances easily with no increase in distortion, but very low values may cause premature overload. High values cause increased noise, and anything above 10k isn't recommended." . I guess drive refers to the Zload? in this case i'll be arround that value entering to a power amp... Would a jfet opamp help in that respect?
EDIT: just in the next tab JRC njm5532 shows NoisevsZgen and the lower the better, and also now opax134, and same thing. They seem to make the same noise at such Zgen, if i mentally converted that unknown bizarre nv/sqrt(Hz) unit well.
At the same time, in the article of the aforementioned article, he states: "NE5532 opamps can drive low impedances easily with no increase in distortion, but very low values may cause premature overload. High values cause increased noise, and anything above 10k isn't recommended." . I guess drive refers to the Zload? in this case i'll be arround that value entering to a power amp... Would a jfet opamp help in that respect?
EDIT: just in the next tab JRC njm5532 shows NoisevsZgen and the lower the better, and also now opax134, and same thing. They seem to make the same noise at such Zgen, if i mentally converted that unknown bizarre nv/sqrt(Hz) unit well.
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There isn't one for OPA1642 but here's one for a similar noise level part with FET inputs, OPA1656 :
A bipolar opamp has a curve which rises above the resistor noise at higher impedance due to current noise.
Hehehe that makes sense. I think i though it was a voltage noise depending on frecuency, not bandwidth 😆
Nice thread! I got myself some LT1028 to replace two NE5534AP in my Audio Analogue Donizetti Amp.
My first idea was to replace the 5534 with a AD797 but the supply voltages for the opamps are generated through simple Zener shunt regulators with 18V Zener diodes and resistors and the AD797 doesn't like supply voltages that are so high. Reducing the supply voltages for the opamp wouldn't be an option as it would reduce the maximum output power of the amp.
The LT1028 on the other hand is specified up to +-22V in the absolute maximum ratings chart.
My first idea was to replace the 5534 with a AD797 but the supply voltages for the opamps are generated through simple Zener shunt regulators with 18V Zener diodes and resistors and the AD797 doesn't like supply voltages that are so high. Reducing the supply voltages for the opamp wouldn't be an option as it would reduce the maximum output power of the amp.
The LT1028 on the other hand is specified up to +-22V in the absolute maximum ratings chart.
LT1028 has impeccably low voltage noise but very much higher current noise than NE5534. I'd want to check the resistances in the feedback loop (and biassing) weren't compromising the noise performance - LT1028's own voltage noise is roughly equal to that from a 50ohm resistor but if the surrounding components offer a resistance above 400ohm then LT1028 may not be the optimum choice.
I really liked AD8066. It doesn't work well with anything above + and -12V DC, but it did perform and sound exceptionally well.