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Old 2nd June 2011, 05:31 PM   #1
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Unhappy Help me replacing a (they dont have that) op ic

i wanna know if ne5534 could be replaced wth any other single opamp such tl071 or tl061. the thing that gives me doubts is the pin 5 and 8 of ne5534. if i use a dual opamp or a quad opamp instead what happens. is there a problem or what???

you may get more info of what im saying from this link (figure 4 and 6 and 7):
Audio Mixing Console - Part 1
thanx...
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Old 2nd June 2011, 05:34 PM   #2
tomchr is offline tomchr  United States
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The NE5534 is an externally compensated single op-amp. You can replace it with any single op-amp such as LME49710 if you leave pins 1, 5, and 8 disconnected. Either cut the pins off the op-amp, cut the board traces leading to those pins, or pull the components connected to those traces.

~Tom
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Old 2nd June 2011, 06:43 PM   #3
macboy is offline macboy  Canada
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Despite the nay-sayers, 5534 is quite good, better than 5532, which is itself quite good. Certainly far better than the ancient TL071. Also the 5534 is bipolar input and TL071 is JFET. If I was designing the circuit originally, it would be different for each opamp based on this. It follows then that simply dropping one in place of the other isn't necessarily a good idea. This is especially true in this circuit where the input impedance has been carefully matched to the characteristics of the NE5534 (input current noise, input voltage noise, input impedance, etc.) in order to minimize noise. Switch to a FET input and all bets are off.

edit: Digi-key has a TI-made NE5534A in DIP

Last edited by macboy; 2nd June 2011 at 06:51 PM.
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Old 2nd June 2011, 06:56 PM   #4
Mooly is online now Mooly  United Kingdom
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Good advice in the above two posts...

my thoughts for what they are worth,
fig 3 which you didn't mention... stick to the NE5534 unless you want to tweak the circuit to work with some newer bipolar device but not an FET device if you want the best noise performance.

fig 4,6 and 7. You could use something like the OPA134 or OPA604 and just omit the compensation cap used for the 5534's but noise will be worse.

Again my thoughts... noise (white noise) is to me one of the least of concerns because the noise levels are so small anyway at line level.

The big problem with the TLO71 is the limited output drive compared to newer devices.
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