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-   -   Ne5532 Op Amp real world max voltage? (http://www.diyaudio.com/forums/parts/21851-ne5532-op-amp-real-world-max-voltage.html)

sounder 23rd October 2003 03:59 AM

Ne5532 Op Amp real world max voltage?
 
I've built an active subwoofer filter using a NE5532P op amp and my rail voltages are +22V/-22V. I haven't connected the PS to the board yet. I know some chips have higher tolerances than specified. Anyone overvoltaged (a word?) this chip and survived:hot: Am I really pushing it this time?

Thanks,

David

DRC 23rd October 2003 10:36 AM

According to the data sheet I saw (RS web site) this chip is rated for supply to +/- 22 v so you are within spec ...

(another) Dave

sounder 23rd October 2003 12:12 PM

Quote:

Originally posted by DRC
According to the data sheet I saw (RS web site) this chip is rated for supply to +/- 22 v so you are within spec ...

(another) Dave


Thanks Dave, I'm firing her up
David :cannotbe:

Christer 23rd October 2003 12:16 PM

Check first that you rails really are at +/-22V, unless you have
already done so. I just mean, if the PSU is designed to give that
voltage, it will also have a tolrance and may give a higher
voltage.

sounder 23rd October 2003 01:11 PM

Quote:

Originally posted by Christer
Check first that you rails really are at +/-22V, unless you have
already done so. I just mean, if the PSU is designed to give that
voltage, it will also have a tolrance and may give a higher
voltage.


+/- 22V is the actual voltage. I noticed the op amp pec is 22V maximum. Do you think that will be an issue.

It's easier to buy a smaller transformer than desolder the op amp:D

Christer 23rd October 2003 01:15 PM

No, it is probably OK then.

sounder 23rd October 2003 01:21 PM

Quote:

Originally posted by Christer
No, it is probably OK then.

Thanks for the input
David

jean-paul 23rd October 2003 02:35 PM

It is unwise to run components at their absolute maximum ratings. You are NOT running it within specs as another member posted, you'll be running it at absolute maximum. So no safety margin. Check datasheets and draw conclusions please. Most critical will be power on sequence when voltages might be higher than +/- 22 V for a short ( but effective ) while. This will certainly be the case if you have a unregulated supply and it will occur with regulators too in a smaller degree.

I would lower the voltage to + and - 21 or 20 V just to be safe on the long term. You've been warned anyway...

Christer 23rd October 2003 02:51 PM

Jean-Paul
You are right, of course, and if it had been a new design, still
on paper only, I would have advised against using 22V.
Running them at the max limit, not over mind you, will probably
only give a slightly increased risk of failure. As I understand it,
the guy already has built this thing, so considering these op
amps cost next to nothing to replace, should they fail, I doubt
it is worth rebuilding the PSU.

I might be wrong, though.

jean-paul 23rd October 2003 03:28 PM

Only 2 diodes can be enough. I'd prefer a more elegant way though.

Changing/adapting the PSU will be cheaper than replacing a burnt subwoofer....


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