Ne5532 Op Amp real world max voltage?

sounder · 23rd October 2003, 03:59 AM

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

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

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

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....

23rd October 2003, 03:59 AM	#1
sounder diyAudio Member Join Date: Sep 2003 Location: Toronto	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 Am I really pushing it this time? Thanks, David

23rd October 2003, 02:35 PM	#8
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	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... __________________ It's only audio

23rd October 2003, 03:28 PM	#10
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	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.... __________________ It's only audio

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23rd October 2003, 10:36 AM	#2
DRC diyAudio Member Join Date: Jan 2003 Location: UK (south west)	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

23rd October 2003, 12:16 PM	#4
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	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.

23rd October 2003, 01:15 PM	#6
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	No, it is probably OK then.

23rd October 2003, 02:51 PM	#9
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	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.

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