LM4562 opamp on +\- 18v

Koenjer · 1st June 2011, 08:29 PM

Does any one has some experience with the LM4562 using it on +\- 18v ?

According to some datasheet it´s ratings are +\- 17v.

thanks for the awnsers.

SoNic_real_one · 1st June 2011, 08:52 PM

I wouldn't do it. If the needed voltage is that high, probably you don't need the 4562 (or other low noise) in there...

pdul · 1st June 2011, 09:06 PM

maybe you should use the LME 49860. same circuit, but +/- 22v rating

Koenjer · 2nd June 2011, 08:55 AM

Hi PDul,

good idea, to bad that those are a lot more expensive

I can also swap TL072 with this one isn't it?

pdul · 2nd June 2011, 10:16 AM

The price is not that much higher, But of course depending on how many you need.
The TL072 is rated +/- 18v so no headroom for error in the ps.
Another approach can be to lower the voltage locally to +/- 15v. That will give you a lot
more opamps to choose from.

Koenjer · 3rd June 2011, 08:00 AM

It's an Rotel Surround processor.

The rail is +\- 18v. I'm not willing to change that.
As LPF after the DAC they use TL072 and for outputs NJM5532.

I would like to swap the opamps and upgade some Caps. I think i'm swapping all of these opamps for LME 49860's.

The only downside, there are +\- 24 opamps. But I'm only swapping the output one's. So that leaves me with around 12 opamps.

Mooly · 4th June 2011, 10:46 AM

The OPA2604 is good up to -/+24volts and (IMO) is still one of the best sounding. Its ideal to replace the TLO72 and 5532.

If the Rotel uses -/+18 volts then another possibility is just to alter the regulator arrangement to give < -/+17 volts if you want to try the LM4562.

Andersonix · 7th June 2011, 01:43 AM

OPA1642 is +/-18V "max" (40V absolute max). I'm looking forward to trying these now that I've tasted the LM4562.

stratus46 · 7th June 2011, 03:22 AM

Quote:

Originally Posted by Koenjer

Does any one has some experience with the LM4562 using it on +\- 18v ?

According to some datasheet it´s ratings are +\- 17v.

thanks for the awnsers.

Do you think the manufacturer doesn't know how to use their devices? 36 Volt is the 'absolute maximum rating'. That means your never go there. So don't go there. Build a dual 17 supply and use that. If you want a higher voltage chip then use that.

G²

1st June 2011, 08:29 PM	#1
Koenjer diyAudio Member Join Date: Oct 2009	LM4562 opamp on +\- 18v Does any one has some experience with the LM4562 using it on +\- 18v ? According to some datasheet it´s ratings are +\- 17v. thanks for the awnsers.

4th June 2011, 10:46 AM	#7
Mooly diyAudio Member Join Date: Sep 2007	The OPA2604 is good up to -/+24volts and (IMO) is still one of the best sounding. Its ideal to replace the TLO72 and 5532. If the Rotel uses -/+18 volts then another possibility is just to alter the regulator arrangement to give < -/+17 volts if you want to try the LM4562. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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1st June 2011, 08:52 PM	#2
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	I wouldn't do it. If the needed voltage is that high, probably you don't need the 4562 (or other low noise) in there...

1st June 2011, 09:06 PM	#3
pdul diyAudio Member Join Date: Jan 2009	maybe you should use the LME 49860. same circuit, but +/- 22v rating

2nd June 2011, 08:55 AM	#4
Koenjer diyAudio Member Join Date: Oct 2009	Hi PDul, good idea, to bad that those are a lot more expensive I can also swap TL072 with this one isn't it?

2nd June 2011, 10:16 AM	#5
pdul diyAudio Member Join Date: Jan 2009	The price is not that much higher, But of course depending on how many you need. The TL072 is rated +/- 18v so no headroom for error in the ps. Another approach can be to lower the voltage locally to +/- 15v. That will give you a lot more opamps to choose from.

3rd June 2011, 08:00 AM	#6
Koenjer diyAudio Member Join Date: Oct 2009	It's an Rotel Surround processor. The rail is +\- 18v. I'm not willing to change that. As LPF after the DAC they use TL072 and for outputs NJM5532. I would like to swap the opamps and upgade some Caps. I think i'm swapping all of these opamps for LME 49860's. The only downside, there are +\- 24 opamps. But I'm only swapping the output one's. So that leaves me with around 12 opamps.

7th June 2011, 01:43 AM	#8
Andersonix diyAudio Member Join Date: Jan 2004 Location: Silicon Valley	OPA1642 is +/-18V "max" (40V absolute max). I'm looking forward to trying these now that I've tasted the LM4562.

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