PGA2310 & NE5532 get hot? - diyAudio
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Old 18th December 2005, 07:40 AM   #1
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Default PGA2310 & NE5532 get hot?

Hello,

I built a small test circuit using a PGA2310 and a NE5532 input buffer. The analog part of the PGA2310 and the NE5532 are powered with +-15V using LM317/LM337.

When I touch the NE5532 it gets pretty warm, tha PGA2310 gets hand-warm.

Is this behaviour normal?

Thanks in advance,
Serge
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Old 18th December 2005, 08:28 AM   #2
Netlist is offline Netlist  Belgium
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A schematic would be handy, if possible.

/Hugo
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Old 18th December 2005, 09:24 AM   #3
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Sure,

attached is the schematic of the PGA and NE5532 part.

R3 & R6 are marked 0 and R4 & R7 nc (not connected), because I currently let the NE5532 run without any gain.

SV3 is the "bus" connector to the atmel controller. SV1 is the output bus for daisy chaining with a 74hc595.

Thanks !
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Old 18th December 2005, 09:27 AM   #4
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And here is the PSU attached.

Nothing fancy at all :-)
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Old 18th December 2005, 10:09 AM   #5
Netlist is offline Netlist  Belgium
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Much depends on the environment and the definition of warm and hot.
Looking at the datasheet the dissipation is 1200 mW max.
I nothing is oscillating, I would believe this is fairly normal.

/Hugo
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Old 18th December 2005, 10:40 AM   #6
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Hmm ... oscillation, that may be it ... I have to admit I have no bypass caps on the 5532, shame on me.

On another thread I read that a small series resistor may be needed on the output of the opamp too.

I did not assume oscillation because the sound is not distorted.

Thanks for the hint anyway. I'll rework my design and improve the buffer stage,

Sorry for the newbish questions ;-)

Bye,
Serge
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Old 18th December 2005, 07:51 PM   #7
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Just because it doesn't sound distorted.............

Get your 'scope out. Hope you have one. "Sounds" like you will need it.

(Sorry.......that was too obvious a pun to pass by.)

Jocko
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Old 18th December 2005, 08:12 PM   #8
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Hi,
Sorry .. I'm a pretty newbie at this. I put bypass 100n caps from the supply pins to ground as well as 250Ohm resistors on the output. Well, the ne5532 still gets warm.

I do not have a scope unfortunately. Is there any other method of detecting oscillation?

Thanks,
Serge
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Old 18th December 2005, 08:39 PM   #9
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A trick might be to calculate the power consumption at idle and look if it's within specs. If not…
Also, assuming you have taken the necessary precautions to prevent the circuit from oscillating you could be on the safe side.
But then again, you are never sure without a scope. Ebay might be your friend for your next investment.

/Hugo
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Old 20th December 2005, 10:52 AM   #10
alfsch is offline alfsch  Germany
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5532 gets warm, thats normal...30..35°
and the sound? idle noise?
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