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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Change or replace a LM358 with a NE5532
Change or replace a LM358 with a NE5532
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Old 24th October 2017, 12:38 PM   #1
leosep is offline leosep  ominican Republic
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Default Change or replace a LM358 with a NE5532

Hi, how are you all?

I have 2 of the velleman k1803: https://www.velleman.eu/downloads/0/...k1803_rev2.pdf

Can i replace the LM358 with a NE5532 to lower the noise or hiss without replacing any other component?

I'm powering one with 12v dc and the other one with 22v dc.
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Old 24th October 2017, 01:15 PM   #2
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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Yes but a TL072 would be even quieter according to the Ti data sheet; http://www.ti.com/lit/ds/symlink/tl072a.pdf
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Old 24th October 2017, 01:19 PM   #3
leosep is offline leosep  ominican Republic
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But i think the TL072 will not fit the velleman k1803 without modifications.
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Old 24th October 2017, 01:53 PM   #4
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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TL072 is the same case and pin out as 358 and 5532.
http://www.ti.com/lit/ds/symlink/lm158-n.pdf
http://www.ti.com/lit/ds/symlink/tl072a.pdf
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Old 24th October 2017, 02:11 PM   #5
leosep is offline leosep  ominican Republic
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Oh thanks. Can i power the TL072 with 10-30VDC?
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Old 24th October 2017, 02:33 PM   #6
epicyclic is offline epicyclic  United Kingdom
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I think the NE5532 will be quieter . The noise on the input buffer will be dominated by the 100K series resistor then the lower voltage noise of the NE5532 will excel in the second amplifying stage. Just put a 0.1uF ceramic capacitor across the voltage supply pins of the pcb board to assist stability ...........just my thoughts............try both and have a noise shoot out .

Last edited by epicyclic; 24th October 2017 at 02:54 PM.
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Old 24th October 2017, 02:43 PM   #7
leosep is offline leosep  ominican Republic
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Thanks, can i still use 10-30v with NE5532 and TL072?
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Old 24th October 2017, 02:54 PM   #8
epicyclic is offline epicyclic  United Kingdom
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YES


PS ....please report back on your results

Last edited by epicyclic; 24th October 2017 at 02:56 PM.
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Old 24th October 2017, 02:55 PM   #9
leosep is offline leosep  ominican Republic
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Thank You Very Much, im buying the ICs now.
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Old 25th October 2017, 01:16 AM   #10
PRR is offline PRR  United States
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Quote:
Originally Posted by leosep View Post
....velleman k1803.... lower the noise or hiss....
That design is TERRIBLE for low-hiss work.

Not the chip-- the 100K input resistor.

Find a different kit or roll your own.
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