Search found 4 matches

by hellalive
Tue Jun 14, 2022 7:46 am
Forum: Pro Audio Design
Topic: Balancing Resistors Reduce Voltage Follower Common Mode Distortion
Replies: 11
Views: 23004

Re: Balancing Resistors Reduce Voltage Follower Common Mode Distortion

Looks like everything is workign as expected with the 2134. I have to add to my previous postings that the LM4562 has actually more current noise than the 5532, and talking noise alone I bet the 5532 would perform better in a MM preamp, and maybe a FET opamp even better, but I also have to say I'm n...
by hellalive
Mon Jun 13, 2022 8:11 am
Forum: Pro Audio Design
Topic: Balancing Resistors Reduce Voltage Follower Common Mode Distortion
Replies: 11
Views: 23004

Re: Balancing Resistors Reduce Voltage Follower Common Mode Distortion

Very informative, thank you.

Yes, LM4562 are EMI-prone, and need proper filtering, but I never had very big issues with them - never used in phono preamps tho; they are not suited to high impedance circuits anyway.

I have to try some NJM2068 i guess :)
by hellalive
Mon Jun 13, 2022 6:50 am
Forum: Pro Audio Design
Topic: Balancing Resistors Reduce Voltage Follower Common Mode Distortion
Replies: 11
Views: 23004

Re: Balancing Resistors Reduce Voltage Follower Common Mode Distortion

I'd reccomend an OPA1642 over a 2134 if you could still buy them right now, but it seems they'll be out of stock for quite a long time. LM4562 can work well, if you keep the input impedances low enough - usually gives an audible improvement over the 5532 in all circuits, with proper PS decoupling. O...
by hellalive
Mon Jun 13, 2022 3:06 am
Forum: Pro Audio Design
Topic: Balancing Resistors Reduce Voltage Follower Common Mode Distortion
Replies: 11
Views: 23004

Re: Balancing Resistors Reduce Voltage Follower Common Mode Distortion

You'll have much higher impact inserting this resistor in a FET-input opamp voltage follower circuit. With an NE5532, it doesn't make as much impact - distortion figures are very low anyway. This is also what Self writes in his book.