best op amp for C'moy amp

[Dibya]

First of all I am wondering which opamp sounds best .
Please don't recommend any chip that cannot come in SOIC8 or through hole package.

I don't know much about SMD. I cannot solder those chips with no pin.

I heard different op amp sounds different so I want to try some.

 

[saheb11123]

Have you tried the opa2134?

 

[Dibya]

No I haven't tried that.

Thanks added to list.

 

[withmatt]

Try modern OPA1688

 

[Dibya]

I have that in my secret box . Thanks I will try it.

 

[Dibya]

Hi I use TLE2426 rail splitters . For opa1688 should I use one 9v battery or as usewell two 9v battery?

 

[xrk971]

Unless you feel like re-inventing the wheel....

Use two 1688 and just get the nice board from AGDR that handles all the issues of unbalanced rails auto-protect, turn on thump protect relay, etc. 1688 makes a really nice amp. There are just a lot of ancillary supporting components needed to make it a user friendly amp - and might as well make something that sounds better than an O2.

OPA1688 Super CMOY, 2x 9V with real ground and headphone relay - PCBs

 

[Dibya]

Thanks man for reply.

 

[Dibya]

I came back . I want to design something own.
What is different between ±5v and 10v? Pretty stupid question I want to get verified by experts.

 

[xrk971]

With dual rail voltage you can have headphone DC coupled and with single rail you need output capacitor between amp and headphone. Not a bad thing to protect it from DC. Some of my best amps are SE Class A with output cap coupler and single rail voltage supply.

 

[Dibya]

Thanks xrk971

 

[Dibya]

I have made a rough design hope you people will tell me how can I improve it.

 

[Dibya]

My drawings skills aren't good.

 

[Dibya]

I want to call it speonix as it born from ashes of cmoy amplifier.

 

[Dibya]

I made this amp . The design is super flop . Grounding is the issue.

 

[xrk971]

Skip the voltage regulator and tie midpoint of two batteries to GND. Why are you using inverting amp? Add RFI filter on input, lots of good x7r bypass caps next to legs of opamp. Use two 2200uF 5v caps back to back for 10v bipolar outpt cap bypass with 2.2u MKS. Add 270R load to output to absorb and dissipate turn on DC transient. Add 0.1uF film and 4.7R Zobel to absorb any RF oscillation.

Basically looks like this. Give it a try.

Note that larger value or larger voltage rating input or output caps can be used, I just tried to keep parts as small as possible.

If you don’t have carbon film use metal thin film for now. Feedback cap can be NP0 or MKP/FKP but not X7R.

 

[Dibya]

Thanks man thanks a lot.

 

[Dibya]

I don't know where to get 2200uf 5v cap . I tried digikey but no luck . My local retailers don't know about it. Seems to tough to find rare components.p

 

[lineup]

Try getting 2200uF/ 10 Volts or 20 Volts or even 30Volts
It does not matter if is more than 5V

 

[Dibya]

I have some nichicon ufg 2200uf 25v.
Volt does matter in cap's. I have seen different Voltage sounds different. Even different caps has different sound.