Tascam headphone amp

[Kir_For_Pleasure]

Have stagrounded my m3500 console and it got very silent..very happy about that.

What i forgot was to include the headphone section for the new ground so it have been very noisy.

So now i have  taking it apart and are about to make the grounding for the headphone amp.

I know they are some very talented guys here with knowledge in circuites.

Do you have some suggestions for decoupling or even some mods for sweetnes in the attached ciruite ?

https://drive.google.com/open?id=0B2AdteJUCk4OaEhiVHVFTjMyS0E

 

[PRR]

An LM386 headphone amp? (Even if NJM?)

It is what it is. A GREAT strong un-killable power amp for a dollar.

However it was aimed at pocket AM radios, retired into dial-up modems, and never the best audio path. IMHO, later models were tuned for low idle current not best sound.

Cut after the pots and run out to a GOOD headphone amp. There's a bazillion plans on the interwebs.

 

[JohnRoberts]

The classic mistake made in console headphone amps by junior engineers is not accounting for the headphone ground current. If the PCB layout treats that HP ground like just any other ground in the master section, the heavier current from low-mid impedance headphones will corrupt the grounds with IxR voltage build up. More of a signal crosstalk and contamination issue than noise.

JR

 

[PRR]

> not accounting for the headphone ground current.

Another reason to go-around the chips and run an external amp.