OPA1632D + LME4562

[merlin el mago]

I have four OPA1632D + one LME4562, could you suggest any schematic for headphones amp load 300 ohms Senns HD650?

 

[theAnonymous1]

Have you thought about a simple "CMOY" type non-inverting circuit using the LM4562?

 

[merlin el mago]

Thank you, could you post schematic? I saw one headphone CMOY in the swap meet...

 

[merlin el mago]

Bump

 

[qusp]

cmoy is very simple, not at all that great sounding regardless of the chips used. you have some nice chips there, I would forget about the LM and use the 1632s in a balanced build, you have balanced source, I know that, you could basically use a modified IVY schematic without the filter. is this to go after the D1?

 

[qusp]

TBH a 300ohm load is not a difficult one, any of your IV s6ages will drive them just fine, so I dont think you actually need to build this, use them for something else. unless you want it to be portable

 

[merlin el mago]

Thanks qusp, I have theses chips for IVY replacement but I sold the IVY & now I would like to profit the chips so is the reason taht I am looking for in other application.

 

[qusp]

well the IVY circuit is a good place to start. but there is also the SUSY circlotron that uses the 1632 and some fets, not such an easy build, and too high power for headphones, but you could modify the output devices to use lower powered jfets or something. I have a few schematics around somewhere that use this chip so i'll see if I can dig them or the links out for you. i'm pretty hectic here at the moment, so might take me a day or 2

 

[merlin el mago]

thanks for answer, don't worry qusp, I'm not interested in IVY because I owned one & I sold (I like more my Erno Borbely I/V), it's only to do something with these chips that now I don't use, I have patience.

 

[qusp]

yes I have enquired about getting the all fet borbely IV or headamp before he shuts down, but I think I rather get some of his super shunts as i have enough IV stages already and the top of the line IV with power supplies is very expensive. so I put the order in for the high current shunts just yesterday i'll have a dig around for you and get back when I can