Line out distribution

[Precious Molina]

my soundcard line out is 200 ohm, i need to splitt it into 10 with individual pots
4x active monitor speaker
6x headphone preamp

is this doable

 

[KlausST]

Hi,

it will work.

but...

***
A few comments:
* 10u and 100u capacitor in series to the aoudio signal line is critical. Don´t use standard electrolytics. Use special low noise audio bipolar electrolytics, or - if you want to spend that money - use film capacitors.

* the direct output form the pot to the active monitor speakers: in center position you have the highest output resistance of 5kOhms. Combined with a (long)cable capacitance you will recognice an attenuation of high frequencies.

* NE5534 are stable with a gian >=3. They are not stable at unity gain, or gain of 2!

* the high input bias current of the NE5534 will produce a noticeable output DC voltage (first stage, 100k input, gain of 2, 500nA --> 100mV !!!)

* i´d perfer a single OPAMP(or dedicated headphone Amp) instead of paralleling two OPAMPs.

Klaus

 

[Audioguru]

It looks like the NE5534 is too old for your circuit.

 

[Precious Molina]

the monitor must be linear, im going to use it in small studio
can back to back electronlytic sub to bipolar?
i have tl072, opa2604 but its soic am gonna convert it to dip if its worth

Combined with a (long)cable capacitance you will recognice an attenuation of high frequencies.

i will run it to 3 meters, i need flat up to 16khz, im gonna use pots low to high level

NE5534 are stable with a gian >=3. They are not stable at unity gain, or gain of 2

i thought opamp was best at unity, by the way i gonna change my feedback to 20k

the high input bias current of the NE5534 will produce a noticeable output DC voltage (first stage, 100k input, gain of 2, 500nA --> 100mV !!!

i dont understand, but my pwero supply is bipolar -/+9 volts 500mA regulated by 337 and 317

i´d perfer a single OPAMP(or dedicated headphone Amp) instead of paralleling two OPAMPs.

can he drive heaphone? im just want volume in headphone even its is not linear or good

It looks like the NE5534 is too old for your circuit

living in the 3rd world country is adding the problem

 

[KlausST]

Hi,

can back to back electronlytic sub to bipolar?

Yes, but especially this is a bad solution is you use standard electrolytics instead of high quality audio components.

can he drive heaphone? im just want volume in headphone even its is not linear or good

:?: Yes, a dedicated headphone amp can drive headphones. ;-) , or you use an OPAMP with high current drive ability.

i dont understand, but my pwero supply is bipolar -/+9 volts 500mA regulated by 337 and 317

The bias current of the OPAMP and the resulting DC at the output has nothing to do with your power supply.

Klaus

 

[Precious Molina]

what if i remove all capacitor? and change the 100k inputimpedance to 10k
and change to unity gain using ne5532 then 1k potentiometer

 

[KlausST]

Hi,

All you wrote will improve performance.

To minimise output offset voltage caused by bias_current you should use same DC resistance at both opamp inputs.

A DC blocking filter at the input may be useful.

Klaus