Re: Balance Audo Circuit



On 4/4/07 9:02 AM, in article
1175702556.638289.281400@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, "Astro"
<edge5757@xxxxxxx> wrote:

On Apr 4, 9:32 am, Eeyore <rabbitsfriendsandrelati...@xxxxxxxxxxx>
wrote:
Astro wrote:
The output of the balance circuit would also be 4-wire audio.

What exactly do you mean by 4 wire audio ?

I need a circuit that will match impedance of 600 ohms both both input & the
out put.

Telecoms ? 600 ohms is no longer used for audio outside of that specific
area.

Graham

RS232 will be used for the line which of course os 600 ohm. This is
not being used with telco equipment but with LMR (Land Mobile Radio)
equipment.



RS232 is not an audio spec; it's for digital signals.

Are you trying to build a "phone patch."


Don

.



Relevant Pages

  • Re: History Lesson: 600 ohm balanced line
    ... But since telephony audio was never transmitted over ladder line, ... inches is about 600 Ohms. ...
    (rec.audio.pro)
  • Re: Left speaker wont work.
    ... Have tried 2 different sound cards. ... Have tried 3 different sets of speakers. ... audio device, that claimed a low value of 1 ohm. ... be equal to or even higher than 8 ohms. ...
    (microsoft.public.windowsxp.hardware)
  • Re: How to electronically put a telephone line "off-hook"
    ... To seize the telephone line you need ~200 Ohms across the conductors. ... The 600 Ohm transformers are to sort of near match the AUDIO impedance ... Ohm audio output transformer winding in SERIES with ONE of the telco ...
    (sci.electronics.basics)
  • Re: The decibel
    ... The characteristic impedance of the twisted pair cable is actually around ... ohms and DSL circuits operate at this impedance. ... higher than that of cables, as you say, that is far from the entire ... this discussion concerns the characteristic impedance at audio ...
    (rec.audio.tubes)
  • Re: connecting PC to TV
    ... signaling the condition of the line. ... > Both go missing in the passive balun system we were talking about ... > I was expecting a balun to transform the kilo-ohms audio signal ... They are usually capable of driving baluns that are, say, 600 ohms. ...
    (comp.dcom.cabling)