Suggestions for Pro-Audio Line Splitter Circuit

Discussion in 'The Projects Forum' started by jackfish, Jul 17, 2008.

  1. jackfish

    Thread Starter New Member

    Jul 17, 2008
    My initial thinking is that a good quality transistor with unity gain using (2) 9V batteries (18V) for headroom would make an ideal line splitter for a guitar. Am i on the right track here? I want to achieve lowest coloration of sound and lowest S/N. I would think the transister solution would be better than an op-amp solution? Those with audio experience, what transister would you recommend for the job? Perhaps there is a circuit diagram available?

    Thank you.
  2. Audioguru

    New Member

    Dec 20, 2007
    A splitter? You mean the output must feed many amplifiers?
    An emitter-follower transistor can feed a few high input impedance amplifiers and will have some distortion.
    A good opamp can feed many amplifiers and has very low distortion.
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    What about vacuum tubes?
  4. SgtWookie


    Jul 17, 2007
    A TL071, TL072 or TL074 has 0.003% THD, with noise in the nanovolts.

    You could take a TL074, connect them all as unity gain buffers, use one of them as an input to drive the other three. You'd double your THD to 0.006%, but that's likely tolerable - and each of the three outputs would be independent of the other; free to respond to their individual load. You wouldn't load your input signal, either.

    If you need less noise, look at an LT1007.
  5. Externet

    AAC Fanatic!

    Nov 29, 2005
    Exactly what equipment is intended to be fed by the electric guitar ?

    If one of them is a 'normal' amplifier; it would be better to use its preamplified output to feed a second.

  6. jackfish

    Thread Starter New Member

    Jul 17, 2008
    The split signal will feed (2) line inputs, one will be the side chain in for a noise gate, the other into a guitar/amp modeler effects processor. If op-amps is the way to go, i guess the MXR KFK-1 EQ pedal i am using now (has two outputs) is good enough. I may inquire with the manufacturer and ask how i can jump/bypass the EQ stage and just have input --> volume --> output. For some reason, i thought a simple transister would provide superior performance over an op-amp.