Tweakers' Asylum

RE: how do you convert an amplifer into a preamplifier

199.82.243.71

In Reply to: RE: how do you convert an amplifer into a preamplifier posted by JohnMahler on May 06, 2008 at 04:19:14

On guitar amps it is common to use a high value resistors to sample the signal for a line out. From the positive speaker terminal, use a 68K resistor and a 4K resistor in series to ground. Take the signal off of the junction between the two resistors. The resistance is high enough that the power amp will not push any current, 1/2 watt resistors will work fine. It will cost you $0.20 to see if it is the solution you are looking for.
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Long Live Dr.Gizmo

Follow Ups:

Who wants a high distortion guitar amp? - cheap-Jack 08:38:06 05/06/08 (7)
- This approach does not create distortion. It is how you get the signal to powered subwoofers - Chris O 08:53:58 05/06/08 (6)
  - Guitar amps're built to add distortion to please the guitarists. - cheap-Jack 09:20:23 05/06/08 (5)
    - Can't disagree, just answering the guy's specific question (nt) - Chris O 11:46:13 05/06/08 (4)
      - RE: Can't disagree, just answering the guy's specific question (nt) - JohnMahler 00:23:47 05/07/08 (0)
      - If you can DIY.. - cheap-Jack 12:19:50 05/06/08 (2)
        
        RE: If you can DIY.. - JohnMahler 00:25:36 05/07/08 (1)
        
        Mainly distortion, plus noise & hum etc etc etc. (nt) - cheap-Jack 07:19:44 05/07/08 (0)

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