Speaker Line Out - Electronic Circuits Projects Diagrams Free

tonyc6765 · 29th October 2003, 05:00 AM

I would like to build a simple box that takes an amplified speaker out and reduces it to a line level out. The amplified signal will be coming from a guitar amplifier. The line level out needs to be the signal only, no amplification. I am a novice at this, so please keep it simple and in layman terms if possible. Thank you for your response.

TonyC
tonyc6765@hotmail.com

crust · 29th October 2003, 03:59 PM

By line level, if you are referring to the RCA type inputs on a pre-amp, a simple voltage divider will work, though you could go purchase a specially built and packaged device to do this. The inputs are normally rated at 500-1000 mVrms. If you are driving it with an amplifier with a 50W into 8ohm output, you would have 20Vrms. To reduce that to 1Vrms, you could build a divide by 20 resistor network that contains just a series resistor of maybe 1k and a parallel resistor of around 20 ohms or so (not quite /20, but close enough). You should still determine the power requirements of the resistors.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

29th October 2003, 05:00 AM	(permalink)
tonyc6765	Speaker Line Out I would like to build a simple box that takes an amplified speaker out and reduces it to a line level out. The amplified signal will be coming from a guitar amplifier. The line level out needs to be the signal only, no amplification. I am a novice at this, so please keep it simple and in layman terms if possible. Thank you for your response. TonyC tonyc6765@hotmail.com

29th October 2003, 03:59 PM	(permalink)
crust	By line level, if you are referring to the RCA type inputs on a pre-amp, a simple voltage divider will work, though you could go purchase a specially built and packaged device to do this. The inputs are normally rated at 500-1000 mVrms. If you are driving it with an amplifier with a 50W into 8ohm output, you would have 20Vrms. To reduce that to 1Vrms, you could build a divide by 20 resistor network that contains just a series resistor of maybe 1k and a parallel resistor of around 20 ohms or so (not quite /20, but close enough). You should still determine the power requirements of the resistors.