MP3Car.com - View Single Post - FAQ: Connecting your soundcard to a Volkswagen Monsoon Amp

evandude · 03-05-2006, 09:28 AM

Just a thought... but you should be able to achieve the same +6v offset using capacitors instead of the bulky, expensive ground-loop isolator.

I just put this circuit together in a simulator and it seems to work, and the distortion seems to be pretty low... with a 5KHz signal through it, distortion was 110dB or more down... and increasing the value of the caps a little more would make it even better. I would be willing to bet that it has better frequency response than the transformer in the ground loop isolator, anyway. (this represents one channel... RCA output would be taken across the resistor terminals, with the ground terminal being the one at the regulator output, and V1 represents the RCA input)

I don't have a monsoon amp, but maybe someone else would be willing to try this out. total parts cost is less than $1, minus the regulator circuit, or maybe a few bucks at radio shack prices.

03-05-2006, 09:28 AM	#9
evandude FLAC evandude's CarPC Specs Join Date: Mar 2005 Location: Maine Vehicle: 99 Jetta Wolfsburg Posts: 937 My Photos: ()	Just a thought... but you should be able to achieve the same +6v offset using capacitors instead of the bulky, expensive ground-loop isolator. I just put this circuit together in a simulator and it seems to work, and the distortion seems to be pretty low... with a 5KHz signal through it, distortion was 110dB or more down... and increasing the value of the caps a little more would make it even better. I would be willing to bet that it has better frequency response than the transformer in the ground loop isolator, anyway. (this represents one channel... RCA output would be taken across the resistor terminals, with the ground terminal being the one at the regulator output, and V1 represents the RCA input) I don't have a monsoon amp, but maybe someone else would be willing to try this out. total parts cost is less than $1, minus the regulator circuit, or maybe a few bucks at radio shack prices. Attached Images __________________ But don't take it from me! here's a quote from a real, live newbie: Quote: Originally Posted by Viscouse I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it. eegeek.net Last edited by evandude : 03-05-2006 at 09:57 AM.