mxr microamp vs amz mosfet booster

[mr_deadmaxxx]

can anyone tell me which gives more dB gain at 9V operation?

OT: can I use a dual microamp as a preamp for this tda1554 ic?

I found this schematic for a stereo 22 watt per Chanel amp.

http://www.aaroncake.net/circuits/amp20w.asp

I was wondering if this would work for a guitar amp.

Thanks for your comments.

[roseblood11]

If you want to use it as a guitar amp, why don't you build a more amp-like preamp? Maybe one of the projects at runoffgroove or a Catalinbread overdrive?

If you really prefer a clean booster, I have two other suggestions:
http://forum.musikding.de/cpg/albums/userpics/23524/Boss_FA-1_vero.gif
http://forum.musikding.de/cpg/albums/userpics/23524/mr_442_booster_-_final.gif

But all of these boosters would be able to drive the "amp20" into distortion, which will sound horrible...

[petemoore]

  THe breadboard answers these kind of questions with huge instant info responses.
   What is driven harder by a preboost will distort-more under the load [except in rare cases where there is so much clean headroom 'down the chain-line' in every stage which will deal with the hotter input...to not enter distortion]...ie expect to hear distortion increase even with or especially with a very clean hot boost.
  The speaker distorts anyway, pushing harder on an input or driving an output to push more current will almost invariably change the tone, leaning toward some or much more distortion.
   After...many discover the benefits of NOT overdriving any 1 input say, past 'x' hotness, so as to cause slight distortion over a number of stages [for sure you have speaker and amp stages + whatever else]...but there are exceptions to every rule of tone aquisition. One exception might be when feeding a distorter box with clipping characteristics [the output being 'clamped' below 'X' output level by say clipping diodes], pushing a distorter box with a boost increases the distortion but might not cause 'ugly artifacts' [or they're covered up by the more aggressive wave reshaping of the clipping]...
   Yupp, but I used a lot of 'perfbreading' to experiment but have these experiments on a solid board...starting with the high resistor value and piggybacking a resistor parallel to find what the small value 'in this position' might sound like...same thing with capacitors...by leaving lead exposed above the board, parallel additions to reduce resistance or increase capacitence is a matter of just adding parallel component to the fixed-in value. To reduce a capacitence by adding a capacitor...leave room to splice-in a series capacitor [or use the offboard wire of input/output to do the same]. Consider a trimpot or pot to find 'this' or 'that' value such as correcting biasing R value for the drain of a Jfet.

[mr_deadmaxxx]

the say the mxr micro amp gives a much more cleaner boost..

[Mark Hammer]

They will both run out of headroom PDQ.  Why don't you consider using a voltage multiplier like the MAX1044 to provide a higher supply voltage, that will permit higher gain without clipping?  http://geofex.com/circuits/+9_to_33.htm

[roseblood11]

They will both run out of headroom PDQ.  Why don't you consider using a voltage multiplier like the MAX1044 to provide a higher supply voltage, that will permit higher gain without clipping?  http://geofex.com/circuits/+9_to_33.htm

That's why I linked to my version of the MXR CAE MC-401...