Does anyone have a genuine mxr micro amp?

[tehfunk]

If so, can you take pictures of the component side of the circuit board, I can't seem to find pictures of the micro amp circuit board anywhere, just the schematic. BTW, I just wanted to see it out of curiosity. The pictures would be much appreciated! Thanks!

[Auke Haarsma]

I have one. If no one does it before I get home, I'll take a pic for ya. My day just started....so you have to wait a couple of hours

[tehfunk]

k thanks.

[tehfunk]

auke? anybody?

[Auke Haarsma]

Here are some pics:







Hope this can be of any use to you!

[Dragonfly]

in case you prefer the "original version", here's a picture I took of my old micro amp a while back....

[tehfunk]

thanks, both of you. Auke, what IC is in your micro amp, and what about in the original, dragonfly? Thanks!

[sshrugg]

Wow! The guts in the original version are NASTY looking!  Makes my amateur bedroom builds look better : P

[Dragonfly]

thanks, both of you. Auke, what IC is in your micro amp, and what about in the original, dragonfly? Thanks!

TL061, IIRC...

[Auke Haarsma]

UA741CP in mine.

[tehfunk]

UA741CP in mine.

I don't know about the tl061, but am I right that the 741 is a single op amp? If so, that's interesting because in the pictures thread when i posted the breadboarded mxr micro amp i used a dual op amp and some people said they had always wondered why the schematics for the micro amp call for dual op amps because it's a waste. (I think that's what they said) Anyway, that came off in a very confused way, but yeah, I just wanted to make note of that.

[rogeryu_ph]

Auke and Dragonfly hi,
Just planning to replace my mosfet booster due to annoying HISS....
Does your microamp a quiet one? When microamp set into level you desire and your not playing and the AMPLIFIER is set into mid volume can you hear any noise? HISS or HUM?

Appreciate your help on this

Roger

[tehfunk]

I just built one, finished it tonight, did not hear any hissing or noise when using it... it's a nice little booster.

[Auke Haarsma]

it's a pretty clean, lifeless booster. Definately not my favourite. I just happened to have it
However, the mosfet boost should be pretty quiet. Are you sure the hiss is caused by the mosfetboost?

[arma61]

However, the mosfet boost should be pretty quiet. Are you sure the hiss is caused by the mosfetboost?

+1

I have the same problem with almost all my buildings hiss and/or hum, so, when they're ready to test, I bring them to my friend home, and when we use them there his garage, hiss and hum are not there anymore, but they're there again when I'm back to my home!, so it must be something in my home (earth connections) or it must be because I test them close to my PC (monitor, printer...), so I'd suggest to try with different setups in different places, don't give up 

Cheers

[rogeryu_ph]

Guys,
At our practice venue also the same
I even pull out the mosfet and power up the circuit and plug into the AMP with mid volume AMP is just the same level of HISS... I think it's not the mosfet... Before I never notice this but after band break and I left my amp still on then came back afterward and found out this hiss...When i get home i did re test with my 65w amp on mid volume set up and realize its the booster . I love this booster so much, it's different with SHO and mini booster that I breadboard before. I can cut through the mix with very sparkling solo.  I tested 3pcs bs170 and 2pcs 2n7000 of course different orientation but to no avail.
Tehfunk when you stop playing and your amp set to just mid volume and with microamp still turn on there is no hiss or hum? Maybe this would be now my replacement.

Thanks guy,
Roger   

[Barcode80]

try the buckaroo boost or the sekovia power booster, or the old standby lpb. the rocket boost in yun's gallery is DEAD quiet, it is basically a rebiased lpb.

[Dragonfly]

try the buckaroo boost or the sekovia power booster, or the old standby lpb. the rocket boost in yun's gallery is DEAD quiet, it is basically a rebiased lpb.

the sekova is also a LPB

[Barcode80]

heh, funny, never noticed that

[rogeryu_ph]

Any links guys
Thanks,
Roger