MICRO AMP KIT – ISSUES

[Anonymous]

Hello,

I started to build a MicroAmp kit, but the building instructions seems to not have been updated.

Indeed, the R10 (1N4001) doesn’t appeared on the schema. Anyone has an idea to where should I place it ?

And i’ve got 3 remaining components

There are the following :

C2 (100n)

C4 (*4u7)

C7 (1u)

R10 (I identified the part, but I don’t know where to place it, because it doesn’t appears on the board.

 

And the components I have :

-1k63

-1J63

-4,7uf

 

Any ideas where which one of these goes to the board, and where is R10 ?

Thank you

[Brent]

that does appear to not be updated, but I think I can help.

The 1N4001 is actually a rectifier so I assume that what that was supposed to be for.  In the new instructions you can see that D5 is a 1N5817 diode that serves that purpose on the Emexar board.

Basically you need to use to the BOM for the emexar at the beginning of the web document and then swap out or leave the the components as directed for the Micro AMP build. You will have empty spots on the EMEXAR board when your MicroAMp build is complete

The reason for this is the Circuit that the MicroAMp is based off of is pretty much the MXR Distortion+ without the clipping section.  In other words if you follow the bill of materials listed for the EMEXAR page, you should and will have some components left over as the part count is less for the Micro Amp.

I hope I made sense!  Good luck on your build

[Barry]

D5 is where you need to put the 1N4001. It is just a circuit protection diode and not critical to the build. Technically this should be 1N5817 however the 1N4001 will still complete the circuit. R10 is a typo that I will correct.

The Microamp was created by MXR from the Dist+ minus a few parts. Since the majority of people build a Dist+, or DOD250 that is the way the PCB is designed. To provide for those wishing to build a Microamp they can still do so using the same PCB. Brent covered this above.

Also

1k63 is a 1uF

.1j63 is a 100n

4u7 and 4.7uF are the same.

Finally since 4.7uF is an electrolytic capacitor it requires the correct orientation in C4 which is designed for a square film capacitor for Dist+ and DOD250 builds. Since you are copying the MicroAmp you must use a 4.7uF electrolytic instead.

All you need to do is make sure the (+) lead of the Electrolytic gets soldered to the TOP C4 pad (looking straight on). and the Negative lead goes to the bottom pad.

[Anonymous]

A huge thank for your time and advices ! ????

I’ll do that

[Author]

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