Can someone please Help me?

[coreybox]

Sorry to ask, but given this schematic



Could you please look at a picture of my breadboard (download here...sorry for the wait, its big http://*****/boost%20help/DSC00370.JPG) and tell me what is wrong with it?  Is there some connection i have wrong?  The guitar signal is not coming through at all, but i get loud hum (which may just be because the 'test' jacks im using are not grounded).

thanks for your time
corey

[Seljer]

ground those jacks!!!

and double check the pinout of the mosfet

[zpyder]

Having both of your jacks connected to ground (and therefore eachother) completes the circuit.  You won't get anything out of it unless both are grounded, and I definately don't see grounding wires for the jacks.  Attach leads to both of the jacks, put them into a row right next to your ground row (with the 3 green leads, 1 yellow, and 1 resistor lead) and them jumper the 2 together.  That should at least complete the signal circuit.

What is it?  And also, what is the silver thing in the middle??

[coreybox]

The silver thing was a led, just to make sure that the power was running correctly.  Yeah, i grounded the jacks, still nothing.....but it was the pinout. Here is the data sheet, that i just looked up after reading the first reply here (thanks). Seems i thought the drain was the opposite of what it was.

thanks guys
corey

http://www.zetex.com/3.0/pdf/BS170P.pdf

[burnt fingers]

That's a great little booster I'm glad you got it working.  I've built a couple of those myself.

Where did you find that schem at? the one I have is very old school done with dot's and dashes in a text doc

Scott

[gaussmarkov]

That's a great little booster I'm glad you got it working.  I've built a couple of those myself.

Where did you find that schem at? the one I have is very old school done with dot's and dashes in a text doc

Scott

hmm ... it might be improved with some "noiseless biasing."  see R.G.'s article Mod your Mu-amp/Minibooster.  R.G. suggested it to Joe Kramer recently for a project of his and it was a big improvement. 

it's a nice trick to know about.   it shows up in Jack Orman's AMZ mosfet booster.

--gm