TomGeorge:
Hi,
Just looking at spec for LM386, they have in some cases a 10uF bypass cap from pin 7 to ground.Is it possible that in going SMD your track width is causing volt drop to chip supply pins?
Tom......
thanks for the replies.. (I'll try to go through them more once I get to work/break)..
As for the SMD track thoughts...
wouldnt that also be a problem with the PCB that is in the breadboard then?
The same exact pcb.. just has some pins soldered to it.. and place in a breadboard.. so I can easily have space to mock-up other components/parts with it for testing.. before using the same board (without header pins).. and solder directly to it.
I doubt my DMM has a capacitance option.. (what does it look like....[the symbol]?)
I'm still not clear about the breadboard capacitance stuff... I suppose I could just pull the pcb out of the breadboard... leaving just the pot connected to it.. (or heck even just connecting wires straight to the pot, so nothing is in the breadboard anymore).. and see if it still sounds good..
at that point though... I'm not sure what could be the problem.. if I am in using the exact same SMD values of the through holes I am testing with?
I appreciate all the suggested values to changes other components too, but I'm not grasping why the current values work and sound good on one board, and not the other then? If these were the issues.
(all valid things to explore no doubt, and see how things improve or change..etc... but I'd like to not change things until I can get the two current boards aligned using the same/current values., if that makes sense)
Also as WAWA mentions.. the images should be big enough, not sure what the forum software does to the images.. if I click on them, they open up to bigger images
I am powering the board from a +7.4v Li-Ion pack.
I really am ok with how it sounds IN THE BREADBOARD.. (which is mis-leading, because its really an assembled pcb.. and only in the breadboard for easy prototyping with it)
just cant the standalone version to match the quality.
@WAWA what value to do suggest for C18 then?
SMD to make the footprint as small as it could be to be used in the most variety of projects (which is mostly , small sci-fi props...etc)
I cut some solder masks on my vinyl cutter, smear some solder paste, populate, pop it into my $17 wal-mart toaster oven and the are done.
thanks guys! hoping to still get this worked out.. and understand more.