newbie electronics question (about chassis mainly)

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hey_mavis

New member
Joined
May 18, 2010
Messages
1
ok a few dumb questions:


let's say I buy a kit with a PCB and I assemble it what does the PCB sit on in the chassis? is it just free wheeling in there? is it glued to the 'floor' of the chassis? If so is it glued at a certain prescribed height?

Also if I buy a kit with components, a PCB and knobs, how do I know the correct vertical orientation on the front panel to cut the holes to put the knobs? How can I be sure that the holes I cut (or get other ppl to cut) will be in the right place for the knobs or TRS/XLR ins and outs?

I can just see myself ordering a chassis with holes in it and not having the PCB line up with the holes right and therefore screw up my whole life, and possibly wreck the universe in the process.


If I see a schematic, say for an 1176, can I build it on a perforated circuit board with just wire and solder (and components) or do I need a PCB?


Transformers; when building a simple summing mixer (just resistors and ins/outs) can I just slap on some transformers on the outputs or are they active components requiring a power supply?

in this link

http://www.jensen-transformers.com/as/as066.pdf

the upside down pitchfork thing in the schematic is a ground? is that correct?

I prolly have a few more dumb questions up my...shall we say....sleeve? i will post more as they come to me...
 
PCB's use 'standoffs' and the pcb's groundplane is usually insulated from the chassis via these. You generally want one exit point for your grounds on your pcb, so as to avoid hum or other issues. This will come from a wire, not from a standoff.
http://www.google.com/images?q=pcb+standoffs&rls=com.microsoft:en-us&oe=UTF-8&um=1&ie=UTF-8&source=univ&ei=nHX1S7erJoKB8gaEhuS9Cg&sa=X&oi=image_result_group&ct=title&resnum=6&ved=0CEcQsAQwBQ

The good news with the pots is, if you think on it for a bit, you will see that if the knob and shaft is concentric it does not matter how it pot is oriented so long as you can compensate for the graphic start and end points by getting the knob situated then screwing it down. Most pots turn about 300 degrees.
Concentric switches are a different story.

I think I misread your question, I was tired. If the pcb pot placment does not line up with the faceplate, you can always run wire from the legs of the pot to the pcb holes.
 
By the way, so that you may avoid future ridicule, do some searching on the nets and in this forum before posting your questions. Most answers can be found this way.

Start here: http://www.groupdiy.com/index.php?topic=16013.0
 

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