A few questions.....I really need help...

Started by harkkam, May 28, 2008, 06:19:11 AM

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harkkam

I just finished building a PNP fuzz face and I scrapped it because I couldt figure out what the problem was.

I have a few questions I need clarified.

1. Where can I find out which way the schematic wants me to put the base, emitter, collecter? (Like How do I know the sign with the arrow means what....)
2. How do I connect the different parts together....I just created a stream of solder from one part to the next just creating little beads and then melting them together.
3. To ground the object i can just connect all the wires together to one part of the whole board? Meaning I take all the ground wires and twist them together and solder them into a hole in the perf board?
4. What does the dark arrow pointing inward on the PNP fuzz face schematics on the 1k Pot that says 20 uf. Does that mean I just take the negative side and connect it to the middle tab on the pot?

frequencycentral

#1
1. http://www.kpsec.freeuk.com/components/tran.htm - also type into google the transistors you are using and find the pinout from the spec sheet.
2. You can use resistor leads/legs - I save cut off bits for this purpose too.
3. Select one strip of perf to be your earth, maybe the outer edge, and take everything that needs earthing to that strip.
4. Thats the wiper (centre tab, #2) of the pot, which goes to earth via the 20u cap, the one above (#3) goes to the emitter of Q2, the one below (#1) to earth.

And make sure the 20u cap is correctly oriented: http://www.kpsec.freeuk.com/components/capac.htm

And you're definately using PNP transistors right?

Edit: Note that the PNP Fuzzface is positive earth - make sure your battery is connected the right (wrong?) way - the +ve (red) lead of the battery is 'earth', the -ve (black) goes to the conjunction of the 33k and 470 Ohm resistors (if you are working from the first schematic on the link below).

http://fuzzcentral.ssguitar.com/fuzzface.php
http://www.frequencycentral.co.uk/

Questo è il fiore del partigiano morto per la libertà!

harkkam

Yes that is the schematic Im using....

Saving the leads seem to be a good idea...

When you mean a section of perfboard...do you mean i just solder like a small line and then connect everything to that line of solder?

Yes im using PNP transistors..im using 2n3906 for both Q1 and Q2. There silicon PNP.

Yes the positive terminal from the battery was connected to the ring of the input jack.

When I see the intersection of two black lines that means that I solder them together so they make contact right?

idlechatterbox

Quote from: harkkam on May 28, 2008, 12:53:33 PM

When you mean a section of perfboard...do you mean i just solder like a small line and then connect everything to that line of solder?

You could do that, though getting solder to obey straight lines isn't always easy. There are a number of ways to do what you are trying, but one of the easiest is to take some bare wire (I use skinny copper wire, but anything will work, as long as it fits through the small holes) and run that through a line of holes, as if you were sewing and the wire was your thread (and the perf board was your fabric). Then just "tie" the end of the wire at the far ends of the line. I just make a loop and twist it. At that point, you can link all your grounds (or "earths" if that's your lingua) to that "thread," including the two ground wires coming off the jacks, etc.

Not a bad idea to put something over that thread once you're done, just so something doesn't accidentally make contact with it. I never take the fancy approach to that; cellophane tape works fine as "insulation" for the type of voltages involved.

Others no doubt have their preferred methods. Good luck to you  :icon_smile:

frequencycentral

#4
"When you mean a section of perfboard...do you mean i just solder like a small line and then connect everything to that line of solder?"

Yes - or use cutoff resistor legs or wire to make your line.

"Yes im using PNP transistors..im using 2n3906 for both Q1 and Q2. There silicon PNP."

Always a good idea to use sockets for the transistors - just in case you put them in wrong or use too much heat.
Here's the pinout: http://www.fairchildsemi.com/ds/2N/2N3906.pdf

"When I see the intersection of two black lines that means that I solder them together so they make contact right?"

Yes

Check the 2.2uf and 22uf caps are correctly oriented.

Check for solder bridging tracks they shouldn't be.

Check everything against the schematic 20 times!

Read this: http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

If it still doesn't work post some voltages - someone more knowledgable than me will help decipher whats going on!
http://www.frequencycentral.co.uk/

Questo è il fiore del partigiano morto per la libertà!

frequencycentral

http://www.frequencycentral.co.uk/

Questo è il fiore del partigiano morto per la libertà!