Page 1 of 2
#1
Well, seeing as it is the summer holidays now i have decided to make my own pedal. This is the first time i have attempted anything electronic, but i have been practising with a soldering iron for the last few days and i can get joints fairly neat and tidy.

I may need some help because this is my first ever pedal build, so any help would be greatly appreciated.

This is what i plan to build, i chose it because the diagram is really easy to follow lol


http://smallbox.zeonhost.com/projects/fface/
Please respect the site owner in his request that his diagram not be posted elsewhere.

The next two pics are of my work bench and all the parts, minus perfboard and one pot, they should be arriving tomorrow by post and i will then commence building it.

http://i15.photobucket.com/albums/a370/JFJH/DSCN3359.jpg


http://i15.photobucket.com/albums/a370/JFJH/DSCN3361.jpg
#2
ummmm, dont burn yourself on the sodering iron?
OMG you admitted to liking korn and soad, you better delete that before some of the metal heads come in riding there new ego fueled cars to bitch you out .

#7 Member of "The Mars Volta Fan Club"
#4
"Artwork Copyrighted. May not be posted elsewhere."

You just broke the copyright <_<
Bring back Tabo
#6
Quote by call1800ksmyazz
What transistors did you use for Q1 and Q2?


I used NKT275's i believe they are germanium, i heard germanium ones give better sound.
#9
Quote by seljer
what kind of bigass switch is that?


from the looks of it, a dpdt
#13
I mean brand. Alpha, Carling, etc... all the ones I've seen seem to be a good bit smaller than that one


To be honest i dont know, i got it from maplin though and it was £5, did i pay too much ? and yes it was alot bigger than i expected it to be lol
#14
Quote by JFJH
To be honest i dont know, i got it from maplin though and it was £5, did i pay too much ? and yes it was alot bigger than i expected it to be lol


well it looks tough as hell so I guess it was worth those £5
#16
it looks like any other footswitch i ever used, but that's maybe because they don't sell crap in my electronics store :p
#17
me and that pedal had some problems. Worked on it for days till i had the build exactly how it was shown and it still had alot of feedback and hiss, made my humbuckers sound like single coils.
#18
How do i know what side of each capacitor is positive or negative ?

Does it matter ?
#19
caps, yeah
big ones usually have writin on the cylinder, a line of - 's, showing that side is negative
#20
Ahhh it makes sense now thanks alot

Oone other question, with the transistors, on the diagram the legs are mrked C, B and E, how do i know which leg is C,B or E ? or does it not matter which one i use ?
#22
Oone other question, with the transistors, on the diagram the legs are mrked C, B and E, how do i know which leg is C,B or E ? or does it not matter which one i use ?
#23
it does matter, the diagram SHOULD show which way the tranny is facing.

got a different part layout for it?

you may need to search the web for a transistor information sheet showing which leg is which.
i think flat side facing left, it goes cbe from the top..but its a while since i used one.

what transistor is it? 2n3904?
#24
it's a NKT275, and no, thats the only diagram i have of the circuit

So what should i search for in google to find out which leg is which ?
#27
Quote by JFJH
How do i find out if i dont have a multimeter ?


google (if you find a picture of somebody else's fuzzface where they used one of them and look at the components around it)...or just guessing like I mentioned above


and buy a multimeter, you can get a basic one for $10 and it does all your basic measurments. Very useful if you're not sure about something (checking voltages to see if a circuit is malfunctioning in some place, testing conductivity for broken/bridged traces, measuring resistors you're not sure about, some have the ability to measure the gain of transistors, measuring the current consumption of an effect pedal)
Last edited by seljer at Jul 7, 2006,
#28
so the current should go in through the collector and out throuhg the emmitor, the one left over will be the base ?
#29
Well its a PNP, you can run a current through the emitter to the base or from the base to the collecter if you're testing it (both of these 2 are just acting as a diode)
If theres a large enough voltage applied to the base you can run a current from the emittor to the collector (and thereby you can use a small signal to generate a large signal)
Last edited by seljer at Jul 7, 2006,
#30
im still a bit confused about this. How exactly do i find out which is the base, collector and emmitor, sorry if im being stupid but this really confuses me
#32
Whats a socket ? sorry im a total noob at electronics. All i have is a battery, some wire, a light, and the transistor.
#33
ah
well a socket is like a little block which lets you chance tranny's without soldering

try it one way around, if it doesnt work, try it anohter, if you blow the tranny, its only about
a few quid....where are the germ's from btw?
#34
cricklewood electronics, its a website, just google cricklewood if you want to find the site.

So is there a process of elimination i have to go through to find out which is which ?
#35
Quote by JFJH
cricklewood electronics, its a website, just google cricklewood if you want to find the site.

So is there a process of elimination i have to go through to find out which is which ?


unless you have some solderless breadboard or a multimeter: nope :/


as for sockets: they're things you can plug ICs and transitors into so you don't have to solder them directly on to the board (because the heat can kill them if you're a bit slow at soldering, also allows you to change them around if you want to)

DIP socket: http://www.audioworkshop.com.hk/order/14DIP_socket.jpg (you can get various numbers of pins)
or an actual transitor socket: http://www.circuitspecialists.com/products/full/1988.jpg
or how to make a basic one by cutting up a DIP socket: http://www.diystompboxes.com/beginner/build/build%20004.jpg

I personally just stocked up on a bunch of SIL sockets http://www.pw-electronics.co.uk/Connectors_files/Turn%20Pin%2020%20Way%2010%20off.jpg that you can cut up for transistors or any other thing you want to socket so you can change later (capacitors, resistors, etc....
#36
yeah if you cant find a chart/info on it

tell you what, how long are the leads?


solder at the VERY tip of the leads, that wa, you can just cut it iff and try again if its wrong, less chance of frying it
#37
The problem with doing that is that I'm using 2 of them in the circuit and that would be 9 different combinations that the transistor might be in lol so i dont think trial and error would work.
#39
Oh right, i thought there were 3 possible combinations for each transistor, meaning that there were 9 combinations in total, because i wont know if one is working without the other working
Page 1 of 2