black cat od-1 almost complete, jus few simple questions

[dimebagslash123]

hi, been looking everywhere for tips on this but cant seem to find anything but the origional schematic which doesn't reallt help, iv soldered all the components and made the pcb etc, im just wiring the switch etc in now, iv soldered the pots for volume and gain, two things im not sure on are how to wire the footswitch i have bought and also when i bought the jacks (guy at maplins got all the parts ready for me) and theyre both mono (should one be stereo?) and also how do i know the live and earth? theres like 2 lugs on one side conected to two on the other side, one has a small raised Dot in it. any help would be massivley apprechiated, iv tried elsewhere but can't find anyone whos built one and has the instructions and this is my first pedal build,
thanks in advance!
Jay

[Paul Marossy]

hi, been looking everywhere for tips on this but cant seem to find anything but the origional schematic which doesn't reallt help, iv soldered all the components and made the pcb etc, im just wiring the switch etc in now, iv soldered the pots for volume and gain, two things im not sure on are how to wire the footswitch i have bought and also when i bought the jacks (guy at maplins got all the parts ready for me) and theyre both mono (should one be stereo?) and also how do i know the live and earth? theres like 2 lugs on one side conected to two on the other side, one has a small raised Dot in it. any help would be massivley apprechiated, iv tried elsewhere but can't find anyone whos built one and has the instructions and this is my first pedal build,
thanks in advance!
Jay

The Black Cat OD-1 was also my very first build. I had some of the same questions as you when I started. There is a lot of good info in the FAQ section here. I learned a lot just by reading that before I ever built anything.

For the bypass switching, see this PDF here that I made: http://www.diyguitarist.com/PDF_Files/GCI-TrueBypass.pdf - any one of the wiring schemes shown would work for your circuit.

I hope that helps...

[dimebagslash123]

sweet man, thanks! let you know how i get on

[Paul Marossy]

Cool.

[oldrocker]

Which dual op amp did you use?

[Paul Marossy]

In my own build, I tried a lot of different opamps. I couldn't really hear much of a difference between any of them. I liked it with a KA358, an NTE chip and the OP275. I like it best with the OP275.

[dimebagslash123]

the guy at maplins gave me a tl072cn, did he bend me over? he said it was the same....:!

[Paul Marossy]

the guy at maplins gave me a tl072cn, did he bend me over? he said it was the same....:!

They are more or less the same thing - they are both JFET opamps. The OP275 just has a "Butler frontend" on it.
http://www.analog.com/static/imported-files/data_sheets/OP275.pdf
http://focus.ti.com/lit/ds/symlink/tl071a.pdf

[dimebagslash123]

any idea how i can get op 275 in uk? doesn't seem to be in most places haha, going to switch to the boards i have precut instead of pcb but theres something needs correcting in the diagram and jus trying to get my head round it, i think its link 'http://www.diystompboxes.com/smfforum/index.php?topic=46756.0'; but some guys saying to swap something with voluimes and dont quite follow lol     ...  'useless me'

[Paul Marossy]

any idea how i can get op 275 in uk? doesn't seem to be in most places haha, going to switch to the boards i have precut instead of pcb but theres something needs correcting in the diagram and jus trying to get my head round it, i think its link 'http://www.diystompboxes.com/smfforum/index.php?topic=46756.0'; but some guys saying to swap something with voluimes and dont quite follow lol     ...  'useless me'

I don't know who sells them. I actually got some free samples from Analog Devices, that's how I got mine. I don't know if they still do that, but you can check out their website - http://www.analog.com/en/index.html

On the volume controls in the other post, it's saying to switch the connections at lugs 1 & 3. If you don't, your volume control will work backwards.

[Naz Nomad]

any idea how i can get op 275 in uk?

RS