OD- 1 Cap and Q ??'s

[rosssurf]

 :-\I am working on the OD-1 layout seen here.

http://aronnelson.com/gallery/Martys-layouts-and-photos/OD_1update  

I do not have a .018uf cap for C4. the closest I have is a couple of .047uf's. Can I use these without damaging the effect . What might the difference be in sound.
Also, how do i orient Q1 and Q2 this layout does not have any markings.

[pyrop]

Hi rosssurf,
Using the .047uf cap in C4 should be ok. I would socket it so you can change it later. Not 100% sure what the difference will be as it is in the feedback loop of the op-amp.I'm pretty sure it will slightly affect the gain.

As for the transistor layout
Q1 & Q2 from top to bottom

C
B
E

paul

[George Giblet]

You need to get that cap value correct otherwise it will change the sound of the unit.
- 2x47n in series will give you 23.5nF, that 30% larger than the 18n, the sound will be a less bright
- 3x47n in series will give you 15.7nF, that 15% smaller than the 18n, the sound will be a little brighter.

I'd go with the three in series.  You should put in an 18nF at some stage.

[wampcat1]

:-\I am working on the OD-1 layout seen here.

http://aronnelson.com/gallery/Martys-layouts-and-photos/OD_1update   

I do not have a .018uf cap for C4. the closest I have is a couple of .047uf's. Can I use these without damaging the effect . What might the difference be in sound.
Also, how do i orient Q1 and Q2 this layout does not have any markings.

If you connect two .047uf caps in series you will get about .023uf of capacitance. In your particular situation, the larger the cap, the more you are going to change the eq of the pedal, specifically rolling off more and more highs. Honestly, I'd use somewhere between a .015uf and a .022uf if possible.

Hope that helps!
Brian

[wampcat1]

You need to get that cap value correct otherwise it will change the sound of the unit.
- 2x47n in series will give you 23.5nF, that 30% larger than the 18n, the sound will be a less bright
- 3x47n in series will give you 15.7nF, that 15% smaller than the 18n, the sound will be a little brighter.

I'd go with the three in series.  You should put in an 18nF at some stage.

DOH! you beat me to it! 

[rosssurf]

You guys are great! Thanks for your help and quick responses. I am dyin' to hear this thing ( if it works) so for now I will series two .047's and tommorow I will get the right caps.

Ross Tyrie
Crushingday.com

[rosssurf]

Where does my battery ground go !

[wampcat1]

Where does my battery ground go !

to ground (connect all the grounds together)

[rosssurf]

Thanks wampcat!

[MartyMart]

The 0.018uf ( 18n ) cap is an "odd" one !
I think that I used a 15n/0.015uf as it was close enough.
Much higher and you will change the sound a wee bit too much, though
if you have a 22n that may well do it.
Battery - terminal should connect to the stereo input jack socket's "ring" connection
to use it as a "power on" when jack plug is inserted.

Thanks for trying the layout BTW

Marty.

[rosssurf]

Thanks marty