madbeanpedals::forum

General => Open Discussion => Topic started by: PhiloB on January 26, 2014, 07:43:51 PM

Title: Quasar Question (C1)
Post by: PhiloB on January 26, 2014, 07:43:51 PM
I messed up ordering.  I didn't order C1 - 47nF.  Can I substitute another value or is this a critical value.  I've socketed the PCB at that point so that I can hopefully test the circuit and replace the cap with the appropriate value when I get it. 
So, can I jump it with a wire just to test? I have an extra 100nF I could use.
Thanks for any help!
P
I'm including the Quasar PDF
Title: Re: Quasar Question (C1)
Post by: Leevibe on January 26, 2014, 08:13:49 PM
I dont know that circuit but i think 2 100nF in series should be close enough (50nF) for test purposes. 
Title: Re: Quasar Question (C1)
Post by: PhiloB on January 26, 2014, 09:14:51 PM
Thanks LeeVibe.  I'll give it a shot tomorrow.
Title: Re: Quasar Question (C1)
Post by: RobA on January 26, 2014, 09:37:59 PM
Moving C1 to 100nF is most likely going to be fine for this. It'll just let a bit more bass through. Depending on the input impedance, you may not even notice any difference.
Title: Re: Quasar Question (C1)
Post by: jkokura on January 26, 2014, 09:53:45 PM
22nf-100nf will work fine. Whatever you have in that range should work. You may find more bass content is necessary if you use a low value and may want to switch in a higher value, but if you find too much bass with a high value you should lower it.

Jacob
Title: Re: Quasar Question (C1)
Post by: PhiloB on January 26, 2014, 10:26:40 PM
Thanks guys
Title: Re: Quasar Question (C1)
Post by: PhiloB on January 27, 2014, 01:22:54 PM
Had to run an errand earlier today and drove by RadioShack. So I figured, I'd step in and see what they had. Picked up 47 nF capacitor for two bucks! A rip off but beats paying shipping handling. Rocked it before I boxed it and the circuit works perfectly :-)
Title: Re: Quasar Question (C1)
Post by: RobA on January 27, 2014, 03:02:20 PM
An RS by you still has parts in it? The last one I went into only had cell phones. It's cool you were able to get the right part though.
Title: Re: Quasar Question (C1)
Post by: Leevibe on January 27, 2014, 04:38:18 PM
Glad it's working!!  It's hard to avoid the occasional RS shopping trip.  Ours has plenty of stuff, it's just usually everything but what I need.