madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: harryklippton on February 27, 2021, 05:06:14 PM

Title: Ping C6 value
Post by: harryklippton on February 27, 2021, 05:06:14 PM
Whoops, I don't have a 39n cap. Would a 33nf or 47nf be ok? One over the other?
Title: Re: Ping C6 value
Post by: harryklippton on February 27, 2021, 09:41:45 PM
Well I went with the 33nf cap after seeing some old threads where some folks subbed a 33n for a 39n in the aquababy.
Title: Re: Ping C6 value
Post by: Bio77 on February 28, 2021, 03:06:09 AM
Did it work out?  It usually depends on what the cap is doing in the circuit.  If its part of a filter, it will work, but might sound different.
Title: Re: Ping C6 value
Post by: harryklippton on February 28, 2021, 03:12:15 AM
I didn't finish wiring it up yet. Hoping it works cuz it might be hard to get the brick out to swap it out.
Title: Re: Ping C6 value
Post by: Bio77 on February 28, 2021, 05:10:04 AM
Can you post a link to the schematic?  Do you measure the capacitance of you caps?
Title: Re: Ping C6 value
Post by: harryklippton on February 28, 2021, 05:26:16 AM
I did not measure the capacitance of the cap. Here's the schematic
(https://lh3.googleusercontent.com/pw/ACtC-3fKcK_EjXhrpQGdX60Oc7VuBkzIfyNcgL5HLkG8NRZvBsCQVMNYRMalEMuRX7b1N8P8jDk8VN_Orz0YRLD0cq1__4lMxyXhu-d3pDJm5xv4i-Ef7znT11lmDAlP-YXpH0KSAO3EAE7m_vqUKHuwt0Zr=w1114-h626-no?authuser=0)
Title: Re: Ping C6 value
Post by: Bio77 on February 28, 2021, 06:58:33 AM
I think you're going to be fine, but I'm still a dummy ;D, maybe somebody smarter can chime in.  Your cap is not in the audio path.  If you aren't measuring caps, they are +- 10-20% so 33 is 18% of 39, OK.  I do measure caps, and I like things in the audio path to be +- 5%, everything else I like +-10%, except power stuff where +-20% is fine. 
Title: Re: Ping C6 value
Post by: harryklippton on February 28, 2021, 12:43:28 PM
Thanks. I like that idea of using tighter tolerances in the audio path. Do you keep notes or write that stuff down when you're building?
Title: Re: Ping C6 value
Post by: davent on February 28, 2021, 08:14:24 PM
If there's room you could always parallel a cap in the 5n-7n range with the 33n, if you have something on hand.
dave