madbeanpedals::forum

Projects => General Questions => Topic started by: tyskstil on October 04, 2019, 08:01:37 PM

Title: The many 1u film caps in Harbinger 1.5 project... is 10% tolerance good enough?
Post by: tyskstil on October 04, 2019, 08:01:37 PM
So I'm building the harbinger 1.5, and there are 13 film caps with unspecified tolerance. Most of my film caps are 5%, and so I was wondering if perhaps that was the assumed tolerance of the 1u caps. Anyways, I bought what turned out to be 10% caps, and I'm unsure if the tolerance is critical.


Title: Re: The many 1u film caps in Harbinger 1.5 project... is 10% tolerance good enough?
Post by: madbean on October 04, 2019, 08:09:23 PM
5 to 10% tolerance is fine for most any circuit. I have a mix of both and never give it a second thought.
Title: Re: The many 1u film caps in Harbinger 1.5 project... is 10% tolerance good enough?
Post by: tyskstil on October 04, 2019, 08:31:20 PM
Thanks for the fast answer! I've been refreshing your page for the last 6 months or so to buy the Harbinger, and it finally arrived today, so its very good new that I dont have to wait for another delivery of caps!
Title: Re: The many 1u film caps in Harbinger 1.5 project... is 10% tolerance good enough?
Post by: tyskstil on October 04, 2019, 09:27:10 PM
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Title: Re: The many 1u film caps in Harbinger 1.5 project... is 10% tolerance good enough?
Post by: tyskstil on October 04, 2019, 10:03:44 PM
Quote from: madbean on October 04, 2019, 08:09:23 PM
5 to 10% tolerance is fine for most any circuit. I have a mix of both and never give it a second thought.
Anothher question: The build doc gives some instructions on which components to leave in / out when using either a 9V or 19V power supply. Can I just sodder everything in, but only put power in one of the two channels, say the 18V, so that it's easier for me if I change my mind and want to switch to 9V at a later stage?

Also: C33 is missing in the BOM, though its in the schematic.
Title: Re: The many 1u film caps in Harbinger 1.5 project... is 10% tolerance good enough?
Post by: madbean on October 04, 2019, 10:06:43 PM
You cannot hot swap the PSU with this design. You could solder in everything but D3 for first testing 18v PSU then later on install D3 and try a 9v.
There should not be any appreciable difference between either power scheme.


Thanks, someone had already mentioned C33. I will get that corrected.