Author Topic: VFE Switch Board doc update 8.7  (Read 422 times)

madbean

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VFE Switch Board doc update 8.7
« on: August 07, 2017, 07:17:58 AM »
I noticed that the 47uF low-ESR caps in the Mouser Project linked in the Switching Board doc are no longer in stock. So, I have added two alternates; a 10uF and 22uF. Both are low-profile and low-ESR. You can use either one but you don't need to order both values. The 47uF is still listed in the Mouser Project in case it does come back in stock anytime soon.
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Fuad

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Re: VFE Switch Board doc update 8.7
« Reply #1 on: August 09, 2017, 01:54:33 AM »
Can these be subbed with 47 uF tantalum caps?

madbean

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Re: VFE Switch Board doc update 8.7
« Reply #2 on: August 09, 2017, 05:10:27 AM »
Yes, you can use tantalum. There are low-ESR tants as well. Just be sure to put them in the right way.
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somnif

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Re: VFE Switch Board doc update 8.7
« Reply #3 on: August 12, 2017, 03:45:30 AM »
Do you need 1 or 2 caps? Looking at the schematic I can only see 1, and your pic of the choral reef build only shows one, but the switching board document says "(qty 2)" in reference to it.

Never mind, duh, I realize needing 2 would be for the split rail supply style. Sorry, pedaling at 3am.

somnif

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Re: VFE Switch Board doc update 8.7
« Reply #4 on: August 13, 2017, 01:21:47 AM »
Would this cap work in place of the Mouser component? https://www.arrow.com/en/products/nsrz470m25v6.3x5f/nic-components

Its datasheet lists its max impedance as 0.47 ohms, compared to the 1.3 ohms of the Nichicon cap. (Assuming I'm reading the datasheets right, anyway)

madbean

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Re: VFE Switch Board doc update 8.7
« Reply #5 on: August 13, 2017, 03:38:00 AM »
Yup that'll be fine.
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brucer

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Re: VFE Switch Board doc update 8.7
« Reply #6 on: August 14, 2017, 09:50:05 AM »
I noticed that the 47uF low-ESR caps in the Mouser Project linked in the Switching Board doc are no longer in stock. So, I have added two alternates; a 10uF and 22uF. Both are low-profile and low-ESR. You can use either one but you don't need to order both values. The 47uF is still listed in the Mouser Project in case it does come back in stock anytime soon.

Sorry if I'm missing an obvious point, but ... am I reading this correctly as: it's okay to sub either a 10uF low-ESR cap OR a 22uF low-ESR cap for the BOM's 47uF cap?  Seems like a big value change, so thought best to check.

madbean

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Re: VFE Switch Board doc update 8.7
« Reply #7 on: August 14, 2017, 09:55:36 AM »
They will all work about the same. In the charge pump design one electro supplies the pump with a constant voltage and the other decouples the output from ground to supply the circuit. The difference is using 10uF, 22uF or 47uF should not have much impact on the voltage output (I typically use 10uF and the Klon even uses 1uF). Using the suggested low-ESR type probably has more influence on the output that the particular value chosen for the two caps.
I own madbeanpedals (duh). I am part owner of Function F(X).

hasanova

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Re: VFE Switch Board doc update 8.7
« Reply #8 on: August 28, 2017, 04:08:02 AM »
Is it okay to use a 100uF (35v) electro in stead of the 150uF (25v), because the 150uF electro's I have from Tayda are 10x12mm with 5mm lead spacing; too big.
The 100uF electro's I have in stock are 6x11mm with 2.5mm lead spacing. These will fit under the board.

madbean

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Re: VFE Switch Board doc update 8.7
« Reply #9 on: August 28, 2017, 05:56:19 AM »
Yeah a 100uF is fine.
I own madbeanpedals (duh). I am part owner of Function F(X).