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VFE Switching Board - questions while building

Started by mark123, November 18, 2017, 05:55:21 PM

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mark123

I have a 1/2W 1k resistor near the Zener and the other 1k resistor in the schematic comes off the switch on the silkscreen it's marked P1k but I'm not familiar with the P.  What does it mean?

hasanova

I guess, P stands for "Power", it's a power/ current resistor?

somnif

Quote from: hasanova on November 18, 2017, 07:36:58 PM
I guess, P stands for "Power", it's a power/ current resistor?

Pretty much this. Its a 1/2W resistor in a 1/8W size form factor. Its acting as a power resistor (designed to stay cool while having lots of power running through it).

mark123

#3
Thanks for the info. Is this common?

madbean

Quote from: mark123 on November 19, 2017, 12:30:09 AM
Thanks for the info. Is this common?

Peter suggests 1/2W for when and 18v power supply is used but so far all the VFE pedals I've seen are 9v only. A 1/4W is fine for all the VFE projects I've released so far and is actually what is recommended in the new switching board doc. There's no downside to using 1/2W (the upside being better current handling and slightly less noise prone), though. It's just less commonly used in pedals.

mark123

Quote from: madbean on November 23, 2017, 01:33:28 PM
Quote from: mark123 on November 19, 2017, 12:30:09 AM
Thanks for the info. Is this common?

Peter suggests 1/2W for when and 18v power supply is used but so far all the VFE pedals I've seen are 9v only. A 1/4W is fine for all the VFE projects I've released so far and is actually what is recommended in the new switching board doc. There's no downside to using 1/2W (the upside being better current handling and slightly less noise prone), though. It's just less commonly used in pedals.
Thanks.

Is using the P in the P1K have any significance to anyone other than VFE?

madbean

Quote from: mark123 on November 23, 2017, 05:37:09 PM
Quote from: madbean on November 23, 2017, 01:33:28 PM
Quote from: mark123 on November 19, 2017, 12:30:09 AM
Thanks for the info. Is this common?

Peter suggests 1/2W for when and 18v power supply is used but so far all the VFE pedals I've seen are 9v only. A 1/4W is fine for all the VFE projects I've released so far and is actually what is recommended in the new switching board doc. There's no downside to using 1/2W (the upside being better current handling and slightly less noise prone), though. It's just less commonly used in pedals.
Thanks.

Is using the P in the P1K have any significance to anyone other than VFE?

Not AFAIK. I'm sure he used "P" to designate the 1/2W in that position as opposed to the other 1k resistor on the board which is 1/8W.

mark123