Resistor Value Up or Down
- Thread starter joelorigo
- Start date
spi
Well-known member
Make sure you mean MEGAOHM. And yes, a 4.99M or 5.1M would work fine here, and I doubt you'd notice a difference.
joelorigo
Well-known member
Oh yeah! I've never done that.
EDIT: Oh, Tayda had 5.1
www.taydaelectronics.com
EDIT: Oh, Tayda had 5.1
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joelorigo
Well-known member
Thanks. Oh while I have you, is this going to be a big pain for the 2 speed pots in the Electrovibe? Having trouble finding any with PCB pins
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ICTRock
Well-known member
Thanks. Oh while I have you, is this going to be a big pain for the 2 speed pots in the Electrovibe? Having trouble finding any with PCB pins
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joelorigo
Well-known member
Thanks!16mm Dual Gang Potentiometer - Short PCB Leg
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Chuck D. Bones
Circuit Wizard
4.7M is also plenty close.
Ah pity the foo who sticks two resistors in series!
Ah pity the foo who sticks two resistors in series!
fig
Village Idiot
Mr T.,
Is that because each resistor does not take total voltage but divide it, or what? Go easy on me B.A.
Chuck D. Bones
Circuit Wizard
I know you're asking "for a friend."
Hooking resistors in series to hit a specific value is silly because 99% of the time, you can get plenty close with what you already have. Failing that, go buy what you need, you can get 100 for $1US.
Hooking resistors in series to hit a specific value is silly because 99% of the time, you can get plenty close with what you already have. Failing that, go buy what you need, you can get 100 for $1US.
Chuck D. Bones
Circuit Wizard
Only if you're changing the resistance by a substantial amount, say more than 10%. On the other hand, if you maintain the resistance ratio, then you don't have to bother with analyzing the effect of unbalancing the voltage divider.
fig
Village Idiot
One last question sir, and you've been amazingly patient.
Do the same tolerances that apply to guitar pedal circuits also apply to......say........a big telescope in space?
I'm guessing 'no'
Chuck D. Bones
Circuit Wizard
Some places yes, some places no. We used every trick in the book to be able to measure & control the temperature of the 6K coldhead to within ±10mK. The power converters and class-D power amplifiers could get away with 10% tolerance resistors.
DAJE
Well-known member
I just tented two resistors to make an unusual value. I know it won't make a difference but I felt "why not?" since it was easily done. Wouldn't do it in something I was making for someone else, probably, but since it's for me, I don't mind.
EDIT: 348K resistor for a Pharmacist, if you're wondering. 330+18. I didn't bother with the 57.6K because the first 56K I measured read 57.2K anyway.
EDIT 2: I'm sure makers source (or order specially made) resistors in wacky values specifically to annoy cloners.
EDIT: 348K resistor for a Pharmacist, if you're wondering. 330+18. I didn't bother with the 57.6K because the first 56K I measured read 57.2K anyway.
EDIT 2: I'm sure makers source (or order specially made) resistors in wacky values specifically to annoy cloners.
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