Author Topic: coupling resistor on power conditioner output  (Read 990 times)

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Offline gkmaiaTopic starter

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coupling resistor on power conditioner output
« on: August 23, 2020, 09:57:47 am »
I got a Furman power conditioner that has a faulty resistor. R7 on the left of the schematics on the output block has burned to death... so cannot read it.

Could anyone give me a hand to understand what a resistor on that circuit design does and it's likely value?
« Last Edit: August 23, 2020, 09:11:04 pm by gkmaia »
 

Offline oschonrock

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Re: coupling resistor on power conditioner output
« Reply #1 on: August 23, 2020, 02:40:53 pm »
What is being connected at Tab10/Tab6? Is that the output of the conditioner?

Where did you get this schematic from? Are you sure all of D9/D10/D11/D12 are the correct way around?
 

Offline gkmaiaTopic starter

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Re: coupling resistor on power conditioner output
« Reply #2 on: August 23, 2020, 09:10:43 pm »
You were right. D12 was inverted. Fixed it and uploaded a new one to my previous post.
 

Offline NiHaoMike

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Re: coupling resistor on power conditioner output
« Reply #3 on: August 23, 2020, 11:01:34 pm »
Appears to be just a bleeder for the overshoot dampening circuit. A 330k, 1W resistor will work well with fairly low power dissipation, just beware it will take some time to discharge the cap. Add a blue LED in series as a visual indication of voltage.
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Offline gkmaiaTopic starter

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Re: coupling resistor on power conditioner output
« Reply #4 on: August 23, 2020, 11:19:39 pm »
thanks for the reply. So this basically allows to extra overshot voltage to be feed to C7 maintaining the voltage somewhat more stable?

So this means, it will still work with no resistor there. It will just not smooth the AC as well as it could?
 

Offline NiHaoMike

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Re: coupling resistor on power conditioner output
« Reply #5 on: August 24, 2020, 12:21:21 am »
So this means, it will still work with no resistor there. It will just not smooth the AC as well as it could?
Correct, also the capacitor will stay charged for a very long time so beware the next time you work on it.
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Offline gkmaiaTopic starter

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Re: coupling resistor on power conditioner output
« Reply #6 on: August 24, 2020, 12:45:26 am »
thanks, that makes sense.

I could get hold on two other working board and pulled the resistor out.

It seems 3 watts

On my all my 3 HP multimeters both working ones read more than 20Mohm (beyond the range) while the code I wouold say either 15k or 10k... not sure. 

I am confuse....
 

Offline perieanuo

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Re: coupling resistor on power conditioner output
« Reply #7 on: August 24, 2020, 09:35:16 am »
10k
but for 220w is too low wattage those 3w
you have 120vac in nz?
in 120VAC case, 10k may be the one, you have less than 2w dissipated power
sorry, I don't know by heart voltages in your country, but for 10k I guess it's 120volts :)
« Last Edit: August 24, 2020, 09:38:21 am by perieanuo »
 

Offline gkmaiaTopic starter

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Re: coupling resistor on power conditioner output
« Reply #8 on: August 24, 2020, 09:44:14 am »
We have 240v here in NZ.
 


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