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help with a capacitor value |
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zigzagwanderer 
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Joined: 01 February 2021 Location: sw uk Status: Offline Points: 68 |
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 Topic: help with a capacitor valuePosted: 02 November 2025 at 8:14pm |
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I need to replace this capacitor in a Furman power conditioner , its dead so i cant measure the value
but am struggling to understand the markings. is it F = 27 so 27nf or F .27 so maybe 270nf or something else ? can anyone with more experience with these things offer any insight Edited by zigzagwanderer - 02 November 2025 at 8:20pm |
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James Tengo
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Joined: 09 May 2008 Location: Nomadic Status: Offline Points: 2189 |
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Posted: 03 November 2025 at 12:57am |
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Is this on the light driver or the voltage display board? Most of the Furmans I’ve been inside only really have MOV’s across the supply, a very expensive box of not much
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Earplug
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Posted: 03 November 2025 at 6:55am |
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Post a picture? |
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Earplugs Are For Wimps!
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zigzagwanderer
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Posted: 03 November 2025 at 9:08am |
Neither , those are on seperate pcb's , this has a main board with a relay , the capacitor and relay are right at the front of the circuit on this board and i'm not getting any power past the relay.
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zigzagwanderer
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Posted: 03 November 2025 at 9:09am |
Edited by zigzagwanderer - 03 November 2025 at 9:10am |
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Earplug
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Posted: 03 November 2025 at 10:58am |
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That's 27nF, 400V. Maybe used for "direct" AC-DC connection to power the relay? Often seen on LED bulbs, etc... |
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Earplugs Are For Wimps!
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zigzagwanderer
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Posted: 03 November 2025 at 7:20pm |
Thank you Yes "Capacitor --> bridge rectifier --> low power DC circuit" is basically what i am seeing.
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Earplug
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Posted: 04 November 2025 at 7:28am |
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Ok, cool. One thing -- there should also be a (high value) resistor in parallel with the capacitor. Make sure that that is also ok. |
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Earplugs Are For Wimps!
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zigzagwanderer
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Posted: 04 November 2025 at 7:13pm |
thank you , i've given it a thorough check over and a new cap from RS and were up and running again
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James Tengo wrote: