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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Capacitors
Hi All
I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA -- Dave The Medway Handyman www.medwayhandyman.co.uk 01634 717930 07850 597257 |
#2
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Capacitors
"The Medway Handyman" wrote in message . uk... Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Probably - yes as all these devices have a wide tolerance. To be on the safe side I'd use 20uF in parallel with a 5 or 4.7uF. Do make sure you use the correct type! |
#3
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Capacitors
On Mon, 1 May 2006 12:24:58 +0100, "Fred" wrote:
"The Medway Handyman" wrote in message .uk... Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Probably - yes as all these devices have a wide tolerance. To be on the safe side I'd use 20uF in parallel with a 5 or 4.7uF. Do make sure you use the correct type! and voltage rating. -- Regards, Paul Herber, Sandrila Ltd. http://www.pherber.com/ Electronics for Visio http://www.electronics.sandrila.co.uk/ |
#4
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Capacitors
Fred wrote:
Probably - yes as all these devices have a wide tolerance. To be on the safe side I'd use 20uF in parallel with a 5 or 4.7uF. Do make sure you use the correct type! Thanks Fred. How would I identify the correct type? What am I looking for? -- Dave The Medway Handyman www.medwayhandyman.co.uk 01634 717930 07850 597257 |
#5
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Capacitors
In message , The Medway
Handyman writes Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Sounds a bit high to me Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA -- geoff |
#6
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Capacitors
"The Medway Handyman" wrote in message k... Fred wrote: Probably - yes as all these devices have a wide tolerance. To be on the safe side I'd use 20uF in parallel with a 5 or 4.7uF. Do make sure you use the correct type! Thanks Fred. How would I identify the correct type? What am I looking for? Have a look at the old one and use that as a basis for comparison. I presume the ones you saw in Maplin a http://www.maplin.co.uk/search.aspx?...Menu=y&doy=1m5 which should be OK. To be certain I'd use the 16 and 10uF ones in parallel which give you near enough 25uF. |
#7
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Capacitors
The Medway Handyman wrote:
Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Either. Needs to be 400v AC rated |
#8
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Capacitors
The Medway Handyman wrote:
Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Is it yellow and squarish in shape? if so my guess is its a spark suppressor cap and 30uF will suffice. -- Sir Benjamin Middlethwaite |
#9
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Capacitors
That sounds unlikely with the size of capacitance given. Spark
suppression capacitors require a low ESR to absorb the RF and a capacitor of 25uF is not going to have that typically. Spark suppressors are normally in the 0.1uF range - further I doubt that pressure washers use universal motors so there are no sparks to suppress. I converted a 2kw motor from a broken pressure washer to run my circular saw some time back. In doing so I had to replace the timer capacitor and the start/run capacitors. The timer capacitor in my case was in an electronic circuit and was small - the start/run capacitors were like the ones shown in the Maplin advert and were of that physical size, voltage and tolerance. If it is a timer capacitor it is most likely to be electrolytic and have a tolerance in the order of 50% or more, so any of the values given will do. The Maplin site has a website http://www.lcrcapacitors.co.uk/ - see if that gives any guidance on the accuracy requirement of start/run caps. As pressure washers are run for quite short periods I wouldn't have thought that a slight change would have made much difference and I would go for the 30uF. Rob |
#10
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Capacitors
In article ,
The3rd Earl Of Derby wrote: Is it yellow and squarish in shape? if so my guess is its a spark suppressor cap and 30uF will suffice. Sounds a bit big to me for RF suppression. The range of these tends to be about 0.01 - 1µF. -- *When the going gets tough, the tough take a coffee break * Dave Plowman London SW To e-mail, change noise into sound. |
#11
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Capacitors
The3rd Earl Of Derby wrote:
The Medway Handyman wrote: Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Is it yellow and squarish in shape? if so my guess is its a spark suppressor cap and 30uF will suffice. well its always nice to see complete and utter ignorance displayed on the forum isn't it? |
#12
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Capacitors
In message , The Natural
Philosopher writes The3rd Earl Of Derby wrote: The Medway Handyman wrote: Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Is it yellow and squarish in shape? if so my guess is its a spark suppressor cap and 30uF will suffice. well its always nice to see complete and utter ignorance displayed on the forum isn't it? What forum ? it's a newsgroup -- geoff |
#13
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Capacitors
raden wrote:
In message , The Natural Philosopher writes The3rd Earl Of Derby wrote: The Medway Handyman wrote: Hi All I have an acquaintance who is trying to repair a Bosch pressure washer. The faulty component appears to be a capacitor rated at 25uF. Not sure if it's a start or run capacitor. Maplins stock the same make but only in 20uF or 30uF. Can either of these be used instead - and which one? TIA Is it yellow and squarish in shape? if so my guess is its a spark suppressor cap and 30uF will suffice. well its always nice to see complete and utter ignorance displayed on the forum isn't it? What forum ? it's a newsgroup Whatever. I switch between usenet and other web based discussion areas so much. sometimes I forget which one I'm in. |
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