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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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H&M Powermaster transformer/controller (blown capacitor)
An update on an earlier post. Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor. Question is, can I just solder in a new one to replace the old, and if so, what? In other words, is there a modern replacement? Thanks! -- Graeme |
#2
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H&M Powermaster transformer/controller (blown capacitor)
On 03/11/2019 11:46:48, Graeme wrote:
An update on an earlier post.Â* Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor.Â* Question is, can I just solder in a new one to replace the old, and if so, what?Â* In other words, is there a modern replacement? Thanks! I would recommend a polypropylene axial capacitor, like: https://uk.rs-online.com/web/p/polyp...itors/1731901/ You may get cheaper, perhaps look on eBay. Polypropylene caps are rugged and self-healing. The only issue is their max temp of 105C which I hope isn't going to be an issue. Having a rethink, without knowing more about the device I'm not certain this cap does any more than noise suppression and it's failure may be a red herring. Best check the transformer first or the fuse if there is one. |
#3
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H&M Powermaster transformer/controller (blown capacitor)
In message , Fredxx
writes Having a rethink, without knowing more about the device I'm not certain this cap does any more than noise suppression and it's failure may be a red herring. Best check the transformer first or the fuse if there is one. Interesting, thanks. Yes, the fuse in the plug blew, so it would be OK to remove the blown capacitor then reassemble, fit a new fuse in the plug and test the output with my trusty analogue multi meter? Assuming the cap really is only noise suppression, it may not even warrant replacement? -- Graeme |
#4
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H&M Powermaster transformer/controller (blown capacitor)
On 03/11/2019 12:48, Graeme wrote:
Interesting, thanks.Â* Yes, the fuse in the plug blew, so it would be OK to remove the blown capacitor then reassemble, fit a new fuse in the plug and test the output with my trusty analogue multi meter? yes Assuming the cap really is only noise suppression, it may not even warrant replacement? I still would. -- €œIt is hard to imagine a more stupid decision or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong.€ Thomas Sowell |
#5
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H&M Powermaster transformer/controller (blown capacitor)
In message , The Natural Philosopher
writes On 03/11/2019 12:48, Graeme wrote: Interesting, thanks.* Yes, the fuse in the plug blew, so it would be OK to remove the blown capacitor then reassemble, fit a new fuse in the plug and test the output with my trusty analogue multi meter? yes Thank you. I wondered afterwards whether noise referred to interference with TVs and radios, or noise as in voltage stabilisation. -- Graeme |
#6
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H&M Powermaster transformer/controller (blown capacitor)
Graeme wrote:
In message , The Natural Philosopher writes On 03/11/2019 12:48, Graeme wrote: Interesting, thanks. Yes, the fuse in the plug blew, so it would be OK to remove the blown capacitor then reassemble, fit a new fuse in the plug and test the output with my trusty analogue multi meter? yes Thank you. I wondered afterwards whether noise referred to interference with TVs and radios, or noise as in voltage stabilisation. The former, although not necessarily very effective. If as it appears this capacitor is across the mains[1] then you should get one specifically rated for this service and preferably the same value (0.1 microfarad). This is generally called an X rated capacitor, suitable for mains filters at 240v, in the description But they are fairly cheap and reliable if from a reliable supplier. Fortunately I think it is fairly likely that failure of this capacitor caused the original fault. [1] In the unlikely event that the capacitor goes from one side of the mains to earth then you probably don't want to replace it, for reasons that could be discussed if this applies. -- Roger Hayter |
#7
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H&M Powermaster transformer/controller (blown capacitor)
Graeme wrote on 03/11/2019 :
Thank you. I wondered afterwards whether noise referred to interference with TVs and radios, or noise as in voltage stabilisation. Noise as in interference to TV and radio, from the train's poor contact with the track and commutator noise. |
#8
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H&M Powermaster transformer/controller (blown capacitor)
On 03/11/2019 11:46, Graeme wrote:
An update on an earlier post.Â* Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor.Â* Question is, can I just solder in a new one to replace the old, yes and if so, what? 0.1µF 750V https://www.ebay.co.uk/p/JB-Capacito...tor/1070659712 630V should be enough for any mains application. In other words, is there a modern replacement? Yes. Thanks! -- No Apple devices were knowingly used in the preparation of this post. |
#9
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H&M Powermaster transformer/controller (blown capacitor)
The Natural Philosopher wrote:
On 03/11/2019 11:46, Graeme wrote: An update on an earlier post. Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor. Question is, can I just solder in a new one to replace the old, yes and if so, what? 0.1µF 750V https://www.ebay.co.uk/p/JB-Capacito...Metallized-Pol yester-Capacitor/1070659712 630V should be enough for any mains application. In other words, is there a modern replacement? Yes. Thanks! Should be enough,[1] yes, but at this point in the cirtuit - mains input - a capacitor specifically rated as a mains filter capacitor should be used. [1] It isn't actually: 230 x 1.05 x 2 x 1.414 = 683V -- Roger Hayter |
#10
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H&M Powermaster transformer/controller (blown capacitor)
Roger Hayter wrote:
The Natural Philosopher wrote: On 03/11/2019 11:46, Graeme wrote: An update on an earlier post. Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor. Question is, can I just solder in a new one to replace the old, yes and if so, what? 0.1µF 750V https://www.ebay.co.uk/p/JB-Capacito...Metallized-Pol yester-Capacitor/1070659712 630V should be enough for any mains application. In other words, is there a modern replacement? Yes. Thanks! Should be enough,[1] yes, but at this point in the cirtuit - mains input - a capacitor specifically rated as a mains filter capacitor should be used. [1] It isn't actually: 230 x 1.05 x 2 x 1.414 = 683V Sorry! the EU confused me: 230 x 1.1 x 2 x 1.414 = 715V -- Roger Hayter |
#12
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H&M Powermaster transformer/controller (blown capacitor)
On Sunday, 3 November 2019 11:46:58 UTC, Graeme wrote:
An update on an earlier post. Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor. Question is, can I just solder in a new one to replace the old, and if so, what? In other words, is there a modern replacement? Thanks! It's a paper 0.1uF 750v. The high v rating suggests it's across the mains, in which case replace it with a 0.1uF X2 type cap, they're generally rated to 275v ac. It ought to work ok without the cap. The unit also has a metal rectifier by the look of it. I hope it's not selenium... Best power it up outdoors. NT |
#13
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H&M Powermaster transformer/controller (blown capacitor)
On 03/11/2019 11:46, Graeme wrote:
An update on an earlier post.Â* Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor.Â* Question is, can I just solder in a new one to replace the old, and if so, what?Â* In other words, is there a modern replacement? It looks like that was just a mains filter cap. If it was across the mains (as its working voltage would suggest) then it may have failed short and taken out the plug fuse when it failed. If you chop it out, replace the fuse and re-test then chances are all will be well. You can then replace it with a modern mains input suppressor - these normally have a 0.1uF cap in series with a 100R resistor, like: https://www.rapidonline.com/lcr-fe-s...etwork-26-5857 -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#14
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H&M Powermaster transformer/controller (blown capacitor)
On 03/11/2019 11:46, Graeme wrote:
An update on an earlier post.Â* Partial dismantle completed, and images here : http://www.binnsroad.co.uk/misc/powermaster/ Plenty of wax, presumably from the capacitor.Â* Question is, can I just solder in a new one to replace the old, and if so, what?Â* In other words, is there a modern replacement? Thanks! I can't see a proper earth on that thing. Gaugemaster do nice new ones with a lifetime warranty. I bought a s/h four channel one with one faulty channel and sent it back and they repaired it without question. |
#15
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H&M Powermaster transformer/controller (blown capacitor)
In message , "dennis@home"
writes On 03/11/2019 11:46, Graeme wrote: http://www.binnsroad.co.uk/misc/powermaster/ I can't see a proper earth on that thing. The earth is soldered directly to the side of the transformer. Gaugemaster do nice new ones with a lifetime warranty. I bought a s/h four channel one with one faulty channel and sent it back and they repaired it without question. Gaugemaster are good, but not enough amps for 0 gauge. Bench power supplies are great, 0-20v (some 0-30v), up to 5 amps. The Powermaster supplies 0-12v up to 2.5 amps, which is plenty for most locos, and far more than a Duette or other, similar, later models. -- Graeme |
#16
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H&M Powermaster transformer/controller (blown capacitor)
On 04/11/2019 19:10, Graeme wrote:
In message , "dennis@home" writes On 03/11/2019 11:46, Graeme wrote: Â*http://www.binnsroad.co.uk/misc/powermaster/ I can't see a proper earth on that thing. The earth is soldered directly to the side of the transformer. Gaugemaster do nice new ones with a lifetime warranty. I bought a s/h four channel one with one faulty channel and sent it back and they repaired it without question. Gaugemaster are good, but not enough amps for 0 gauge.Â* Bench power supplies are great, 0-20v (some 0-30v), up to 5 amps.Â* The Powermaster supplies 0-12v up to 2.5 amps, which is plenty for most locos, and far more than a Duette or other, similar, later models. the guagemaster do 2.5A |
#17
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H&M Powermaster transformer/controller (blown capacitor)
In message , "dennis@home"
writes On 04/11/2019 19:10, Graeme wrote: Gaugemaster are good, but not enough amps for 0 gauge. the guagemaster do 2.5A I'll investigate - thanks. Got the Powermaster reassembled today, after unsoldering and removing the blown capacitor. Good job I took plenty of pictures! New 3A fuse and yes, it powers up. Checked output with multi meter and all as expected. Left sitting on but with no load for 3/4 of an hour, then used for 5 minutes, drawing about 8v, 0.6 amps. Case slightly warm, as usual, and the usual mild electrical smell, but nothing untoward. Success! Thank you, all! Two more to investigate, now. -- Graeme |
#18
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H&M Powermaster transformer/controller (blown capacitor)
On 04/11/2019 22:42, Graeme wrote:
In message , "dennis@home" writes On 04/11/2019 19:10, Graeme wrote: Gaugemaster are good, but not enough amps for 0 gauge. the guagemaster do 2.5A I'll investigate - thanks. the cheapest option is the panel mounting controllers and a toriodal transformer from somewhere like cpc. the cased gaugemaster controls are quite expensive. IIRC an O gauge panel is about £60 and the same thing in a case with transformer about 200.You could buy a 20A 12V PSU of ebay and a 10A buck converter to modify modify (replace the 10 turn pot with a normal one) for about £20 the pair. |
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