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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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I need a 10-15KV supply for an electronic air filter.
Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. Thanks, mike |
#2
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![]() "mike" I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. ** Have you any idea how a CRT TV even works? Horizontal deflection and EHT are derived from the same circuit. Some smaller sets use the PSU as a source for both the above. Removing the EHT supply is simply not possible. BTW: Colour sets have mostly 20kV to 26kV on the tube. Small B&W sets might be closer to your range. .... Phil |
#3
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On 2/24/2012 6:58 PM, Phil Allison wrote:
"mike" I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. ** Have you any idea how a CRT TV even works? Yes, I do, thanks for asking. Horizontal deflection and EHT are derived from the same circuit. So? I didn't ask for a lesson in TV operation. I asked for advice on how big a TV to get for 10-15KV. Some smaller sets use the PSU as a source for both the above. Removing the EHT supply is simply not possible. Methinks you need to be more creative. I'm CERTAIN that I can saw off the portion of the board containing the flyback transformer and associated parts to build the supply I need. I'd just like to start with a transformer/voltage multiplier designed for the range of voltage I need. BTW: Colour sets have mostly 20kV to 26kV on the tube. Small B&W sets might be closer to your range. Yes, I know smaller sets might be closer. Just would like to have some idea of how much smaller. I've already got 5KV supplies. I don't need to acquire any more free E-waste than necessary. Thought some TV repair guy might have a rule of thumb on the tip of his tongue. I'm still optimistic that someone with more interest in answering the question than denigrating the questioner might show up. |
#4
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![]() "mike = ****HEAD" I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. ** Have you any idea how a CRT TV even works? Yes, I do, thanks for asking. ** Blatant lie. Horizontal deflection and EHT are derived from the same circuit. So? ** Try reading the whole post before making and ASS of yourself. ****HEAD !! I didn't ask for a lesson in TV operation. ** But you desperately NEED one - ****HEAD !! Some smaller sets use the PSU as a source for both the above. Removing the EHT supply is simply not possible. Methinks you need to be more creative. ** Me thinks, you need, to go get ****ED. I'm CERTAIN that I can saw off the portion of the board containing the flyback transformer and associated parts to build the supply I need. ** You are not certain if your fat ARSE is on fire. ****HEAD !!! BTW: Colour sets have mostly 20kV to 26kV on the tube. Small B&W sets might be closer to your range. Yes, I know smaller sets might be closer. ** Read what I actually wrote - ****HEAD !!! I'm still optimistic ... ** You are lucky to be alive. You **** for brains, stinking ignorant pig. |
#5
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On 2/24/2012 8:01 PM, Phil Allison wrote:
snip Take your meds! |
#6
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"mike" wrote in message
... I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? There isn't one. Alternative sources for free HV supplies at near zero current would also be helpful. Dunno about free but google cockcroft-walton voltage multiplier. Don't forget the megohms series resistor. old guy I was surprised I found nothing on ebay. Thanks, mike |
#7
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![]() "mike = TROLL " ** Eat a box of rat bait - ****head. |
#8
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On 2/24/2012 10:18 PM, John Smith wrote:
wrote in message ... I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? There isn't one. Are you saying that a 5" CRT is likely to have the same high voltage as a 20" CRT? Alternative sources for free HV supplies at near zero current would also be helpful. Dunno about free but google cockcroft-walton voltage multiplier. Don't forget the megohms series resistor. old guy I was surprised I found nothing on ebay. Thanks, mike |
#9
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Folks asking for sources of parts sources should state where they are
located. The TV (cheap/free) HV section would likely require considerable effort and additional circuitry to reassemble a working circuit, which would likely then be iffy as far as reliability and safety issues, especially when utilizing used parts. A new HV PSU, often contained in a compact metal enclosure, from a surplus supplier would be a much better option IMO. Places like Fair Radio Lima OH may have new surplus HV modules/supplies made specifically for CRT equipment (not TVs) which may only require a common AC input voltage, and include a HV lead. I bought one of these types from Fair Radio years ago, to replace a CRT HV supply in a large engine analyzer with a 10" CRT. CRT HV supplies in TVs can be from ~1.5kV for small portables to over 30kV for large table models. There are likely new surplus electrostatic HV supplies available from surplus suppliers. There are probably numerous DIY plans online for HV supplies for all sorts of demonstration and experimental purposes. HV supplies are also used in oil furnaces, and various other types of commercial/industrial equipment. -- WB .......... "mike" wrote in message ... I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. Thanks, mike |
#10
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mike wrote:
I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. Thanks, mike That seems too high for a typical plate cleaner. 10 kv will arc at about 1 cm. 5kv seems more reasonable. It's usually easier to find positive supplies. Is it an ion type cleaner ? I use these for low current. http://www.goldmine-elec-products.co...p?number=g1783 |
#11
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On Fri, 24 Feb 2012 13:36:40 -0800, mike wrote:
I need a 10-15KV supply for an electronic air filter. The down side of an ESP (electrostatic precipitator) is that it generates oxides of nitrogen and ozone, which rots lungs and rubber parts. Anything that produces a corona discharge, will also produce ozone. Most of the complex design of the ESP plates, panels, and wires, are to minimize ozone production. You might want to borrow or rent an ozone meter to be sure your contrivance works. The ozone monitors are not cheap: http://www.ozonesolutions.com/Ambient_Ozone_Monitors.html Mo http://www.hamonusa.com/hamonresearchcottrell/services/maintenance/ozone http://www.commercialaircleaner.net/blog/learn-why-a-esp-air-cleaner-and-an-ozone-generator-are-not-the-same-thing/ etc... -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#12
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On Fri, 24 Feb 2012 13:36:40 -0800 mike wrote in
Message id: : I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. How about using an oil burner transformer? IIRC they're about 10KV or so... |
#13
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On 2/24/2012 4:36 PM, mike wrote:
I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. Thanks, mike You might want to look at a scope chassis from something like the Tek 2213A/2215A. The power supply and EHT circuit is very simple and could easily be isolated, its about 14KV. You could probably saw out the power section. JC |
#14
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JW wrote:
On Fri, 24 Feb 2012 13:36:40 -0800 wrote in Message : I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. How about using an oil burner transformer? IIRC they're about 10KV or so... 23 mA is a *lot* of current for this application. A dangerous lot of current. --Winston |
#15
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On Mon, 12 Mar 2012 16:32:09 -0700, Winston
wrote: JW wrote: On Fri, 24 Feb 2012 13:36:40 -0800 wrote in Message : I need a 10-15KV supply for an electronic air filter. Thought I'd pick up a free CRT TV and take the anode supply out. What's a typical relationship between CRT size and anode voltage? Alternative sources for free HV supplies at near zero current would also be helpful. I was surprised I found nothing on ebay. How about using an oil burner transformer? IIRC they're about 10KV or so... 23 mA is a *lot* of current for this application. A dangerous lot of current. --Winston I dare say. That is in the power range of dental x-ray machines. ?-) |
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