Help converting simple schematic to 110v
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From: Michael on 25 Jun 2010 15:58 On Jun 25, 1:43 pm, Bert Hickman <bert-hick...(a)comcast.net> wrote: > Tim Wescott wrote: > > On 06/25/2010 10:01 AM, Bert Hickman wrote: > >> Michael wrote: > >>> Hello, can someone help with converting a schematic from 230v to 110v? > > >>> I came across a schematic for a bug zapper online. I'm interested in > >>> building the device but need help converting the components to 110v. > > >>> Can someone identify appropriate resistors, capacitors and diodes? > > >>> The schematic is available online at: > >>>http://webspace.webring.com/people/bt/tjaco/bugzap/zapper.html > > >>> Thanks in advance. > > >>> - Michael > > >> Simply double the number of stages in the multiplier (currently made up > >> of C1-C6 and D1-D6) and take the output from the end of the modified > >> multiplier. > > > And don't kill yourself! > > > What's the name of that sort of multiplier chain? I forget. > > Hehe... I hear you! The referenced circuit can kill you in a couple of > ways since one end is tied directly to the 240 volt mains, and the > stored energy (4.5 Joules) could also be sufficient to kill even if > isolated by a transformer. > > The cascade circuit is most commonly known as a Cockroft-Walton > multiplier. However, it apparently was first created by Swiss physicist > Heinrich Greinacher in 1919, and is sometimes called a Greinacher > multiplier. This particular design is a half-wave multiplier. Full wave > varieties use a pair of cascade circuits, one for each polarity. > > http://en.wikipedia.org/wiki/CockcroftWalton_generator > > Bert > -- > ******************************************************************** > We specialize in UNIQUE items: coins shrunk by ultra-strong magnetic > fields, Captured Lightning Lichtenberg figure sculptures, and scarce > technical Books. Please visit us athttp://www.capturedlightning.com > ******************************************************************** Hi Bert, thanks for taking the time to reply. You sound like a particularly knowledgeable person. Do you have any thoughts on other safety measures to incorporate to reduce the likelihood of killing something other than bugs? - Michael
From: m II on 25 Jun 2010 16:08 Michael wrote: >>> I came across a schematic for a bug zapper online. I'm interested in >>> building the device but need help converting the components to 110v. Weren't those things shown to kill more beneficial bugs than bad ones? It would be a shame to kill the good ones. Are you designing this thing for indoor use only? Is there an ozone issue? mike
From: Jan Panteltje on 25 Jun 2010 16:56 On a sunny day (Fri, 25 Jun 2010 12:49:36 -0700 (PDT)) it happened Michael <michael.haip(a)gmail.com> wrote in <2faf4582-ffdf-4ee7-9fbc-2081e8c82710(a)j8g2000yqd.googlegroups.com>: >Thanks for the transformer tip. A very smal ltransformer should do (in VA), as tehre is hardly any power used. >Your point on safety got me thinking however. I'm now wondering if I >should incorporate an easy way to discharge the caps in the event I >need to disassemble to perform maintenance or clean. Any suggestions? Maybe a resistor of a few hundred K Ohm over C7, so it automatically discharges if disconnected? If you make it a lower value it will start drawing more then a W. For example Uc7 = 230 x sqrt(2) = 325 V, U^2 is about 10^5, so 100k makes 1 Watt. The time constant then is 10^5 x 10^-4 = 10 seconds for discharge. 100 seconds for 1M.
From: Tim Wescott on 25 Jun 2010 17:05 On 06/25/2010 12:56 PM, Michael wrote: > Thanks. The thought of adding more multipliers did cross my mind. It > also resulted in a realization that the circuit was designed for DC. > Converting to DC and stepping up through a transformer might be the > better way to go. Thoughts? Transformers don't work with DC -- they're AC devices. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: amdx on 25 Jun 2010 18:01
"Michael" <michael.haip(a)gmail.com> wrote in message news:04bd4c14-e044-475c-a2f3-963aa8fd4ae6(a)5g2000yqz.googlegroups.com... On Jun 25, 1:43 pm, Bert Hickman <bert-hick...(a)comcast.net> wrote: > Tim Wescott wrote: > > On 06/25/2010 10:01 AM, Bert Hickman wrote: > >> Michael wrote: > >>> Hello, can someone help with converting a schematic from 230v to 110v? > > >>> I came across a schematic for a bug zapper online. I'm interested in > >>> building the device but need help converting the components to 110v. > > >>> Can someone identify appropriate resistors, capacitors and diodes? > > >>> The schematic is available online at: > >>>http://webspace.webring.com/people/bt/tjaco/bugzap/zapper.html > > >>> Thanks in advance. > > >>> - Michael > > >> Simply double the number of stages in the multiplier (currently made up > >> of C1-C6 and D1-D6) and take the output from the end of the modified > >> multiplier. > > > And don't kill yourself! > > > What's the name of that sort of multiplier chain? I forget. > > Hehe... I hear you! The referenced circuit can kill you in a couple of > ways since one end is tied directly to the 240 volt mains, and the > stored energy (4.5 Joules) could also be sufficient to kill even if > isolated by a transformer. > > The cascade circuit is most commonly known as a Cockroft-Walton > multiplier. However, it apparently was first created by Swiss physicist > Heinrich Greinacher in 1919, and is sometimes called a Greinacher > multiplier. This particular design is a half-wave multiplier. Full wave > varieties use a pair of cascade circuits, one for each polarity. > > http://en.wikipedia.org/wiki/CockcroftWalton_generator > > Bert > -- > ******************************************************************** > We specialize in UNIQUE items: coins shrunk by ultra-strong magnetic > fields, Captured Lightning Lichtenberg figure sculptures, and scarce > technical Books. Please visit us athttp://www.capturedlightning.com > ******************************************************************** Hi Bert, thanks for taking the time to reply. You sound like a particularly knowledgeable person. Do you have any thoughts on other safety measures to incorporate to reduce the likelihood of killing something other than bugs? - Michael I would recommend an isolation transformer, you can build that with two back to back transformers. In other words 120v to12v[]12v to 120v, but if you go this route you may as well use a transformer with dual primaries and series the primaries on one so you get; 120v to 12v[]12v to 240v, then build the circuit as per the diagram. Mike |