Help converting simple schematic to 110v
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From: Martin Riddle on 25 Jun 2010 19:18 "Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message news:i02nqm$82s$1(a)news.albasani.net... > On a sunny day (Fri, 25 Jun 2010 09:38:59 -0700 (PDT)) it happened > Michael > <michael.haip(a)gmail.com> wrote in > <2f4911c6-23d1-4ecf-841a-2bc2626f7eb2(a)y4g2000yqy.googlegroups.com>: > >>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 > > Auto-transformer (a 230V transformer with a 110 V tap). > You could also use 2 transformers, say a 100 to 12 transformer > connected to a 12 to 230 transformer. > Is not this thing dangerous for humans too? > Better have it in an isolated cage with a light to attract the bugs. > What if the Light attracts Humans? What agency do we call?
From: Tim Williams on 25 Jun 2010 22:01 "Tim Wescott" <tim(a)seemywebsite.now> wrote in message news:i9udnXFJqoHJh7jRnZ2dnUVZ_ridnZ2d(a)web-ster.com... > 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. Well, I do that here, http://myweb.msoe.edu/williamstm/Images/Tubescope_Supply.gif but calling it DC anymore is a bit of a misnomer. Incidentially, the 2kV output could also be used to zap bugs, but for its intended purpose, it is more likely to zap only technicians: http://myweb.msoe.edu/williamstm/Images/Tubescope6.jpg (see zener stack and 0.01uF cap on the visible edge) Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Michael on 25 Jun 2010 22:49 On Jun 25, 5:01 pm, "amdx" <a...(a)knology.net> wrote: > "Michael" <michael.h...(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 Thanks for the recommendation. Do I need anything else between the two transformers (diode?) to prevent potential back flow of voltage from the 12v to 240 to the 120v to 12v? - Michael
From: MC Haip on 26 Jun 2010 00:02 On Jun 25, 3:56 pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > On a sunny day (Fri, 25 Jun 2010 12:49:36 -0700 (PDT)) it happened Michael > <michael.h...(a)gmail.com> wrote in > <2faf4582-ffdf-4ee7-9fbc-2081e8c82...(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. Thanks for the help. Can you confirm if this this what you are suggesting? https://docs.google.com/leaf?id=0ByeTqxcQsAnPNGMxNTFmODUtODI5NS00ZmExLWI4YzgtN2VkMDQyMjhjODU5&sort=name&layout=list&num=50
From: Michael on 26 Jun 2010 00:21
On Jun 25, 4:05 pm, Tim Wescott <t...(a)seemywebsite.now> wrote: > 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 consultingwww.wescottdesign.com Hi Tim, thanks for clarifying. My lack of electronics knowledge is showing. Question I have about the schematic then is whether it is designed for a AC or DC main... I suspect it is DC however perhaps it doesn't matter? Michael |