To: High Voltage record Subject: Re: Switch-mode supply for bug zapper (fwd) You want the elements for the steel you intend to make use of. Differing kinds have totally different losses. You obtain this from the mfgr. Digi-Key has some inexpensive IR sort emitters & detectors. Have the fly crawl a distance, like 4-6 inches inside the tube, and then, he triggers the IR beam which controls the zapper. A small single ended NST works nice for this utility. The present will burn them proper up. The fly hits the IR beam on the 1/2 mid-approach level which energizes a small grid in each path. The midpoint has a piece 2 inches long with no grid. They turn into trapped and cannot exit either path without getting zapped. You could possibly additionally use a 600 Ohm to 10K audio xmfr. They make good HV sparks operating in a pulsed mode. If the time duration is short, like 1-2 sec, they could additionally cost a cap rectified with a 1/2 wave diode in a short while interval. Then the charged cap waits for the fly. The charging cycle happens every 5 minutes and is controlled by a 555 IC chip --- a small relay controls the power section. You place sugar crystals within the tube and at the top of the tube use a small glass test tube so you possibly can see your accumulated flies to regulate the time durations. The flies will accumulate after which try to go out the charged grid section. The one now we have uses a traditional laminated iron, 50Hz transformer. I'd like, so I'm looking at making a switchmode version. 2) Ditto for sizing the components for the snubber. HV rectification and that I'd need a string of excessive-pace diodes.
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