apparently the #NYT hadn’t heard of an electric #flyswatter until 02026
on 02026-09-03electric #flyswatter #electronics is normally limited to 45μC and 5mA for safety
on 02026-09-03another #video, by #randomtronic, of the #electronics #hardware in a 1.5kV #flyswatter. From a distance it looks like the same design as the contemporary bigclive video, but he has the transformer’s primary winding on its collector as you’d expect — but with a series resistor, which you wouldn’t. And only 7.2MΩ of bleeder resistance, and a slightly different voltage multiplier design, which he describes as “confusing as hell”. He is also skeptical of the transistor pinout he got from the datasheet, so he plugged it into his TransistorTester and found that the terminals were backwards. But the primary of the transformer is still on the transistor’s emitter, as in bigclive’s analysis, rather than its collector. His understanding of how the Joule Thief works is the same as mine and different from the explanation given by bigclive in the previous video, with the current switched by transistor turning it off rather than further on.
on 02024-05-09older #bigclive #video on the #electronics #hardware in an electric #flyswatter, labeled as 1.5kV. It uses a (slightly weird) Cockcroft–Walton voltage multiplier on the transistor output, terminating in an 0.022μF kV cap with a 44MΩ bleeder, and has the primary side of the transformer on the (8050SS) transistor’s emitter (!) rather than its collector but otherwise a similar circuit to the later video.
on 02024-05-09#bigclive #video on the #electronics #hardware in an electric #flyswatter. The circuit is extremely simple! A transformer, a transistor (C2328A 30V 2A 1W), a 560Ω resistor, a diode, an 0.33μF 630V film storage capacitor, a 2.2MΩ bleeder resistor for it, and a probably unnecessary LED (with its own 560Ω resistor) and power button. It all runs off 3 volts from two AAs. It’s a blocking oscillator, basically a Joule Thief with a high-voltage secondary which is half-wave rectified into the storage cap; the resistor limits the current into the base of the transistor. Although I think I may have misunderstood how the Joule Thief works — he says the feedback winding turns the transistor on more until the core saturates, at which point it starts turning off. The two primary-side windings attached to the transistor are 1.5Ω each, and the high-voltage secondary is 150Ω. A commenter says his is 1500V, and he altered the output to 1μF 10MΩ for a “nice loud bang”.
on 02024-05-09