Please read the description/textbox first. Here I talk (the question is) about how to find out if a 230V/110V to 6 or 12 or 18 V AC transformer is suitable to be used in a HV oscillator circuit (reversed).
That depends for a big part on the windings ratio and the core material. In general we could say: such a transformer performs best on 50 Hertz or 60 Hertz (the frequency where it was made for…...) but that is surely not true. It can perform better.
Much better HV voltages can be taken out in such a circuit where it is used in a reversed way. I even made (in the past) a HV generator with such a transformer that worked properly to make a tube amplifier (anode voltage, say 180 Volts, ECL 82 tube, triode pentode) work. Without any audible audio distortion, say making it oscillate in the 10-15 KC range. When I have time & inspiration I will show that circuit again in a new video.
True: the windings ratio is key. So with 40 windings at a 10 Volt primary coil and 400 windings secondary the ratio is 40 to 400, that is a ratio of 10, so in general with a good core the AC output voltage is 10 V X 10 = 100 Volt, losses not (!) calculated....
Voltage/current losses are normally 10-20 %. But: when the circuit is on its resonance frequency the AC voltage output can pile up very substantially, though the wattage always stays the same (physics theory & practice, conservation of energy).
Please forget (!!! Skip) my side path about how to connect a white LED or a white LED unit to such a HV circuit. It is/was far too complicated to explain in this video. Perhaps I will give much better info and a really working circuit about that in the future.
Anyway: in this video I also take the approach (like earlier) to use a normal 50 Hz or 60 Hz mains transformer “as it is” and test/try them on their properties when they are used in a reversed way, driving them on the low resistance winding with (say) 6 Volt to (say) 18 Volt.
That voltage is “tipped” to the low resistance winding via a button switch or via simply touching the wire of the low resistance winding, adding (say) 6-12-18 V DC to that primary winding.
Please note: I have used a protective resistor in the form of a 21 Watt/12 Volt incandescent lamp that acts as a current limiter in series with the power supply. Many (also high tech & very modern) power supplies are not quick enough to shut off an excessive current.
This is a disclaimer (!) so use that 21 Watt/12 Volt incandescent lamp in series to the transformer winding during this test.
This video refers to two earlier videos and the links are here:
Sloppy 1 transistor coil oscillator https://youtu.be/Y7LctEIantk
Reversed AC 50 or 60 Hz transformer into self oscillation making High Voltage https://youtu.be/3hR_OKAupEY
The question in this video: how to assess that a certain 230 V/110 V at 50 or 60 Hertz transformer is suitable to make a High Voltage?
The test showed here is very primitive, though gives a good indication. Into the primary winding of that (6-12-18 V to 110 V-230V 50 Hertz or 60 Hertz) transformer we add (pulsated) a voltage of say 6 Volt or 12 V or 18 V at (say) 1 Ampère.
Pulsation: by tipping the winding via a 21 Watt/12 Volt incandescent lamp to a voltage/current source of 12 V/18V/at (say) 2 or 3 Ampère.
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