Part 2 of the video’s where I show how to find out all kinds of windings on transformers. In this case a HV line transformer for 16 KC, out of an old school analog TV set.
Please read the textbox first (the warning regarding High Voltage circuits!). In video 1 my camera stopped suddenly, so I had to make this second video, part 2.
Anyway: 2 video’s about how to find out the wiring of unknown transformers, say bought on radio flea markets. Here the primary coils/coil of a 16 KC line transformer are measured and find out.
Important/strange: between pins 3 and 5 there seems to be a shortcut in the showed schematic (!) but the measurements are “as they are” (…). All has to be worked out further by getting this 16 KC oscillator into service + to find the best 2 coils with their central tap (watch the schematic) to which these 2 Darlingtons of 2 x BD 139 can drive out the HV coil at its utmost HV voltage, say 2000 Volt on 16 KHz, the natural resonance of this ferrite HV transformer unit.
I talk in both video’s about finding out primary windings of unknown transformers. That is a very broad range of course. Transformers (unknown or well known) could be made to be connected to (say) 230 V AC or 110 V AC (50 Hz/60 Hz). But also to supply sources on other frequencies, here 16 KC.
In case of an old school HV oscillator on say 16 KC for a cathode ray tube such an oscillator can be supplied by any DC voltage. Look at (say) old school cathode ray tube B/W or color television sets, their supply voltage is in general DC, made directly out of the mains supply, 110V/230 V/50/60 Hz.
For portable analog TV sets the 16 KC line oscillator (driving the HV to make the cathode ray tube to light up) often was supplied via 12 Volt DC.
Whatever: primary coils/windings on an unknown transformer are often the most problematic to be found out, but with (say) a transformer with many coils on the secondary (!) that could also be problematic.
Though the things that I show here (DC measurements and their DC Ohms value ) and finding out the different coils and their central taps could work very well. Take a very close look on your Ohms meter (!) and always shortcut the test wires first + align the meter to “zero”.
Go to video 1 for much more info about the principles.
Link is here [ Ссылка ]
Warning: be very careful with HV oscillators. Avoid/block that children of people with heart problems or elderly or people with a pacemaker can get into contact with that HV wire and/or an electric fence, be it giving out AC or DC.
All voltages higher than 60 Volt are potentially dangerous! (standard safety used in old school telephone lines). Again: be very careful (!). Don't get in contact with a wire coming out of that (yellow) HV television coil. Avoid contact and use a well insulated plier when you want to pick up the wire coming out of that (yellow) HV television coil.
There are more than 1000 Video’s on my YT channel. I only do analog electronics: audio amplifiers, analog measuring devices, radio circuits, many Shortwave radios, many oscillators HF and audio, other audio & shortwave circuits.
Also many (test) generators for all kinds of waveforms, both in the audio range and HF. Also simple “switch” circuits like the Schmitt triggers acting on different input voltages, 555 circuits and circuits of basic electronics issues like “Ohms law”, resistance properties, capacitance properties, the capacitors testing process, electronic “matching” in audio circuits and audio amplifiers, audio pre amplifiers, microphone amplifiers, etc. In all cases you find the schematic inserted in the video.
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I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I can not help that these things happen. Upload 12 August 2021.
