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Hi. I found this board in the trash. I think is from a tv, the flyback is to the right of the image, bur the other component to the left, to which the flyback is connected, is a voltage multiplier? Thanks in advance.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
The device in the immediate foreground with the thick red wire connecting it to the LOPT ('flyback') could possibly be a tripler, but is more likely to contain a single filter capacitor and a special high voltage high-megohm bleeder resistor so that lethal voltages can not long remain stored, (a legal requirement in most jurisdictions) and to provide a small load while the picture tube warms up and starts to draw current. The unit may also contain a resistor in series with the output of the LOPT to limit momentary inrush switch-on surge.
Historical: In general, the practice of generating the full EHT voltage in one step from an LOPT 'overwind' ended at the close of the Thermionic Age - certainly no new designs of this type appeared after about 1965.
Thereafter doublers - in black and white TVs - and triplers - in colour TVs and monitors - became the rule rather than the exception until the advent of the 'diode split' EHT technique, where a number of secondaries are linked in series internally by EHT diodes, so the output of the whole unit (the fat red wire) will be unsmoothed raw DC.
The 'diode split' technique became the rule rather than the exception in new TV and monitor designs from the 1980s onwards. Your unit looks like a typical diode-split LOPT.
See what number codes, letters, maker's markers etc you can find on the LOPT, and we have a good chance of finding its data sheet. It's often not easy to distinguish the actual part number from other manufacturing data on the case, so best to make a note of it all just as it appears. In any event, the LOPT EHT output will have been in the neighbourhood of 25 kV, with a pick-off 'focus' output of about 7 kV. Current output at 25 kV will have been of the order of 2mA.
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Is this a voltage tripler?
