I am trying to repair the flash of a P900 camera, since it gives a burning smell after being used.

After disassembling the flash unit, I came across this part for which I need some professional eyes in order to identify what kind of component that is.

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  • 3
    \$\begingroup\$ Looks like a teeny-tiny auto-transformer for generating the high voltage for the flash. Is that the hot shoe it's attached to? \$\endgroup\$
    – brhans
    Mar 24, 2021 at 14:27
  • 1
    \$\begingroup\$ Looks to me like the trigger coil. Is there a 3rd wire going to it on the underside perhaps ? \$\endgroup\$ Mar 24, 2021 at 14:28
  • \$\begingroup\$ Nikon Coolpix P900 is a nice camera (irrelevant of course). \$\endgroup\$
    – Andy aka
    Mar 24, 2021 at 14:33
  • \$\begingroup\$ thanks for the quick replies. i added another image to the question. \$\endgroup\$ Mar 24, 2021 at 14:39
  • 1
    \$\begingroup\$ Nikon Coolpix P900 Camera Pop-Up Flash w/ View Finder Assembly Replacement Part ebay.com/itm/… \$\endgroup\$
    – tlfong01
    Mar 24, 2021 at 14:39

1 Answer 1


It is the trigger transformer that provides high voltage to the trigger plate in the bulb. This ionises the gas inside the tube, making it conductive and thereby initiating the flash.

A more in depth explanation of the operating principle of such a flash circuit can be found here.

  • \$\begingroup\$ i see, thanks for the fast answer. is dc or ac supplied to the bulb itself? \$\endgroup\$ Mar 24, 2021 at 14:52
  • 1
    \$\begingroup\$ @abdussamed17 DC. A charging circuit charges up a capacitor with a high DC voltage which is applied across the bulb, ready to go. A pulse on the trigger plate ionises the gas in the tube allowing the DC voltage to arc trough. \$\endgroup\$ Mar 24, 2021 at 14:57

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