I have a thermal camera whose external shutter doesn't close when commanded to by the camera. I think it is a current issue. Something is fried or worn out within the camera's electronics. The shutter works fine as I can get it to close by applying Vcc to the correct pin on the shutter. When the camera commands pin A to go high, it goes high, but all that happens is there is a very high pitched whine heard from the camera and the shutter never closes. Vcc is 3v, and when A goes high it is also 3v. How would I make it so that when A goes high, a switch is closed connecting Vcc to A?

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  • \$\begingroup\$ If something is "fried or worn," then it seems that your best bet would be to address than rather than adding circuitry. \$\endgroup\$
    – Edward
    Feb 7, 2017 at 2:01
  • \$\begingroup\$ Sure, but we can't in this situation. It's within the tiny, tiny, sealed thermal camera. \$\endgroup\$ Feb 7, 2017 at 2:06
  • 1
    \$\begingroup\$ Uhh I smell a short circuit here... potentially. \$\endgroup\$
    – Bradman175
    Feb 7, 2017 at 2:17

1 Answer 1



simulate this circuit – Schematic created using CircuitLab

  • \$\begingroup\$ I can't add anything between the black box (the camera) and the shutter. I can only use the fact that A goes high to initiate some action (like the closing of a switch). \$\endgroup\$ Feb 7, 2017 at 4:49
  • \$\begingroup\$ Then without more details on the interface, I cannot help \$\endgroup\$ Feb 7, 2017 at 13:33

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