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I want to make an external power supply for my Godox TT685N, and I have two questions:

  1. There are 3 pins on the connector (I found, that this is same conector like Canon) What is the pinout of this connector?

  2. I found that the voltage on this connector is about 300V. Is this correct?

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Yes, the voltage is approximately 300 volts and here is a diagram showing the pin connections:

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You can buy a complete unit for as little as $27. It doesn't make sense to try and design your own. The have complex electronics inside.

Ebay Flash battery packs

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  • Why is this voltage so high? How can I DIY make left pin "Output logic control signal..."? – marcel3032 Dec 26 '17 at 16:14
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    They are high voltage in order to charge the flash faster. I wouldn't bother trying to design one yourself. It would be much simpler to buy one from ebay for as little as $27. ebay.com/sch/… – Mike Sowsun Dec 26 '17 at 17:14

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