Thoughts? Variable Voltage Perfboard Layout for OKR-T/6

[Chris Brown]

Can any of you smart modders look this over and add your thoughts?

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It's based on the okr-t/6 datasheet as well as these threads:
http://www.e-cigarette-forum.com/forum/modding-forum/191607-easy-okr-t-vv-mod.html
http://www.e-cigarette-forum.com/forum/battery-mods/193434-low-voltage-cut-out.html
http://www.e-cigarette-forum.com/forum/battery-mods/114901-evercool-variable-voltage-mod.html

For anyone that hasn't used perfboard.. it's a great medium for leaded components... I build guitar fx circuits with it regularly... newbies look here: Physical Computing at ITP | Tutorials / Soldering A Perf Board

 

[CapeCAD]

I believe your zener is backwards. You need the zener to prevent power from getting to the control pin unless the battery voltage is greater than the breakdown voltage. You may need a higher value Zener depending on what you use as the control pin does not require a high voltage to activate and may run down lower than you want.

You also may want the led to connect to the other side of the zener so it will not light unless the voltage is high enough to enable the control pin.

Other than that it looks good to me.

 

[Chris Brown]

I believe your zener is backwards. You need the zener to prevent power from getting to the control pin unless the battery voltage is greater than the breakdown voltage. You may need a higher value Zener depending on what you use as the control pin does not require a high voltage to activate and may run down lower than you want.

You also may want the led to connect to the other side of the zener so it will not light unless the voltage is high enough to enable the control pin.

Other than that it looks good to me.

Thanks for checking the layout for me! The op has been updated.

Sure enough the zener was backwards... I also moved the LED. I'll play with the zener value when I get this thing put together... As is the zener should stop conducting when less than 6.6V is applied to it, or am I missing something? I haven't used a zener for this type of application before. Control pin specs at 1.5V+ to activate.

Thanks for sharing the knowledge.

 

[CapeCAD]

Thanks for checking the layout for me! The op has been updated.

Sure enough the zener was backwards... I also moved the LED. I'll play with the zener value when I get this thing put together... As is the zener should stop conducting when less than 6.6V is applied to it, or am I missing something? I haven't used a zener for this type of application before. Control pin specs at 1.5V+ to activate.

Thanks for sharing the knowledge.

You got it right, but there is some tolerance (10% or more depending on temperature). I've tried a handful of zeners/values and got varying results.

 

[Chris Brown]

OK... built this and it vapes great! I have a vv that uses a ptn04050 so I'll be comparing them. The only issue is that the 10K seems to divide too much voltage so after the zener there isn't enough voltage to power the LED... I hooked my led up before the zener to solve this but adjusting the 10K would be the proper solution.

Thanks for the help!!