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stephan schulz

Member Since: March 20, 2009

Country: Canada

  • Product COM-11850 | about 3 months ago

    i was looking at your bill of materials, because i was wondering if this circuit could be driven with 24v. i need to make it work with an already existing architecture. you are mentioning higher voltage caps. would one also have to use a diode with a higher “Voltage – DC Reverse” ? I think the currently used diode has a rating of 23V. thx

  • Product COM-11850 | about 4 months ago

    i am driving the driver with a PWM signal from a teensy micro controller. it works fine. but the datasheet says: “The CTRL pin is designed to be driven by both 3.3V and 5V logic levels directly from a logic output with either an open drain output or push-pull output stage.”

    i know if i drive the rebel led driver (from sparkfun) with a regular PWM pin from an arduino it will burn the driver, because it too needs an open drain PWM signal.

    so why is the picobuck ok with using a regular PWM?

  • Product COM-11850 | about 4 months ago

    using this opto coupler 6N137 did not work.

  • Product COM-11850 | about 4 months ago

    at this point i tried driving the picoBuck from hardware PWM and software interrupt PWM of an arduino and both method caused flicker.

    then i tried the TLC from an arduino and did not see flicker.

    my preferred option would be using 16 picoBucks via a the 16 channels of a TLC. maybe by using a optocoupler.

    here is a video with the picoBuck on the left and the TLC for the 2 leds on the right: https://www.dropbox.com/s/0srg5wrzc54czh5/2013-12-19%2015.52.10.mp4

  • Product BOB-09370 | about 4 months ago

    could i use 5 of them in parallel? i want to power a bunch of high amp LEDs via a TLC5940 led driver.

    i guess i am asking because the datasheet mentions something about Mhz. I am wondering if the switching frequency of this converter would possible be visible in the LEDs.

  • Product COM-11850 | about 4 months ago

    thanks for the info.

    so if someone would supply the TLC/LEDs with the right voltage (3V), by using a DC switching regulator (24V -> 3v), the efficiency would get better?

    I am not trying to find arguments against the picoBuck. it’s a beautiful setup. I am just noticing that the TLC produces no flicker. See my other post. thx.

  • Product COM-11850 | about 4 months ago

    i’m interested to know how this led driver would compare to something like the TLC5940. certainly this one can handle higher amp leds but when using multiple channel of the TLC one could get similar or more current sinking. i guess i am just hoping to learn a bit more about the different options out there. thx.

  • Product COM-12584 | about 5 months ago

    is this an item you will stock again once these 35 units are sold or this is a one time thing?

  • Product COM-11850 | about 5 months ago

    the drivers work great with a PWM adjust signal. but when looking at the leds through a camera i can see flicker. the flicker changes depending on the PWM frequency but never goes away completely. i am wondering if you had any experience with using a DAC to control the brightness?

  • Product BOK-11730 | about 5 months ago

    i just saw this in a book store, but it said it’s for version 2.0. not sure what the difference is to yours ?

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