Author Topic: TTL Controller Boards  (Read 77385 times)

Agastar

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Re: TTL Controller Boards
« Reply #480 on: October 24, 2016, 02:33:36 PM »
They isolate pin 8 from 4 & 9.

Yeah, and the one connecting point is supposed to be under the output cap (the 90 deg bend row of vias). I have the power ground connecting through the JST pad as well and that needs to get fixed.

Agastar

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Re: TTL Controller Boards
« Reply #481 on: October 28, 2016, 04:59:05 AM »
@ggallant571 I isolated the bottom pad of the 3 pin JST from ground so that it only connects to the top power ground. I also extended the exposed pad a little bit in hopes that it makes it easier to hand solder, while trying to keep some separation with the solder mask so that it doesn't cause problems for reflow soldering.

If you don't think that will work, let me know and I'll add a larger via on the bottom of the board.

The latest version of the Kicad project can be downloaded from my signature.

Agastar

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Re: TTL Controller Boards
« Reply #482 on: November 03, 2016, 03:18:11 PM »
I just found this laser driver using the same LED2001 as I'm using. This schematic ties the dim pin to Vin so no PWM with this one.
http://www.ilchev.net/laser-driver-led2001

kn4ud

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Re: TTL Controller Boards
« Reply #483 on: November 03, 2016, 03:40:25 PM »
Interesting approach. What about precise control of it .
Allen

ggallant571

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Re: TTL Controller Boards
« Reply #484 on: November 03, 2016, 03:48:14 PM »
I have been using a UCC27537 to drive the power MOSFET on my L6 clone board. Good for use with 3.3V logic.
 
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Agastar

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Re: TTL Controller Boards
« Reply #485 on: November 03, 2016, 04:07:22 PM »
The one in the link is just on or off, no PWM control. In that configuration it would be similar to what is inside the heatsinks in the white goop.

Thanks, I'll look up the specs on the UCC27537

nottingham82

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Laser: 2500mw A5 eleks maker
OS: Windows 10 all in one pc
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http://www.gearbest.com/3d-printers-3d-printer-kits/pp_290386.html Paid $160 in 2016

Agastar

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Re: TTL Controller Boards
« Reply #487 on: November 23, 2016, 10:52:13 AM »
Hey, thanks for posting this link. I had not seen this one before but it does look nice. I may have to get one to see how they built theirs :)

beikeland

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Re: TTL Controller Boards
« Reply #488 on: November 23, 2016, 11:38:54 AM »
Interesting, maybe I can ask Banggood to allow me to upgrade to this when they finally decide to grant me a DOA replacement..

Zax

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Re: TTL Controller Boards
« Reply #489 on: November 23, 2016, 12:29:20 PM »
They'll be on the next model by then  :-\

Agastar

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Re: TTL Controller Boards
« Reply #490 on: December 01, 2016, 12:00:35 PM »
I forgot to post an update in here but the issue with the driver has been fixed and some extras were added as well.

So what changed?
1. The LED2001 ic required the DIM pin to be held high for about 1.3ms when power is first applied to the board before PWM control would work correctly.
This was addressed by adding a one-shot gate (NOT and OR gates with a resistor and capacitor ) to the circuit. This one-shot gate circuit pulls the DIM pin high for about 3ms and simultaneously disables the output. When the 3ms is passed, the one-shot gate returns the DIM pin to ground and re-enables the output.
 
2. I have added a jumper for selecting either the input voltage or 5v for powering the fan.

3. I have added an additional connector that is designed to work with the 12v laser socket on the Eleks boards for controlling the laser power. This gives you two options for PWM control, 5v directly from the arduino or 12v PWM from the laser socket.

4. All pad sizes have been increased for hand soldering this board.

I will be ordering the next batch of boards today or tomorrow and hopefully doing the last round of testing before calling this production ready. As always, the link in my signature has the latest source files.

Thanks

Lob0426

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Re: TTL Controller Boards
« Reply #491 on: December 01, 2016, 01:25:56 PM »
That all sounds good. I especially like the ability to use the stock Laser cable from the kit. That makes it easier for some to upgrade the Laser Module for better PWM/TTL.
Richard
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Agastar

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Re: TTL Controller Boards
« Reply #492 on: December 01, 2016, 01:56:29 PM »
Thanks Richard, the only thing I don't care for is the part count. At 33 components, this is not going to be a quick build lol. The next build with a different chip should be a lot less components :)

PD0RUZ

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Re: TTL Controller Boards
« Reply #493 on: December 05, 2016, 09:29:58 AM »
Where can i get this pcb.. looks really nice...
Have the components in stock overhere..

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Lob0426

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Re: TTL Controller Boards
« Reply #494 on: December 05, 2016, 09:56:26 AM »
At 33 or 23 parts it probably is beyond me to put it together easily. Old age blindness makes it hard to see the dang parts! LOL. My arms just aren't long enough!
Richard
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