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Old 04-03-2011, 06:54 AM #33
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Default Re: Feeler: 4 Mode 445 driver

I know you've acknowledged this already - but the size probably needs to be at most half, if not less, of the size.

0.5 inches x 1 inches is probably still too large of a footprint for many builds. There's a weird pivot point here - where once you get hosts large enough to accommodate a large boost driver, you may stop needing a boost driver in the first place, on account of multiple-battery configuration options.


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Old 04-03-2011, 06:57 AM #34
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Default Re: Feeler: 4 Mode 445 driver

Thanks rhd, what is your recommended max size? Over all, its looking promising, the pricing he is giving me is actually pretty decent.
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Old 04-03-2011, 07:04 AM #35
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Default Re: Feeler: 4 Mode 445 driver

Quote:
Originally Posted by bhwollen View Post
I'm looking into buying a bench supply, any suggestions DTR?
I have used the 3A Mastech HY1803D and then I got the 5A HY1505D. I have had no problems with them. The only thing I did not realize was when I traded up to the 5A there is no backlight on the display on that model. Now these are cheap power supplies so 100mA/mV increments. I would at times like to be able to fine tune it a little more but not bad for the price.

3A



5A

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Old 04-03-2011, 07:05 AM #36
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Default Re: Feeler: 4 Mode 445 driver

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Thanks rhd, what is your recommended max size? Over all, its looking promising, the pricing he is giving me is actually pretty decent.
Smaller is better?
I think no dimension can be larger than 1 inch - and less than that would be much better.
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Old 04-03-2011, 07:10 AM #37
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Default Re: Feeler: 4 Mode 445 driver

I understand, but what would you classify the tipping point of too big?
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Old 04-03-2011, 07:17 AM #38
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Default Re: Feeler: 4 Mode 445 driver

Well - with any of the dimensions above perhaps 20mm, you'd have trouble using it in most of the single 18650, or 16340 "kits" offered on the forum.

You'll want to get input from others here... but just think about where you might want to use this driver. Think about the pill size in 18650 hosts you've seen. Sometimes a flexdrive is tough to fit, and those things must be like 14mm.
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Old 04-03-2011, 07:23 AM #39
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Default Re: Feeler: 4 Mode 445 driver

Im going to see if I can get it down to 15mm x 15mm
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Old 04-03-2011, 06:59 PM #40
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Default Re: Feeler: 4 Mode 445 driver

The questions I asked him and all of his responses.

They requested that the driver have memory, for example if the laser were to be turned off and on within 3 seconds, then the mode changes, but if it is longer then 3 seconds then the mode stays the same as the when it was most recently turn off.
We are planning to use a tiny microcontroller so that should be possible.


The size you listed is a problem, I need it to be under 20mm x 20mm and potentially even smaller. I need this thing tiny, the one I am using now is 9mm x 12mm.
The power rating at 4.5V/1.6A works out to be 7.2W which is substantial. Plus we will be using a microcontroller for a single button operation. The dimensions which we gave are just an estimate. After actual board is laid down, we will know the size.

I wanted to clarify that the driver is a constant current driver and not a constant voltage driver?
It is a constant current driver & the current will be well regulated irrespective of the battery voltage dropping on discharge. It is expected to work upto 3V.


Also, if I were to only use the positive input on the driver and connect the negative of the laser and the negative of the battery can it default to high? If not that is ok, it would just help me.
The battery negative & laser negative are the same. The circuit input positive needs to be connected to battery positive & the laser anode to circuit output positive.


Will it have a potentiometer? I didn't think it was necessary but my buyers would like one.
It will not have a potentiometer. If space is not a constraint, we can add a small preset for minor current adjustment, of the order of +/- 20mA


What will be the minimum input discharge amperage of the battery?
The driver is expected to deliver an efficiency of about 90%. Therefore at 4.5V/1600mA load & Li-Ion battery at almost 3V the worst case current from battery will be about 2.66A. We have some design issues at this end.
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Old 04-03-2011, 07:18 PM #41
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Default Re: Feeler: 4 Mode 445 driver

Everything actually looks pretty good there. I'd say ditch the pot, go for smaller size. 20mA +/- is irrelevant.
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Old 04-03-2011, 07:49 PM #42
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Default Re: Feeler: 4 Mode 445 driver

Thats what I told him
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Everything actually looks pretty good there. I'd say ditch the pot, go for smaller size. 20mA +/- is irrelevant.
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Old 04-10-2011, 08:01 PM #43
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Default Re: Feeler: 4 Mode 445 driver

Bump. I should be getting some samples soon.
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Old 04-10-2011, 11:32 PM #44
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Default Re: Feeler: 4 Mode 445 driver

You may want to know, that the link for this GB in your signature is dead. (It just links me to the front page)
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Old 04-11-2011, 01:48 AM #45
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Default Re: Feeler: 4 Mode 445 driver

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Originally Posted by bhwollen View Post
Bump. I should be getting some samples soon.
Awesome!

What have they told you about their final design? Size-wise ?
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Old 04-11-2011, 02:14 AM #46
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Default Re: Feeler: 4 Mode 445 driver

not yet, they are just finishing the design.
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Old 04-19-2011, 01:03 AM #47
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Default Re: Feeler: 4 Mode 445 driver

I'd like some if you get it working like they said. this sounds good.
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Old 04-19-2011, 01:05 AM #48
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Default Re: Feeler: 4 Mode 445 driver

This company is taking for ever! Maybe it is because I keep changing it up on them. lol

They are still working on the design, but said they should be done soon.
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