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[DPRG] current conversion [and much more]

Subject: [DPRG] current conversion [and much more]
From: montgomery f. tidwell mtidwell at practicalmatters.com
Date: Tue Jul 24 12:46:49 CDT 2001

Howdy,

pray tell, what is a bench supply?


                     \\//_


R. Bickle wrote:

> OK, Sounds like you have the right idea, you just can't get enough current
> from a 9V transistor battery. Look into a battery with a higher AH rating.
> First, take the battery out and measure the current draw at 9V with a bench
> supply to determine what size battery you'll need.
> 
> Rick
> 
> -----Original Message-----
> From: dprglist-admin at dprg.org [mailto:dprglist-admin at dprg.org]On Behalf
> Of montgomery f. tidwell
> Sent: Tuesday, July 24, 2001 11:55 AM
> To: DPRGlist
> Subject: Re: [DPRG] current conversion [and much more]
> 
> 
> Howdy,
> 
> maybe i'm trying to dictate an answer when i don't fully understand the
> problem.
> 
> i've created a line-follower that has (a) Super TComp, (b) LCD Serial
> Backpack, (c) 4 HS303 servos, (d) custom line sensor with 3 LED/CDS
> pairs. (a) was powered by a 9V, and everything else came from a 5V
> line off (a).
> 
> the input requirements are: (a) 6-26V, (b) 4.8-5.5V, (c)4.8-6V,
> (d) 5V (much higher and the LEDs burn out).
> 
> i have found that if more than one servo is active, the LCD goes
> blank. i assume that the servos are taking too much power for the
> LCD to operate.
> 
> so i thought that it might be better to have one 9V for (a), and
> one something else (regulated to 5V) for everything else. i don't
> really want a different battery for every part.
> 
> whew. now what do you suggest?
> 
> 
>                                   \\//_
> 
> 
> Mike McCarty wrote:
> 
> 
>>On Tue, 24 Jul 2001, montgomery f. tidwell wrote:
>>
>>
>>
>>>Howdy,
>>>
>>>almost, the source would be from about 5V to 18V (or so).
>>>
>>>7.5V might be a bit too high (for a minimum input).
>>>
>>>
>>
>>The circuit itself has to have some "headroom" to operate. There are
>>low dropout regulators available. How much current do you need? How
>>tight regulation? If you don't need too tight regulation or too much
>>current, then just a Zener diode might do.
>>
>>Mike



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