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DPRG: BOUNCE dprglist@dprg.org: Non-member submission from [Dave Hrynkiw <dave@solarbotics.com>]

Subject: DPRG: BOUNCE dprglist@dprg.org: Non-member submission from [Dave Hrynkiw <dave@solarbotics.com>]
From: Jim Brown jimbrown at airmail.net
Date: Sat Jan 24 21:12:36 CST 1998

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>Subject: BOUNCE dprglist at dprg.org:    Non-member submission from [Dave
Hrynkiw <dave at solarbotics.com>]   
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>Date: Sat, 24 Jan 1998 20:07:48 -0700
>To: Christopher Fairbairn <lgcl01 at es.co.nz>, DPRG <dprglist at dprg.org>,
>        seattle robotics society <srs at seattlerobotics.org>
>From: Dave Hrynkiw <dave at solarbotics.com>
>Subject: Re: Solar Power + Motor Control
>In-Reply-To: <199801250024.NAA01825 at Zeus.es.co.nz>
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>At 01:24 PM 1/25/98 +1300, Christopher Fairbairn wrote:
>>I'm sure this circuit has been seen by most of you sometime, but what I am
>>wondering is how much current would the motors be able to draw from it?
>>
>>Solar-Engine:
>
>It boils down to the limits of the capacitor and the power transistor
>(3904/2n2222). If you have a great whacking capacitor (0.33 Farad, etc),
>we've had no problems using the 3904 to drive about 150 ~ 300 mA. We've
>even done as high as about 600mA with AquaVores (propellors under load
>REALLY load up the motors) for about 40 second bursts just fine. We've
>never let "the magic smoke" out of one of these circuits before.
>
>>I am thinking of including it in a simple robot I am building but I'm
>>thinking I'll have to replace the present motors with motors which suck less
>>current from this circuit.
>
>That will definitely help, but larger capacitors will help immensely. I
>don't mean just 4700uF, I mean in the 0.33F, 1.5F, and 10F ranges. We've
>even got a few 100F 2.5V caps here to play with (but haven't used in a bot
>yet!).
>
>Regards,
>Dave
>--
>"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_.  Yes, 
>that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
>2 vowels. Pronounciation? _SMITH_". EMAIL:dave at solarbotics.com
>Solarbotics http://www.solarbotics.com
>
>
>
>
>
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