Alt-BEAM Archive

Message #12281



To: beam@sgiblab.sgi.com
From: Lydia Smith rpg_lydia@yahoo.com
Date: Tue, 21 Mar 2000 09:53:32 -0800 (PST)
Subject: [alt-beam] Muscle/Bio wire


Does any one know if you can use biowire instead of
motors for walking 'bots?

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12282 Tue, 21 Mar 2000 09:56:18 -0800 [alt-beam] Re: LED blinker thingy "'beam@sgiblab.sgi.com'" Wilf Rigter

Hey Steve,

Since LEDs require a minimum of 1.6V to barely turn on, using a single 1.5V
AA cell can be done but is a challenge. I don't want to steal your thunder
but give you a starting point, I recommend using a circuit like the attached
LED driver which you can hang from any pair of complementary HC outputs, as
shown here from the bicore outputs. Note that the tripler circuit itself
only requires the 2 caps and 2 resistors. The bicore part of the circuit
represents any oscillator which has a true and inverted output. The
components shown generate a brilliant flash about once every 2 seconds. For
higher frequencies decrease the 10K resistor value until the brightness no
longer increases. This LED driver effectively triples the available LED
voltage and works with a supply voltage down to less than 1V. In addition,
it shapes the LED current into a short high current pulse which is highly
visible and saves power. As our friend Steven Bolt has tirelessly pointed
out to us in the past, the power required to run a HC oscillator drops
dramatically at 1.5V and a single AA cell can probably run a bicore for a
year. Adjusting the size of the caps (10-100uf) changes the brightness and
total current but even the 100uf caps will probably run a LED blinker thingy
for a couple of months.

have fun

wilf

<>
> -----Original Message-----
> From: Bumper314@aol.com [SMTP:Bumper314@aol.com]
> Sent: Monday, March 20, 2000 8:41 PM
> To: beam@corp.sgi.com
> Subject: LED blinker thingy
>
> Hello,
> I'm working with a circuit that uses the 74XX14 and will blink an LED
> for
> 2 years off of a AA battery. I have been attempting to get it to run with
> wilfs charge all day run all night type circuit (SimD1 I believe), but
> unsuccesfuly. Does anyone want to work with me to get his circuit
> BEAMized.
> Think of having a bot that charges all day and can blink for 24
> hours...phew
>
> Steve



Attachment: LEDPUMPX3.gif

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