Hi everyone, I have a request for the secret masters. I'm trying to build what basically amounts to an IR based proximity detector. IR LEDs shining outwards, a...
Can you post a schematic of what you have so far, Ian. I imagine you want to trigger the motor and have it latch on for a certain amount of time. Is this...
Ian, you may be interested in this circuit from Wilf: http://tech.groups.yahoo.com/group/beam/files/wilf_nv/IRSYNCv3a.gif There is a discussion of the circuit...
hi. just posted a video of the 'dozer' photovore. I used a capcitor from a 'hotwheels' car. it is small and fast when fully charged, it kind of favors one...
I've been looking hard but I can't find any backwards diodes in this circuit, Wolf. However, the transistor in the motor driver section is shown as an...
Tom Gray wrote: You're right. Yikes! It's more like 90%. And all those pages are on my old (dead) computer. I've asked Dave at Solarbotics for help, but I just...
... CNRG ... Thank you. I'm having to rethink,redesign,and rebuild, to compensate for the heat. soft rubber tiers probably are not a good Idea. How well dose...
Hi BEAMers, so I'm hooked and happily sniffing solder fumes. I've been scavenging parts from old bits of dead computers :). I"ve got a number of chips that are...
Andrew Sackville-West
andrew@...
May 5, 2007 1:30 am
55774
... scavenging ... essentially ... unsuitable ... Hi. a little wile ago these IC's were talked about. Others know more, but hope this helps. ...
Hi Andrew, I believe the reason that the ALS and LS chips are no good for suspended bicore is because they lack internal input protection diodes, which are in...
I have no idea just what Ian wants 'cos he seems to have gone walkabout. But I've had a brief play with some transistors and have cobbled together this: ...
Hello all. I'v tried a few fled se's without much success, always seem to hang up with the whining noise apparent. I'v tried various resistors with the same...
Have you tried putting “shrink tubing” over the flashing LED? FLEDs are very temperamental. PhilM ... __________________________________________________ Do...
... I'm from Scotland also, and i generally just use maplins, rapid electronics, ebeamuk and i have used total robots once. I'll maybe get some from there....
... [...] ... [...] ... thanks for the link. just to repeat, the 74als240 works as a grounded bi-core, though it seems a bit finicky about the cap/resistor ...
Andrew Sackville-West
andrew@...
May 5, 2007 6:51 pm
55782
My local store is aberdeen, takes me a while to manage to get enough time away from work to pop in by. Usually when i do they dont carry the component in stock...
I found a very interesting circuit on the internet recently, called the forever flasher, it seems to be excellent for beam. The idea is that it picks up radio...
... I'm down the way from you in sunny Kilmarnock. The nearest maplins to me is glasgow and can be a hit or a miss for stuff so i generally just use the web....
You could perhaps try ditching the FLED and using a resistor in its place. If your PNP's base resistor is 10k, then a 27k in place of the FLED would give an...
Microchip make the TC54, which is a CMOS voltage detector: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010716 ...
hi, As I continue to scavenge old chips from defunct computer parts, I run across all kinds of interesting stuff. My electronics knowledge is fledgling at...
Andrew Sackville-West
andrew@...
May 7, 2007 6:13 pm
55790
Check this related post. http://groups.yahoo.com/group/beam/message/55530 However, there are big advantages to using 74HC or 74AC parts which are also...
... right. thanks. ... indeed. And that is my situation. I never throw away old tech crap, despite the piles of it that are accumulating around me. The result...
Andrew Sackville-West
andrew@...
May 7, 2007 11:26 pm
55792
Hi. What is the difeance/advantage/disadvantige(if any) between a Black photodiode and a clear one? I've looked up photoresistors, LRDs,CDS, and the like and...
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