Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the beam group. File : /Greybeard's...
beam@yahoogroups.com
Jan 1, 2007 6:42 pm
54828
... Looks like I poke at these about once a year over the Christmas break; this is a followup to my post from last year. I finished up one dice project from...
Wow...that is some good information. The math seems to bear out my observations which is good, but the cool thing is that once the 1F gets charged, it will...
Hi tk With two 1F caps in series, which gives you a combined cap of 0.5F @ 5V, and a 1381L (3.2V) trigger, the initial charging time with a solar cell...
I'm using the solar cell that comes with the old Solarbotics Solarpopper 4.2 kit but I do have other options. I have some of the new Russian-made cells...
... Didn't take me until next year after all! A pleasant afternoon at the bench produced good results. The 4510 (actually a Motorola 14510, same thing) has a...
... Hmm? Thought I'd posted a reply to this. Oh, well, I finished it up this afternoon. I won't give details in case the other post shows up. The new...
Hmmm... so the 0.5ma current I derived from your timing measurements is very low compared to the rated output current of the cell. Keep in mind that the rated...
You ask a very good question...I might be able to measure the current if I knew how. ;-) I have a basic analog Radio Shack multimeter...I'm not sure how to...
hi all 74HC14 is this the same or can it be usde in place of a 74AC14? I want to use it in a turbot first then a walker. will it work? thanks jabmechtech ...
Hi, I've got a question about the 1381 (u) IC. I've looked through the datasheet, but couln't find the maximum current it can handle. Right now I'm using it in...
Hello everyone! This gallery is dedicated to YOU robot builder !!! http://picasaweb.google.co.uk/robomaniac Inspire yourself from these creations! Don't forget...
Well your description of the dice project triggered the old grey cells into action which resulted in a 2 chip digital design which is nevertheless very beamish...
Hi all, Wilf wrote this neat step-by-step build guide for the p5v2 motor walker. At a certain point though, it says something about +PDC and - PDC. What...
Corrected some errors and added comments to my earlier description. Well your description of the dice project triggered the old grey cells into action which...
You should invest in a digital multimeter (<$20) which is far more sensitive than a basic needle type meter and which will avoid influencing the circuit you...
If used to drive a motor directly the 72AC14, which has much higher current compared to the 74HC14, is recommended. For micropower logic applications involving...
The rated short circuit output current derived from the volatge drop at lower currents is <1mA when high and <10ma when low. However when measured, the actual...
Thanks, that brings some clarity. One last question about the solar engine though. I'm using it to power the p5v2 circuit, would it be wise to stack a couple...
Yes, those are the +V and -V connections across the PDs. For some solar power applications these power connections to the PD bridge can be switched to reduce...
Cool...a coworker well versed in electronics and I went through this earlier today with his multimeter. We were getting 2.5 microamps under a bright halogen...
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