Search found 106 matches

by ecerfoglio
Thu Oct 27, 2005 5:54 pm
Forum: General Discussion
Topic: DIP Analog Switch source
Replies: 15
Views: 2669

Re: DIP Analog Switch source

All of the "plain old vanilla" CMOS (4051, 4052, and 4053, 4016 or 4066) analog switches have a very low "on" resistance and a high "off" resistance. Look up the actual values in the data sheets, but remember that they depend on the (+V) voltage used. "Ron" will be higher if you use +V = 5 V than if...
by ecerfoglio
Tue Oct 25, 2005 6:08 am
Forum: General Discussion
Topic: DIY Punk Ethic and Culture
Replies: 15
Views: 2748

Re: DIY Punk Ethic and Culture

In spanish one "billón" is 10E12. (one american Trillon)<p>Of course, it was impossible to translate any text that included the world billion. :roll: :roll:
by ecerfoglio
Mon Oct 24, 2005 1:32 pm
Forum: General Discussion
Topic: 12v on Pic input
Replies: 24
Views: 4972

Re: 12v on Pic input

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> I have the project completed. I ended up using a 2n2222 instead of an optoisolator. It works great, but it does have one odd characteristic: The switch is now *very* sensitive. <hr></blockquote><p>You may add a resist...
by ecerfoglio
Fri Oct 21, 2005 4:03 pm
Forum: General Discussion
Topic: 12v on Pic input
Replies: 24
Views: 4972

Re: 12v on Pic input

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> Originally posted by Gorgon: If you move the PIC input to the top of R2, its the correct decoding of what I wrote. R1 = 6.8 - 10k is ok, and R2 = 22 - 47k should be ok. Use a 1W zener and you can drop loads of overvol...
by ecerfoglio
Mon Oct 17, 2005 5:32 am
Forum: General Discussion
Topic: Paper Thin TV Screens
Replies: 5
Views: 905

Re: Paper Thin TV Screens

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> I wonder if it maintains its last state when it loses power. "yeah, I had front row seats to rolling stones, here's the ticket... Yeah, I know it looks like just a blank piece of paper, but really, it used to say row ...
by ecerfoglio
Fri Oct 07, 2005 1:22 pm
Forum: General Discussion
Topic: AC line / UPS power switch
Replies: 15
Views: 2639

Re: AC line / UPS power switch

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> Paul A posted: It is important to be sure that the cords are not plugged in backwards (hot to neutral and neutral to hot) as that would make a short circuit at the point where the neutrals were spliced and this is the...
by ecerfoglio
Thu Oct 06, 2005 6:07 am
Forum: General Discussion
Topic: Digital display in fuel meters for cars
Replies: 16
Views: 3306

Re: Digital display in fuel meters for cars

Yes, I remember those digital dashboard modules.<p>They used RCA's 3161/3162 chips. Not a very good choice for A/D converters and display drivers (A/D = analog/digital). <p>Hard to find, easy to destroy accidentally and sort of impossible to get a reading of 0.000 with cero input.<p>If you want to m...
by ecerfoglio
Fri Sep 30, 2005 4:04 pm
Forum: General Discussion
Topic: Digital display in fuel meters for cars
Replies: 16
Views: 3306

Re: Digital display in fuel meters for cars

When you are driving you must do just that: ** drive ** .<p>If you want to drive safely, You have only a little "processing power" left (in your brains :) ) to attend to a digital gauge. <p>Not only does an analog gauge give you an aproximate idea of the fuel left in your tank, you also have a warni...
by ecerfoglio
Tue Sep 27, 2005 2:14 pm
Forum: General Discussion
Topic: Digital display in fuel meters for cars
Replies: 16
Views: 3306

Re: Digital display in fuel meters for cars

It’s not easy to read a digital display in a car’s dashboard while you are driving. With an analog gauge it’s easier to get at a glance a rough idea of the amount of fuel left in the tank.<p>(An analog gauge may be a “real” needle or a bargraph, either a led array or an lcd)<p>As the tank has not a ...
by ecerfoglio
Fri Sep 16, 2005 4:32 pm
Forum: General Discussion
Topic: A very newbish question about non-plarized caps
Replies: 16
Views: 3040

Re: A very newbish question about non-plarized caps

There was a very good thread earlier this year on this forum about capacitors markings, including an exelent post by Dean Huster.<p>You can find it Here<p>regards<p>[ September 16, 2005: Message edited by: ecerfoglio ]</p>
by ecerfoglio
Tue Sep 13, 2005 5:39 am
Forum: General Discussion
Topic: where does the power go?
Replies: 80
Views: 15929

Re: where does the power go?

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> "Reality check," we called it, .....<p>This quick and dirty mental computation was a skill which was very valuable then, and is still valuable, in my opinion. <hr></blockquote><p>Even in this times of calculators, com...
by ecerfoglio
Wed Jul 20, 2005 10:53 am
Forum: General Discussion
Topic: Super Beetle Voltage Regulator Question
Replies: 8
Views: 4176

Re: Super Beetle Voltage Regulator Question

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> You say it’s a alternator, and You have a Regulator? How big is the regulator?<p>BIG black box or a small aluminum heat sink? <p>Alternators used solid state regulation .... <hr></blockquote><p>Once upon a time (mid 6...
by ecerfoglio
Wed Jul 13, 2005 3:24 pm
Forum: General Discussion
Topic: ULN2803A Darlington array - GRR
Replies: 11
Views: 2026

Re: ULN2803A Darlington array - GRR

When its input is high (~5 volts), each driver inside the ULN 2803 will sink current from its output - in other words, it will connect its output to ground (pin 9).<p>When its input is low (~ 0 volts), its output will simply act as an "open circuit". It cannot "source" current to its load. (The conn...
by ecerfoglio
Thu Jul 07, 2005 3:15 pm
Forum: General Discussion
Topic: Servo Control with Microcontroller
Replies: 7
Views: 1328

Re: Servo Control with Microcontroller

If the grounds are not tied together the servo does not "see" the pulse, so it moves to the end of its travel.<p>The servo must be connected to the battery (6V suply) (+ to the red wire, - to the black one), and to the microprocesor (output to the yellow wire, ground to the black wire).
by ecerfoglio
Thu Jul 07, 2005 11:18 am
Forum: General Discussion
Topic: Servo Control with Microcontroller
Replies: 7
Views: 1328

Re: Servo Control with Microcontroller

Are the grounds of the tho power supplies (5 V for the microcontroler, 6 V for the servo) tied together??