Search found 1555 matches

by dyarker
Fri Dec 05, 2003 7:18 pm
Forum: Robotics
Topic: IS, WAS and maybe
Replies: 4
Views: 2190

Re: IS, WAS and maybe

A politcal MAYBE gate doesn't listen to inputs :D
by dyarker
Fri Dec 05, 2003 6:58 pm
Forum: General Discussion
Topic: Caps, availability, next generations?
Replies: 15
Views: 2559

Re: Caps, availability, next generations?

Yeah "MFD" is kinda wrong. Catalog writers aren't engineers. If you're getting picky, the "D" shouldn't be there either. It is something you learn to ignore because everyone understands it would take a very big truck to move a MegaFarad capacitor.<p>Lower case u for micro, is also a compromise becau...
by dyarker
Fri Dec 05, 2003 6:57 pm
Forum: General Discussion
Topic: Old post (circuit) problem
Replies: 13
Views: 2006

Re: Old post (circuit) problem

Does the dash board light that you tapped off still work? If the bulb is burned-out, your circuit is only "seeing" 0 Volts on input that is open or short depending brake position.<p>Or, the wire from the lamp to your circuit has worn insolation and is grounding somewhere.<p>Or, the transistor drivin...
by dyarker
Thu Dec 04, 2003 7:12 pm
Forum: General Discussion
Topic: Amps to watts
Replies: 13
Views: 2144

Re: Amps to watts

Power (in Watts) = E (voltage) times I (current in Amps)<p>C U L
by dyarker
Thu Dec 04, 2003 7:04 pm
Forum: General Discussion
Topic: power supply hangup
Replies: 6
Views: 1298

Re: power supply hangup

Hard to tell without schematic. Sounds like potentiameter wiper goes open when turned down HARD. Or if LM723 is in socket, one pin is dirty.<p>C U L
by dyarker
Fri Nov 28, 2003 10:47 pm
Forum: General Discussion
Topic: Stamp 2 Traffic Light
Replies: 11
Views: 2453

Re: Stamp 2 Traffic Light

Shing,<p>Since you're in Ireland, does that mean you want "drive-on-the-left-side" versus "drive-on-the-right-side"?<p>In either case some savings can be made. The red, ambers and greens for both directions in the cross of the tee can be parallel (straight through). Only one direction on the cross o...
by dyarker
Sat Nov 22, 2003 4:47 pm
Forum: General Discussion
Topic: Revitalizing electrolytic caps
Replies: 12
Views: 3030

Re: Revitalizing electrolytic caps

The process is called reforming. It is performed before plugging in a long unused piece of equipment to prevent internal arcing in the electrolytic caps.<p>Since you've already plugged-in the power supply, and the caps didn't blow (literaly) or smoke, there is no internal short. The caps are bad, re...
by dyarker
Thu Nov 20, 2003 7:38 pm
Forum: Computer Programming
Topic: Tackometer for 60 hz
Replies: 1
Views: 1446

Re: Tackometer for 60 hz

60Hz = 3600RPM, 59Hz = 3540RPM, etc (Hz = RPM/60)<p>If it is an analog tachometer (moving needle) you can make a new scale on paper and paste it on the old scale under the needle.<p>If it is a digital tachometer MAJOR surgery would be needed to change the display to Hz. Stick a label of equivilents ...
by dyarker
Wed Nov 19, 2003 7:22 pm
Forum: Computer Programming
Topic: can visual basic control serial or usb port power?
Replies: 14
Views: 7432

Re: can visual basic control serial or usb port power?

Yes. DTR pin to resistor (try 470 Ohms, 1/4W), other end of resistor to optoisolator LED's cathode, also to LED cathode connect a signal diode's anode, LED anode and signal diode cathode to RS-232 ground (pin 7 on 25 pin connectors, pin 5 ?? on 9 pin connectors).<p>Repeat for RTS.<p>The signal diode...
by dyarker
Tue Nov 18, 2003 6:32 pm
Forum: Computer Programming
Topic: can visual basic control serial or usb port power?
Replies: 14
Views: 7432

Re: can visual basic control serial or usb port power?

For USB, look in Nuts & Volts (probably in later half) for a company selling USB to parallel converter circuit boards. Put that circuit board in a plastic box with a buffer chip with your relay(s). Power it with a 9VDC or 12VDC wall wart and a regulator in the box. You can have 8 relays, or 4 inputs...
by dyarker
Mon Nov 17, 2003 5:11 pm
Forum: Computer Programming
Topic: can visual basic control serial or usb port power?
Replies: 14
Views: 7432

Re: can visual basic control serial or usb port power?

A ring0 DLL, that would be very useful. Thanx<p>mikea1962375,
I believe you're using Win XP, so you'll need the DLL referenced in the link in hp's second post to make a parallel port interface.<p>C U L-
by dyarker
Sun Nov 16, 2003 8:27 pm
Forum: Computer Programming
Topic: can visual basic control serial or usb port power?
Replies: 14
Views: 7432

Re: can visual basic control serial or usb port power?

No, you can't control power to serial or USB ports. hp's suggestion is better if you're using DOS, Win 3.x, Win 95, Win 98 or Win ME. It will NOT work for Win NT, Win 2000 or Win XP.<p>For two relays on any version of windows use the DTR (data terminal ready) and RTS (request to send) lines of the s...
by dyarker
Tue Nov 11, 2003 8:23 pm
Forum: Computer Programming
Topic: programming on a drum computer
Replies: 6
Views: 2672

Re: programming on a drum computer

Aahh, circa Klienschmit and model 15 teletypes, and vibrators to step up the voltage for tube type car radios.<p> :D ;) :p
by dyarker
Tue Nov 11, 2003 8:16 pm
Forum: Robotics
Topic: Least integer again.
Replies: 6
Views: 2716

Re: Least integer again.

Normally we don't see the flags register unless doing assembly programming. The OS takes care of it.
by dyarker
Tue Nov 11, 2003 4:59 am
Forum: Computer Programming
Topic: programming on a drum computer
Replies: 6
Views: 2672

Re: programming on a drum computer

And the amplifiers for the read heads and write heads were miniature vacuum tubes?<p>The first piece of equipment I was trained to fix used magnetic cores for logic. Ceramic toriods wraped with iron tape, four insulated windings. Enclosed in plastic about 1/2" square. Two together worked like a flip...