Search found 167 matches

by zotdoc
Thu Oct 30, 2014 12:36 pm
Forum: General Discussion
Topic: wheelcair power supply
Replies: 9
Views: 1377

Re: wheelcair power supply

after looking all over the net I cant find a transformer anywhere that will handle this problem, and the idea of just keeping the batteries charged looks better and better. Thanks guys.
by zotdoc
Thu Oct 30, 2014 8:58 am
Forum: General Discussion
Topic: wheelcair power supply
Replies: 9
Views: 1377

Re: wheelcair power supply

thanks for the input. I have a 240 volt 50 amp circuit for a welding machine and anyone have any ideas about where toget a 240 to 24 volt transformer that will handle this much current?
by zotdoc
Tue Oct 28, 2014 1:53 pm
Forum: General Discussion
Topic: Rare earth magnet and a 9 volt battery
Replies: 14
Views: 3350

Re: Rare earth magnet and a 9 volt battery

interesting film of an emp attack, anyone know how to protect a car from this scenario?
by zotdoc
Tue Oct 28, 2014 1:00 pm
Forum: General Discussion
Topic: wheelcair power supply
Replies: 9
Views: 1377

wheelcair power supply

I am working on a power chair robotics project and want to make a plug in power supply that would run 2 - 24 volt wheelchair motors as a test bed - so I can stop charging batteries all the time. The main circuit breaker in the power chair is 80 amps. does that mean I can get by with a 24 volt 80 amp...
by zotdoc
Tue Jan 11, 2011 1:46 pm
Forum: General Discussion
Topic: which microcontroller
Replies: 1
Views: 776

which microcontroller

Anyone care to expound on the relative merits of pic microcontrollers vs atmega arduino series? I have a fair amount invested in $$ and time on pics, my friend is an arduino fan. I just want some ammunition when he gets in a huff about arduino's vs pics. Thanks
by zotdoc
Tue Aug 04, 2009 11:59 am
Forum: Robotics
Topic: electric wheelchair
Replies: 4
Views: 2071

Re: electric wheelchair

Some of these wheelchairs have a seperate H Bridge unit, some have everything built into the joystick housing. If you have a seperate H bridge, you could use a PIC microcontroller to control it with PWM inputs. Perhaps you could make some sort of Segway like people mover, but most of these chairs wi...
by zotdoc
Mon Jul 27, 2009 7:18 am
Forum: General Discussion
Topic: Modern microelectronic marvels
Replies: 6
Views: 1223

Re: Modern microelectronic marvels

The nicotene is still dngerous in terms of heart and peripheral vascular disease, but it may be an aid to quit smoking. At least if this catches on, we non smokers won't have to put up with the smoke .
by zotdoc
Tue Jul 14, 2009 12:43 pm
Forum: General Discussion
Topic: Liquidating My Electronics Hobby
Replies: 25
Views: 3174

Re: Liquidating My Electronics Hobby

Maybe you could package it up as "starter electronic kits" to sell on ebay, throw in a few circuit ideas/schematics. People would probably buy it. I would sell the books seperately or in small groups.
by zotdoc
Tue Jun 30, 2009 8:25 am
Forum: General Discussion
Topic: motor starter capacitor
Replies: 4
Views: 1052

Re: motor starter capacitor

I would have liked to replace the motor with a 220 volt, but I don't want to spend the extra $$'s. I don't know what the usual capacitance ratings for motor starters are, but the one on the motor was a 400 uF. I bought one rated from 360-408 uF at a local electric supply store and the motor started ...
by zotdoc
Thu Jun 25, 2009 10:59 am
Forum: General Discussion
Topic: Close packing of relays
Replies: 5
Views: 942

Re: Close packing of relays

I made a matrix of 12 volt auto relays 12 by 12 relays glued together side by side and hand wired for a fireworks control board. We fired the fireworks with a small coil of nichrome wire using 2 12 volt auto batteries in series. It was enough current to destroy the nichrome coils for each firework f...
by zotdoc
Tue Jun 23, 2009 5:54 am
Forum: General Discussion
Topic: motor starter capacitor
Replies: 4
Views: 1052

motor starter capacitor

I have a 2 hp 1 phase 125vac motor for a dust collector, and it has a 125 vac 400 uF capacitor as a motor starter. Are motor start capacitors polarized? I want to hook this motor up and use it but the two wires are both black, so does it matter which wire is hooked to + or -?
by zotdoc
Wed Dec 10, 2008 7:20 am
Forum: General Discussion
Topic: x 10 switch
Replies: 3
Views: 941

x 10 switch

Is there anyone who can explain why an x-10 switch will not work with flourescent bulbs?
by zotdoc
Tue Oct 21, 2008 10:27 am
Forum: General Discussion
Topic: Cutting clean holes in enclosures
Replies: 25
Views: 4128

cutouts

I've used the decal technique to use as a guide when cutting out aluminum panels. They work well but if you are using a an electric jigsaw you have to be careful or the plate of the saw will rub the decal off!
by zotdoc
Tue Aug 26, 2008 12:48 pm
Forum: Robotics
Topic: mosfet h bridge questiion
Replies: 2
Views: 2465

driver chip

I found these half bridge drivers that should work, IRS2003. I'll try to let everybody know if they work out.
by zotdoc
Mon Aug 25, 2008 6:46 am
Forum: Up For Grabs
Topic: Robotic arm ( professional / commercial unit )
Replies: 5
Views: 3374

Hi, can you post more pics of the actual arm and put a yardstick or ruler in the picture for scale?