Search found 15 matches

by JKMADSCI
Mon Feb 28, 2005 3:43 pm
Forum: General Discussion
Topic: Desoldering
Replies: 14
Views: 3151

Re: Desoldering

Ive had great results with the rs sucker. I like it because you dont waste any time inbetween heat
and suction. In an emergency i use caned air if all else fails.
by JKMADSCI
Mon Feb 28, 2005 3:37 pm
Forum: General Discussion
Topic: BasicStamp2
Replies: 10
Views: 3142

Re: BasicStamp2

I never bought the kit, but i think pics and stamps are awesome. If your a newby, the stamp is
a great way to get started.
by JKMADSCI
Fri Feb 25, 2005 6:16 am
Forum: General Discussion
Topic: LED Load Equalizer
Replies: 5
Views: 1469

Re: LED Load Equalizer

I think your situation depends on the flasher circuit. As we all know, in the old days a simple flasher can was used on most cars witched basically shut off every 1/2 second due to heat generated by current. Depending on your flasher controller your bike might not need a load to flash!
by JKMADSCI
Mon Feb 14, 2005 11:59 am
Forum: General Discussion
Topic: PICing it or How I learned to love Microcontrollers
Replies: 36
Views: 7228

Re: PICing it or How I learned to love Microcontrollers

Hey chris, i just read all these posts and came to one conclusion. You are an ---
by JKMADSCI
Wed Jan 26, 2005 3:57 am
Forum: General Discussion
Topic: 120VAC control from basic stamp?
Replies: 5
Views: 1802

Re: 120VAC control from basic stamp?

I think the max output of a basic stamp is about 30ma. Basically all you will need is a base resistor of about 1k feeding a 3904 npn transistor, and an ac relay that runs from 5 volts less than 150ma. If you find a solid state relay that draws less than 25ma you can connect it direct. Dont forget th...
by JKMADSCI
Sat Jan 22, 2005 5:17 pm
Forum: General Discussion
Topic: PICing it or How I learned to love Microcontrollers
Replies: 36
Views: 7228

Re: PICing it or How I learned to love Microcontrollers

And what would you use to control an lcd if no
pics were allowed?
by JKMADSCI
Sat Jan 15, 2005 5:12 am
Forum: General Discussion
Topic: atx power supply for hobby electronics
Replies: 10
Views: 2635

Re: atx power supply for hobby electronics

If you want your 12 volts rock solid, find the adjustment pot and feed in 12 volts with a 50k pot.
1. remove original pot
2.connect 12 volts to a 50 k pot to the pot trace
that goes towards the 494 controller.
3. most will adjust the 12 volt rail from 8 volts to 14 volts at 10 amps all day long.
by JKMADSCI
Fri Dec 31, 2004 2:36 pm
Forum: General Discussion
Topic: Any Assembler (for PIC) wizards out there?
Replies: 28
Views: 5340

Re: Any Assembler (for PIC) wizards out there?

I just spent 4 hours troubleshooting an intermittent lockup on a pic 16f684 because i forgot about how the current memory bank must be restored in the interupt routine. Does any one know why the pics cant be designed with ONE BANK of memory and ONE BANK of program space? Is it a money thing? Id pay ...
by JKMADSCI
Sun Dec 19, 2004 12:46 pm
Forum: General Discussion
Topic: What's everyone working on?
Replies: 52
Views: 22492

Re: What's everyone working on?

Im working on using a pic 16f684 as a generic control circuit. I have a board with an lcd,pic and an op amp. Using the 2 atd's on the pic i can control the pwm signal out for voltage or current control. Working with double bytes is so hard i cant speak to humans anymore.<p>Last year i used a bs2 to ...
by JKMADSCI
Wed Aug 25, 2004 1:24 pm
Forum: General Discussion
Topic: 12 volts into 24 volts
Replies: 3
Views: 1249

12 volts into 24 volts

Does any one have a schematic for a circuit that wouuld convert 12 volts dc into 24 volts dc.
I need 24 volts dc at 1.5 amps. The source voltage would be a car battery. I realise that this will require some type of switching ac circuit.
Thanx in advance
by JKMADSCI
Tue Aug 03, 2004 5:18 pm
Forum: General Discussion
Topic: 11.5Vdc / 12Vdc to 12.5Vdc/13Vdc
Replies: 16
Views: 3663

Re: 11.5Vdc / 12Vdc to 12.5Vdc/13Vdc

One way to add 1 to 2 volts would be to use a sub c 3000 nimh battery. This would be good for testing your theory on fuel proportional to voltage. We use these nimh batteries in rc cars and they perform well at constant current up to 20 amps. The only thing you have to watch for is running the batte...
by JKMADSCI
Sun Jul 25, 2004 9:26 am
Forum: General Discussion
Topic: dtmf
Replies: 9
Views: 2221

Re: dtmf

Hey cato i sent you a private message with more data. let me know if you got it?
[email protected]. Im new to this bb.
by JKMADSCI
Fri Jul 23, 2004 1:19 pm
Forum: General Discussion
Topic: dtmf
Replies: 9
Views: 2221

Re: dtmf

I appreciate the responses, but my personal requirements are 1. no external filters 2. no external ic 3. ive looked at that fourier program and it is too complicated and way too long for my taste. Ive wrote software in q basic to replicate the waves and using a simple peak counting algorithim ive co...
by JKMADSCI
Thu Jul 22, 2004 9:18 pm
Forum: General Discussion
Topic: A HVAC THERMOSTAT USING A PIC
Replies: 12
Views: 2364

Re: A HVAC THERMOSTAT USING A PIC

I recently had great luck using a commercial thermostat to power a large relay. I used the relay to power on and off my large AC(28000 btu).
i purchased the relay on line (30 amps 240 volts)
The relay has a 5 volt coil powered by a wall adapter, through the thermostat.
by JKMADSCI
Thu Jul 22, 2004 8:59 pm
Forum: General Discussion
Topic: dtmf
Replies: 9
Views: 2221

dtmf

i am trying to decode dtmf signals using only a pic 16f684 and no other ic. Im able to decode what column the key was pressed in by counting th frequency.If anyone knows of some code (short)
to decode what row the key is in i would greatly appreciate the help