Search found 35 matches

by camino75080
Tue Feb 22, 2005 7:15 pm
Forum: General Discussion
Topic: PWM help needed
Replies: 18
Views: 4072

Re: PWM help needed

Wow, you guys rock!<p>Chris, by brake a mean when the signal from the reciever is less than 1.5 ms brake means that a transistor will short across the motor with PWM and at 1 ms, the motor should get no power or braking.<p>Dr. when, I will look into the assembaly language. thanks for the idea.<p>Eng...
by camino75080
Mon Feb 21, 2005 10:05 pm
Forum: General Discussion
Topic: PWM help needed
Replies: 18
Views: 4072

Re: PWM help needed

Okay it seems that you guys need more info, I' not trying to drive a servo. What I am trying to drive is a DC motor, when the signal from the radio is 1 ms, I need full brake, at 1.5 ms neutral and at 2 ms full power. Here is why I need PWM, the motor can pull 30 amps when running and over 400 amps ...
by camino75080
Mon Feb 21, 2005 5:52 pm
Forum: General Discussion
Topic: PWM help needed
Replies: 18
Views: 4072

Re: PWM help needed

The system is a Futaba system. If the your idea with amplifing the signal could work, please explain it to me.
by camino75080
Mon Feb 21, 2005 4:09 pm
Forum: General Discussion
Topic: PWM help needed
Replies: 18
Views: 4072

Re: PWM help needed

Well guys, I thank you all for the help so far and have some questions:<p>1: Dr. When, you spoke of a free language for programming PICs, where can I get it and how hard is it?<p>2: Yall spoke of using a 555, I could try that, since it wouldn't cost too much, but how would I convert the signal from ...
by camino75080
Sun Feb 20, 2005 8:09 pm
Forum: General Discussion
Topic: PWM help needed
Replies: 18
Views: 4072

PWM help needed

Hello all, I am in the process of designing a speed controller for a RC hobby car. I need to drive the motor with at least a 20 KHz PWM signal but have no idea how to start. The signal from the radio is the same signal used to drive a servo (1ms for full brake, 1.5ms for neutral, 2ms for full power)...
by camino75080
Fri Feb 04, 2005 9:08 pm
Forum: General Discussion
Topic: Amazing soldering tool
Replies: 28
Views: 6949

Re: Amazing soldering tool

I bought one to test it, its OK but the tip gets eaten up quickly. Also, your'e supposed to use Lithium batteries, but I used Alkilines it killed them in a matter of minutes. other than that it realy does work.
by camino75080
Tue Jan 11, 2005 2:25 pm
Forum: General Discussion
Topic: Ultrasonic Motor
Replies: 2
Views: 1013

Re: Ultrasonic Motor

Yes there would normaly be a hole in the disk.
by camino75080
Mon Jan 10, 2005 7:26 pm
Forum: General Discussion
Topic: Ultrasonic Motor
Replies: 2
Views: 1013

Ultrasonic Motor

I don't know if anyone on this forum has the January 2001 edition of Poptronics, but they had an article dealing with ultrasonic motors. I want to try and build one which seems sraight forward enough, so here's my problem; NASA has some info on thier website but it is vague at best and I need a cust...
by camino75080
Mon Sep 27, 2004 12:03 pm
Forum: General Discussion
Topic: Capacitive discharge
Replies: 25
Views: 5485

Re: Capacitive discharge

No, I don't. When i simulate an inverter that should produce in the range of about 220V, I get a few volts over the source.
by camino75080
Mon Sep 27, 2004 10:19 am
Forum: General Discussion
Topic: SLA battery charger
Replies: 8
Views: 1930

Re: SLA battery charger

Sealed Lead Acid, DUH. What was I thinking? Anyway yeah its a lot of current, but it makes the batteries discharge fast so the motors have better low-end power and the slower charges cause a slower discharge for longer races.
by camino75080
Sat Sep 25, 2004 8:42 pm
Forum: General Discussion
Topic: Capacitive discharge
Replies: 25
Views: 5485

Re: Capacitive discharge

I got it!!!!!!!!!!!!!
by camino75080
Sat Sep 25, 2004 8:33 pm
Forum: General Discussion
Topic: Capacitive discharge
Replies: 25
Views: 5485

Re: Capacitive discharge

Thanks Mr.Al, I'm using "B2 Spice A/D v4.2 Lite" becuase, it's free, but missing some parts :( . Hers what my code looks like: ************************ * B2 Spice Subcircuit ************************ * Pin # Pin Name * 4 P2 * 5 P1 * 2 S1 * 1 S2 .Subckt Transformer 4 5 2 1 <p>***** subcircuit definiti...
by camino75080
Sat Sep 25, 2004 8:28 pm
Forum: General Discussion
Topic: Ferrox Cube
Replies: 8
Views: 3978

Re: Ferrox Cube

Thank you for the help. Yes I am trying to find thier cores for power transformer use, based off of a simple saturable core inverter.
by camino75080
Fri Sep 24, 2004 9:47 pm
Forum: General Discussion
Topic: SLA battery charger
Replies: 8
Views: 1930

Re: SLA battery charger

What is an SLA battery? Anyway, in that R/C car hobby, we normaly charge our 2.4AH nicads at anywhere from .5A to about 5A. But, I dont know how it works in other applicatons. Just my two cents.
by camino75080
Fri Sep 24, 2004 10:36 am
Forum: General Discussion
Topic: Capacitive discharge
Replies: 25
Views: 5485

Re: Capacitive discharge

ikay, I tried the method with mutal inductors, which worked, but with limited success. The simulation would run for about 120ns and say "convegence problems at node (x)". Not knowing what that means, I rearranged the circut w/o saving and couldn't duplicate my results. So, where do I enter the code,...