Search found 4 matches

by George Herzog
Tue Aug 09, 2005 8:10 am
Forum: General Discussion
Topic: DC from AC without transformer
Replies: 4
Views: 2166

Re: DC from AC without transformer

Without a transformer, this is known notoriously as unisolated DC. That means that if you happen to touch a wire, it may serious harm or kill you as your body may be grounded by whatever you are touching or standing upon.<p>again and again you will find Nuts and Volts recommending using a transforme...
by George Herzog
Sun May 01, 2005 8:20 am
Forum: Computer Programming
Topic: pocket programmer II
Replies: 2
Views: 2629

Re: pocket programmer II

I suspect that your software is DOS dependent and that your installation of WindowsXP has upgraded beyond DOS. <p>If so, you can never go back again.<p>The Disk Defragment Utiltity will tell you if you are using FAT32 or NTFS. If you have moved over to NTFS, you no longer operate with DOS. [For some...
by George Herzog
Sun May 01, 2005 8:02 am
Forum: Robotics
Topic: PWM controllers
Replies: 2
Views: 2946

Re: PWM controllers

You can build your own PWM control using a 555 chip that inputs a voltage level and outputs a modulated pulse dependent upon the input voltage. Look in the manufacturer's fact sheets for this application or just Goggle around.
by George Herzog
Sun May 01, 2005 8:00 am
Forum: Robotics
Topic: Robot Batteries
Replies: 3
Views: 3484

Re: Robot Batteries

Lead Gel Cells are the least problematic. Simple to charge, hold a charge for a long time, and easy to acquire.<p>Nickel Cadium or Nickel Hydride don't have as much power and have special charging requirements.<p>Lithium batterys have lots of power, but cost a lot and may even explode into a firebal...