rs14smith
Member
When both MOSFETs Q3 and Q4 are OFF, then resistors R1 and R2 pull up their drain terminals to 11V (12V). That's how they turn Q1 and Q2 OFF (by setting the Gates of Q1 and Q2 equal to their Source terminals.)
A voltage is different from a current. For a current to flow (e.g. through the motor) the voltages must be different. One end of the motor would be about 12V while the other is about 0V. If both ends of the motor are at about the same voltage, there is no current; the motor receives no power.
The way your meters are hooked up is nice for troubleshooting, but if you really want to understand what the motor sees hook both ends of a meter to both ends of the motor. The motor doesn't know what "ground" is. It's a notation for our convenience as it gives us a reference point. And simulators are homeless without a "0V" to return to.
Ah okay, I think I understand now. I'll have to re-look over left side with the IC's and resistors to fully understand wha'ts going on there. You explained that well, I just need to sit down and really study that side lol.
Time To Build The Hardware:
Do you by chance know of any online/local electrical stores near TN where I can order these components as I'm sure RadioShack doesn't have everything I need, and I usually order from Jameco, but they are located in California? I'm just looking to start building this on the breadboard as soon as possible since I'm on spring break at the moment