Final version

165

02:15:00

This is the final version of the motor control.  This version has the best voltage spread and the transistors can all be PNP power transistors. I used 2n3055 for this application.

The bottom potentiometer is used to set the center point, the two resistors were replaced with CDS cells. This might be used for many things where you want to control the direction of a motor with respect to another value. 

I have bread boarded this and it works.  When the CDS cells receive equal light the circuit is balanced, when one is shaded the circuit is unbalanced and polarity is shifted either positive our reversed.  

You will not get positive and negative, rather positive and less positive.

published 12 years ago

hamilton1300

12 years ago

Any thought on this project would be welcomed.

Sine_eyed

12 years ago

I like the concept, and the functionality. I know we're limited somewhat by the available workspace, but it's almost rare here for someone to post a complete and usable real world circuit. If I were keeping score, megabonus points would always be rewarded to those circuits that anyone with a little know how could follow that schematic and layout part for part a real, working version at home. Moreover, with the greater majority of users here being novice level, additional points awarded if you don't have to be lieutenant-commander Geordi LaForge to understand! So, great job hamilton, IF I was keeping score you'd have a bunch of points coming your way.. X^)

faceblast

12 years ago

2N3055 is NPN not PNP and doesn't fit into a breadboard, it's TO3

hamilton1300

12 years ago

Sorry about the typo @faceblast, 2n3055 also available in a to220

Sine_eyed

12 years ago

Yep that's true- I picked up a couple from radio shack just the other day..

hamilton1300

12 years ago

@sine_eyed, I'm looking for a source for hall effect transistors. I'm thinking about using them for a magnetic version of this. Any thoughts?

Sine_eyed

12 years ago

I've always been on the lookout for those too. I finally spotted a few taking apart an old floppy disk drive, but they're smd and I haven't messed with them yet. Sorry I don't know the make or model of the drive, or remember which old computer it came out of- but that's where I would start..

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.