rkhanso
Well-Known Member
- Joined
- Jan 24, 2017
- Messages
- 774
- Reaction score
- 174
I've copied @Magialisk directions for a dual stir-plate using a 556 timer. I'm having trouble and can't figure out what the problem is. (I do realize that @Magialisk did mis-number the right side pins (8-14) on the diagram.
The link is here:
https://www.homebrewtalk.com/forum/threads/simple-pwm-stirplate-controller.219121/#post-4393542
So far, I've only tried 1 side of the timer for a single stir plate - built on a small breadboard. The speed seems whacky. Here's a video of the fan while I'm adjusting the Pot. I have to start with the Pot all the way to one side or the fan won't start turning. Then, I'm turning the pot the other way and it suddenly jumps up in speed to max. Then as I continue to keep adjusting the Pot, the speed slows down to a certain speed (still pretty fast) and then falls off completely and stops, while there's still a lot of travel (about half) left in the Pot.
Link to the video is HERE
Any ideas? Might I have put it together incorrectly? It sort-of works, so I would guess it's correct. Might I have a bad component? Has anyone else tried @Magialisk design and had it work OK?
Or, should I try to copy a different DIY PWM controller for a stir plate?
The link is here:
https://www.homebrewtalk.com/forum/threads/simple-pwm-stirplate-controller.219121/#post-4393542
So far, I've only tried 1 side of the timer for a single stir plate - built on a small breadboard. The speed seems whacky. Here's a video of the fan while I'm adjusting the Pot. I have to start with the Pot all the way to one side or the fan won't start turning. Then, I'm turning the pot the other way and it suddenly jumps up in speed to max. Then as I continue to keep adjusting the Pot, the speed slows down to a certain speed (still pretty fast) and then falls off completely and stops, while there's still a lot of travel (about half) left in the Pot.
Link to the video is HERE
Any ideas? Might I have put it together incorrectly? It sort-of works, so I would guess it's correct. Might I have a bad component? Has anyone else tried @Magialisk design and had it work OK?
Or, should I try to copy a different DIY PWM controller for a stir plate?
Last edited:
