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Old 01-29-2011, 03:42 PM   #21
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Good god man...555s are like $0.50 or less at mouser.com. Talk about markup.
Radio hack is high but they are local. So we pay for instant gratification I support them when I can because they are the last place that has parts and pieces. You can buy a PWM kit for $7.99 that was what I bought for my PWM boil kettle control.


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Old 01-30-2011, 06:57 PM   #22
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Updated diagrams to be more accurate and less messy; added NPN option.


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Old 01-30-2011, 07:30 PM   #23
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rocketman, if I could trouble you for links to the actual products on mouser.com


R1 = resistor ?

sorry electronic noob here.

I can solder and follow directions well. its just that those electrical diagrams are way over my head.

-=jason=-
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Old 01-30-2011, 07:41 PM   #24
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Originally Posted by Flomaster View Post
rocketman, if I could trouble you for links to the actual products on mouser.com


R1 = resistor ?

sorry electronic noob here.

I can solder and follow directions well. its just that those electrical diagrams are way over my head.

-=jason=-
Yup. R = resistor, C = capacitor, Q = transistor. Be sure to read my notes immediately following the pictures.
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Old 01-30-2011, 11:24 PM   #25
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Here is a I2C controlled PWM gadget if you are into PWM control with a Arduino or other platform http://shop.moderndevice.com/product...bs-dimmer-plug. It looks like it should be able to drive SSR's as they draw about the same current as LED's do.
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Old 03-01-2012, 07:33 AM   #26
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Hi rocketman, great looking design, i'm planning to build one asap, but i wanted to ask about what would a suitable mosfet transistor be...
I can only get my hands on a IRF1405 which is rated for 55V/169A
I know it's way over spec, but will it work? Are there any drawbacks to using it?

Thanks
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Old 03-01-2012, 01:46 PM   #27
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Originally Posted by rocketman768 View Post
That's what I was talking about when I said resistor voltage division. Until you turn the pot up to about 1/3 or 1/2, the fan won't move. I hate that, because the lower end of the speed range is gone.
The problem with a potentiometer is at the lower end you have no torque. This causes the motor to stall under a slower spinning starter.
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Old 03-01-2012, 02:59 PM   #28
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Originally Posted by hexman View Post
Hi rocketman, great looking design, i'm planning to build one asap, but i wanted to ask about what would a suitable mosfet transistor be...
I can only get my hands on a IRF1405 which is rated for 55V/169A
I know it's way over spec, but will it work? Are there any drawbacks to using it?

Thanks
Should work perfectly well.
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Old 03-01-2012, 04:14 PM   #29
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Rocketman, I just came across your post just before I was going to pick up some components for making a stir plate. I like your design and want to give it a try, but just one question... What is the voltage for the power supply? 12VDC?

Thanks!!
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Old 03-01-2012, 04:41 PM   #30
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Originally Posted by phertwo View Post
Rocketman, I just came across your post just before I was going to pick up some components for making a stir plate. I like your design and want to give it a try, but just one question... What is the voltage for the power supply? 12VDC?

Thanks!!
Depends on your motor. The 555 usually accepts 5V-15V, so whatever in that range works best for your motor.


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