PWM..Show us How - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Electric Brewing > PWM..Show us How

Reply
 
Thread Tools
Old 01-29-2011, 01:15 AM   #1
Double-R
Recipes 
 
Mar 2010
Newburgh,NY
Posts: 316
Liked 10 Times on 9 Posts



Been looking an waiting, Pretty sure i'm not the only one wondering,[LEFT]how do you build/make one. Some say get a PWM , you dont need a PID setup . SO I ask . HOW..

 
Reply With Quote
Old 01-29-2011, 06:20 AM   #2
wyzazz
Recipes 
 
Aug 2009
Atwater, OH
Posts: 4,312
Liked 55 Times on 52 Posts


http://home.highertech.net/~cdp/boilnew/boilnew.htm
__________________
Quote:
Originally Posted by Revvy View Post
And I'd like to see my 1.080 beers ready from grain to glass in a week, and served to me by red-headed twin penthouse pets wearing garter belts and fishnet stockings, with Irish accents, calling me "master luv gun," but we can't always get what we want can we? :)

 
Reply With Quote
Old 01-29-2011, 03:14 PM   #3
freddyb
 
freddyb's Avatar
Recipes 
 
Apr 2008
Posts: 184
Liked 7 Times on 7 Posts


Buy this: http://www.bakatronics.com/shop/item.aspx?itemid=383
Replace C1 with a 2.2uF capacitor to lower the frequency.
Use a 12V wall wart as a power supply to the PWM board.
Connect the output of the PWM board to a SSR to control your boil.

This is how I did it and I'm very happy. Cheap, easy, responsive control.

maltbarleyhops Likes This 
Reply With Quote
Old 01-29-2011, 03:57 PM   #4
wyzazz
Recipes 
 
Aug 2009
Atwater, OH
Posts: 4,312
Liked 55 Times on 52 Posts


Interesting! Very Nice!
__________________
Quote:
Originally Posted by Revvy View Post
And I'd like to see my 1.080 beers ready from grain to glass in a week, and served to me by red-headed twin penthouse pets wearing garter belts and fishnet stockings, with Irish accents, calling me "master luv gun," but we can't always get what we want can we? :)

 
Reply With Quote
Old 05-06-2011, 05:03 PM   #5
SpottedDogBrewing
Hmmm, BEER!
HBT_LIFETIMESUPPORTER.png
 
SpottedDogBrewing's Avatar
Recipes 
 
Apr 2008
Goodells, MICHIGAN
Posts: 1,463
Liked 53 Times on 47 Posts


Quote:
Originally Posted by freddyb View Post
Buy this: http://www.bakatronics.com/shop/item.aspx?itemid=383
Replace C1 with a 2.2uF capacitor to lower the frequency.
Use a 12V wall wart as a power supply to the PWM board.
Connect the output of the PWM board to a SSR to control your boil.

This is how I did it and I'm very happy. Cheap, easy, responsive control.
Can you show photo's of your unit with the wiring schematic
__________________
Spotted Dog Brewing


"This is grain, which any fool can eat, but for which the Lord intended a more divine means of consumption.. Beer!"
-Robin Hood, Prince of Thieves, Friar Tuck

"The nations of the West also have their own intoxicant, made from grain soaked in water...Alas, what wonderful ingenuity vice possesses! A method has actually been discovered for making even water intoxicated."
- Pliny the Elder

 
Reply With Quote
Old 05-06-2011, 05:35 PM   #6
freddyb
 
freddyb's Avatar
Recipes 
 
Apr 2008
Posts: 184
Liked 7 Times on 7 Posts


Quote:
Originally Posted by SpottedDogBrewing View Post
Can you show photo's of your unit with the wiring schematic
Here's a diagram I made. I tried to keep it simple. Hopefully it's enough to get you going. It's easier to understand once you get your hands on this stuff and start piecing it together.


bendiy Likes This 
Reply With Quote
Old 05-06-2011, 05:48 PM   #7
Homercidal
Licensed Sensual Massage Therapist.
HBT_MODERATOR.png
 
Homercidal's Avatar
Recipes 
 
Feb 2008
Reed City, MI
Posts: 30,913
Liked 4857 Times on 3273 Posts


I have one of those PWM boards and it was very easy to build. I connected to a 12V and watched it smoothly run from Zero to full speed through the whole range of the dial.

Adjusting for a heater element is extremely easy.

Once the board is built, and you have your 12V connected, simply run the output to a Solid State Relay, and connect the Relay to the heater element.

The PWM controller turns the relay on and off faster for more heat, and slower for less. Think of it as controlling PULSES of electricity to the element. The faster the pulses come, the hotter the element will get.

 
Reply With Quote
Old 05-06-2011, 06:00 PM   #8
Inodoro_Pereyra
Recipes 
 
Feb 2011
Miami, Florida
Posts: 868
Liked 12 Times on 12 Posts


Quote:
Originally Posted by Homercidal View Post
The PWM controller turns the relay on and off faster for more heat, and slower for less. Think of it as controlling PULSES of electricity to the element. The faster the pulses come, the hotter the element will get.

Hmmm...no. A real PWM controls the heat by varying the time the element is active, in relation with the total pulse time. The pulse frequency never changes. What changes is the part of the total pulse the element is receiving power. The wider the active part of the pulse, the more heat produced (hence the "pulse width modulation" name).
__________________
A pessimist is a well informed optimist.

 
Reply With Quote
Old 05-06-2011, 06:07 PM   #9
wyzazz
Recipes 
 
Aug 2009
Atwater, OH
Posts: 4,312
Liked 55 Times on 52 Posts


^^What he said^^

The PWM doesn't modify the amount of heat the element puts out, that is static based on the wattage/voltage. It just modifies the amount of time the element stays on.
__________________
Quote:
Originally Posted by Revvy View Post
And I'd like to see my 1.080 beers ready from grain to glass in a week, and served to me by red-headed twin penthouse pets wearing garter belts and fishnet stockings, with Irish accents, calling me "master luv gun," but we can't always get what we want can we? :)

 
Reply With Quote
Old 05-06-2011, 07:23 PM   #10
Homercidal
Licensed Sensual Massage Therapist.
HBT_MODERATOR.png
 
Homercidal's Avatar
Recipes 
 
Feb 2008
Reed City, MI
Posts: 30,913
Liked 4857 Times on 3273 Posts


Yeah, now that I re-read my post I have no idea why I posted it like that. I guess that's what happens when you are trying to install Exchange Server and figure Mash Adjustments while reading and posting on HBT...

The image above has a very good sample of the frequency showing the hotter vs the cooler pulse widths. It's more about the time per pulse that the element is on vs the time per pulse that it's off.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Show us your element housings/pots. How did you do it? Boerderij_Kabouter Electric Brewing 312 09-27-2015 12:20 AM
Show us your electric brewing rig shroomzofdoom Electric Brewing 167 10-12-2013 06:18 PM
Show me your cheap electrical enclosure Dgonza9 Electric Brewing 34 12-30-2011 04:39 PM
Show me your waterproof heatstick connections CoalCracker Electric Brewing 3 10-27-2010 08:42 PM


Forum Jump