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Old 10-03-2012, 07:12 AM   #21
maltbarleyhops
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st charles mo, mo
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would this PWM work?

http://www.ebay.com/itm/12V-24V-3A-D...item4d0572cff8
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Old 10-03-2012, 07:10 PM   #22
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Originally Posted by maltbarleyhops View Post
Sure. The only problem I see is that they don't list the frequency and they may not include schematics. PWMs for DC motors are usually higher frequency so you don't notice the cycling of power. We need low frequency because most SSRs I've seen on ebay have a 20ms response time. If you got that one and figured out where C1 is you could play with different values until you got the desired frequency. I would post oscilloscope screenshots but I can't figure out how to get the stupid thing to save them to my thumb drive.

Would you be interested in buying pre-modified bakatronics PWMs? The caps are cheap and shipping should be relatively cheap, I would do $20 each shipped.

Reason: Forgot to mention shipping.

 
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Old 10-04-2012, 05:03 AM   #23
maltbarleyhops
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st charles mo, mo
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i bought 2 like the one from bakatronics (fk804) locally today. i have the 2.2 caps to modify them with. was it C1 or C2 that gets replaced?
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Old 10-05-2012, 04:08 PM   #24
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It is C1. If you are looking at the board and have the pot towards you C1 is the cap closest to you. As long as you didn't buy tantalum caps the orientation of the cap won't matter.

Reason: clarification

 
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Old 10-05-2012, 05:34 PM   #25
maltbarleyhops
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roger that.
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Old 11-14-2012, 05:06 PM   #26
maltbarleyhops
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st charles mo, mo
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finished the 120v ebrewer. wanted to post a pic. how does that work? it asks me for a URL.
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Old 11-14-2012, 05:12 PM   #27
maltbarleyhops
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st charles mo, mo
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and as soon as hong kong snailmail catches up to me ill be replacing the PWM with a PID and thermocouple.

this little rig is going to be a "template" for my original project of a 240v keggle based ebrewer system.

but i gotta tell ya, i like this mini biab recirculating rig i built. 3 gallon batch day in 5 hrs complete and a new beer every week.

and what im really liking about electric, everything done indoors in my little brewery.
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Old 11-14-2012, 09:44 PM   #28
rockinmarty
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click on attachment
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Old 11-15-2012, 07:52 AM   #29
maltbarleyhops
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finished the 120v ebrewer. wanted to post a pic. how does that work? it asks me for a URL.
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