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Old 23rd June 2013, 08:19 PM   #2021
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you could do something like this to make sure those fans always start properly...
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Old 23rd June 2013, 08:36 PM   #2022
Zen Mod is offline Zen Mod  Serbia
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or - if fan is connected via series resistor , put biggish elco across that resistor

even better - make parallel connection of resistor , biggish elco and appropriately sized zenner diode
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Old 23rd June 2013, 10:23 PM   #2023
evanc is offline evanc  United States
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how about this ...with temp. sensor.
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Old 23rd June 2013, 10:51 PM   #2024
bcmbob is offline bcmbob  United States
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The fan is really not that much of a problem. It starts just fine with a straight connection from the 7.5 VDC wall wart. As shown in the specs it's designed to operate over a range of voltages. Asus motherboards have a feature called "Cool & Quiet" that will start the fan low and increase the speed as the system temps get higher. I'm not sure how sophisticated that technology on the MB is.


The pump also lists a range from 5 to 12 volts, but 7.5 with the pot turned all the way up is necessary to get it rolling. The only problem with that is slower pump speed = more heat removal.

DC 12V 6W PUMP MOTOR (may need to open in new tab/window)

I spoke to a friend yesterday who said low voltage AC starts can function as long as the amps are full and stable. As Andrew said in his email, some form of pulse circuit is necessary to pull off the same trick with DC. (Man-that's another gold star for Mr.T )

I think this unit might be what's needed and is tiny compared to those found at Home Depot and the like.

DC Motor Speed Control Switch

What do you think?

EDIT: evanc, if that works it would be even sweeter !
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Last edited by bcmbob; 23rd June 2013 at 10:58 PM.
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Old 24th June 2013, 01:09 AM   #2025
evanc is offline evanc  United States
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I've made a few and they work fine. Good fine adjustment. Fan kicks on at a bit of a higher speed then needed and then slows to where it needs to settle.
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Old 24th June 2013, 01:12 AM   #2026
bcmbob is offline bcmbob  United States
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Great, I'll get one started.

Thanks
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Old 24th June 2013, 09:38 PM   #2027
12B4A is offline 12B4A  United States
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I'm looking for some creative input here and I think this might be the best place to post this since it will end up being my own F5 amp picture one day. I'll be building an F5 using the diyAudio chassis and I've been trying to come up with something interesting to do with the blank front panel. The idea that I have is sort of like how schematics used to be printed on the inside casing of radio equipment. I took the F5 schematic and removed the nomenclature etc. leaving just the circuit symbols. The F5 circuit is just simple enough to where this might not look too busy. It would be engraved on the front with the engraving painted black. Any thoughts for improvement? If something like this has been done before either with a DIY Pass amp or something else, then I'd like to see how it turned out.
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Old 24th June 2013, 09:58 PM   #2028
6L6 is offline 6L6  United States
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I think it's a great idea! Nice graphic as well.

The only thing I would change is to flip the schematic so the output is on top.
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Old 24th June 2013, 11:02 PM   #2029
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Quote:
Originally Posted by 12B4A View Post
Any thoughts for improvement? If something like this has been done before either with a DIY Pass amp or something else, then I'd like to see how it turned out.
Sure would make it easy to troubleshoot the amp..... I mean, you'd have your primary documentation right on your front panel....(!)
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Old 24th June 2013, 11:07 PM   #2030
6L6 is offline 6L6  United States
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Would the simplified schematic be better, graphically? (obviously not from the troubleshooting point of view...)

It might look better on the amp -- less busy.
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