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IVO Prop Motor Current Limiter and Electronic CB

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun May 09, 2010 5:49 am Post subject: IVO Prop Motor Current Limiter and Electronic CB

At 10:20 PM 5/8/2010, you wrote:


<glaesers(at)wideopenwest.com>



I made the original circuit that Bob posted.  I got all the parts from

DigiKey, including the IRFP 3703.



I was finally able to test that circuit today.  It worked exactly as

predicted.  With only the 0.1 ohm resistor, the current was limited to about

6 amps. This did not allow the motor to go as far as desired. So I added the

parallel 0.5 ohm resistors one at a time.  With both in place, it allows a

bit over 8 amps, which is where the motor just starts to strain. This is

also about the same place where the reed switch triggers.



The mosfet does get rather warm, but only if the switch is held longer than

normal.



    I've had a lot of folks become concerned with transistors

    that got "rather warm" but without puting some form of

    instrumentation on the device and then accounting for

    thermal resistances in the heat-energy transfer path,

    "rather warm" is a rather loose quantification term.

    There are instances where the surface temperature of

    a power device can get up to "sizzle-spit" temperatures

    and still be within operating limits. So if your finger-test

    of the device did not send you looking for the burn

    ointment, then there's a high probability that the

    transistor as installed and operated is going to be

    okay . . .



I also plan to build the Electronic CB circuit. When it was published, Bob's

said to wait until others had a chance to review and comment before

building, so I haven't begun that process yet.



    Go ahead an 'brass-board' it if you can. I'm still to tied

    up with table saws and paint brushes to spend time at

    the bench.



    Do you have access to a 'scope? It would be interesting

    to fine-tune/verify the value of the capacitor to make the

    circuit trip in 200-500 milliseconds after the

    green light comes on.



    Thanks for your help in the development effort.



    Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun May 09, 2010 5:54 pm Post subject: IVO Prop Motor Current Limiter and Electronic CB

At 08:13 PM 5/9/2010, you wrote:

 	  Quote: 	
		  

<glaesers(at)wideopenwest.com>



     Thanks for your help in the development effort.



     Bob . . .



----> I'm the one who is the recipient of YOUR work 



         Dennis


	


    We all have a part to play. I can plant seeds but may not

    have the time to explore their value. If folks like you

    can pick up the ball and advance it down-field, then

    value has been added. Ultimately, we wish that others

    will benefit from the sum total of everyone's start-

    up efforts.



    THAT is how the gathering of simple-ideas gets

    vetted as a recipe for success. Folks on the List

    may recall numerous conversations in the past where a

    particular design philosophy was the target of vociferous

    bashing . . . while thousands of examples had been

    flying and performing as expected for two decades.



    What we do here may flop. It may be a ho-hum success.

    It may provide the idea-seeds for yet another quantum

    jump in capability or utility. But seeds never planted,

    nurtured and harvested will never reveal their value.



    Bob . . .

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tomcostanza

Joined: 19 Oct 2008
Posts: 49

Posted: Mon May 10, 2010 2:31 am Post subject: Re: IVO Prop Motor Current Limiter and Electronic CB

 	  Quote: 	
		  What we do here may flop. It may be a ho-hum success. 

It may provide the idea-seeds for yet another quantum 

jump in capability or utility. But seeds never planted, 

nurtured and harvested will never reveal their value. 



Bob . . . 	




Thomas Edison is reported to have said after 8000 failures making a storage battery.

"Well, at least we know 8000 things that don't work."



So, IMHO, even a "flop" can be a success if it shows us what not to do.



Clear skies,

Tom Costanza



do not archive

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon May 10, 2010 5:25 am Post subject: IVO Prop Motor Current Limiter and Electronic CB

 	  Quote: 	
		  Thomas Edison is reported to have said after 8000 failures making a 

storage battery.

"Well, at least we know 8000 things that don't work."


	


    Charles Kettering's crew did over 10000 experiments searching

    for the economical and effective anti-knock additive for

    gasoline.



 	  Quote: 	
		  So, IMHO, even a "flop" can be a success if it shows us what not to do.


	


    Exactly. There's a new restaurant endeavor spinning up

    in a small town near Medicine Lodge. The guy doing it

    is a craftsman and probably a pretty good cook. His

    efforts so far in getting his facility ready are

    impressive (and expensive). But he's never run a

    restaurant before nor built an efficient commercial

    kitchen.  I'm arranging for my son (14+ years in

    a host of business and facilities) to meet him. Not

    so much to tell him WHAT to do but to assist in

    steering him around things that are proven no-nos.



    A meeting of experienced minds with long histories

    of both successes and failures is the shortest path

    to new recipes for success. Everyone from the architect

    to the folks who come to collect the trash have an

    important role to play.



    Bob . . .

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