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 Post subject: Incubator workings
PostPosted: Wed Oct 29, 2008 1:36 pm 
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Showy Hen
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I thought some might like to see inside my bator as there seems to be a bit of interest in home-made incubators lately.
After a few years i thought id better dismantle it to give it a good clean out and noticed it uses an oven element and simple circuit board/controller.

This is what made me take photos as ive read questions about pie warmers etc being used as incubators.
Anyway im not sure if its of any interest to anyone,but for those that are,it may provide some ideas or just inspiration.

Oh and i bought it second hand a few years ago and have hatched many many chicks in it :)
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PostPosted: Wed Oct 29, 2008 1:56 pm 
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Superior Bird
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Interesting, can you read the writing on the black components in the circuit board.


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PostPosted: Wed Oct 29, 2008 2:19 pm 
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Showy Hen
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Yep,what i can see they are
IC
CA3059

Transistor(3 legged thing)
BT136
600U

Capacitor
100UF
63V

Yellow thing(2 legs in front of IC)
333K
100

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PostPosted: Wed Oct 29, 2008 4:52 pm 
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Phoenix
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Its the Triac driver. It is varying the voltage/current to the Triac and thus the heater element.

The little round thing, is that an adjustment pot or a chassis mounted sensor?

If it isnt an adjustment, does that mean this unit is fixed temperature?

J

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PostPosted: Wed Oct 29, 2008 5:29 pm 
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Champion Bird
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Hi Crowingmad
Just added this to the home made incubator sticky.

The lower tray is just a container for water with mesh over it?

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Trev

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PostPosted: Wed Oct 29, 2008 5:33 pm 
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Showy Hen
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In the top pic you can see a blue dial not far from the red indicator lamp....that is the under side of the circuit board.In other words it has a potentiometer mounted on the circuit board which i can adjust for heat control.

Chookmadhubby it has a water dish under the hatching tray/mesh
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PostPosted: Thu Oct 30, 2008 12:27 pm 
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Superior Bird
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My goodness, that is one pretty cool IC.

Just had a quick look at it's datasheet, and I think the whole circuit is pretty much described in the datasheet. That would mean it not's a circuit that the incubator manufacturer owns rights to. Anybody can make the circuit because you are just following the IC manufacturers instructions.

It generates it's own 12V DC. Large white 5W dropping resistor simply limits the current going to the IC's own inbuilt 12V DC regulator.

Blue capacitor is simply to help filter the 12V DC.

Looks like an NTC near the terminal block. That and the potentiometer (and perhaps the small resistor) are a simple voltage divider for adjustment.

That leaves the 333K which I am just guessing is a capacitor. It could be just filtering the 12V DC or even the the resistor divider part of the circuit. It is also possible that this capacitor and the small resistor are used to snub the switching triac. That is to absorb any spikes cause by the switching on/off.

Cost of the IC I don't know but I would say this is a very cheap circuit to make. I would imagine it is very good too.

I would add a caution to anyone making this circuit not to get complacent about the 12V parts of the circuit. Don't be a fool and think "Oh, the potentiometer is only at 12Volts". It is actually at mains potential. I like to think of it as 240V and 252V rather than 0V and 12V as it keeps you more alert to what will happen if you touch it.


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PostPosted: Thu Oct 30, 2008 2:01 pm 
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Showy Hen
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Hi Denis,this is great news that the controller is not beyond remanufature as the company is no longer in business.
They have their name on the circuit board but i imagine copyrights no longer exist when the company dosent either :)

Bellsouth were able to supply incubator instructions but advise that all spare parts were no longer availible.
As for the heat controller performance,i cant imagine anything too much better.I can set at at 37.7 at that is where it stays...all the time.
And having such a large element, after opening for egg turning it is back to operating temp in no time at all.

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 Post subject: Re: Incubator workings
PostPosted: Mon Oct 13, 2014 8:09 am 
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Hatchling
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Hello, I was impressed with the simplicity of the thermostat and decided to make one like that, would it it be possible to have some little extra info, about the sizes of the resistor and the pot?
Thank you for your time
regards
angelo


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 Post subject: Re: Incubator workings
PostPosted: Mon Oct 13, 2014 9:15 am 
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Old Mother Goose
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Angelo,

This post is from 2008, and clicking on "crowingMad" profile they haven't logged into BackyardPoultry since November 2010, so I don't think you will get an answer from them,




Ron

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