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Offlineblackout
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Build your own magnetic stir plate
    #4243102 - 06/01/05 06:02 AM (12 years, 6 months ago)



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Edited by blackout (06/01/05 06:04 AM)


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InvisibleArp
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Re: Build your own magnetic stir plate [Re: blackout]
    #4243123 - 06/01/05 06:45 AM (12 years, 6 months ago)

Sweet links! tnx


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Offlineblackout
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Re: Build your own magnetic stir plate [Re: Arp]
    #4243148 - 06/01/05 07:14 AM (12 years, 6 months ago)

They over complicate things a bit. If you get an old phone charger you can hook it to a pc fan. No real need for a potentiometer if your charger is a low voltage, I have all the stuff I need already, I'll post pics when built.

Old magnets can be salvaged from motors or fridge magnets


--------------------
support the free spore ring http://fsre.nl/


Edited by blackout (06/01/05 08:24 AM)


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Invisibleohmatic
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Re: Build your own magnetic stir plate [Re: blackout]
    #4243181 - 06/01/05 08:08 AM (12 years, 6 months ago)

Quote:

blackout said:
They over complicate things a bit. If you get an old phone charger you can hook it to a pc fan. No real need for a potentiometer if your charger is a low voltage, I have all the stuff I need already, I'll post pics when built.

Old magnets can be salvaged from motors or mobile chargers (transformers)




the part about the phone charger is VERY interesting,
please post it with detailed explanations.
peace ohm :mushroom2:


--------------------
:penis: MONOTUB tek :sun: HEATBOMB tek :penis:

RIP #cultivation! ....can't associate? well FUCK U !


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Offlineblackout
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Re: Build your own magnetic stir plate [Re: ohmatic]
    #4243194 - 06/01/05 08:20 AM (12 years, 6 months ago)

Sorry, my mistake about magnets in phone chargers, they have coils of wires which can be used to make electro magnets, but have no permanent magnets in them. Elevtric motors do though. Fridge magnets may do too. A pc fan will have a small magnets.

Chargers are basically transformers which will bring your 110/220V supply down to usually 3-9V. I hooked a pc fan up to a phone charger directly. I got some nice big fans from a server pc. There are lots being thrown out every day, same with chargers.

Basically you just strip the charger connector off and strip back some of the wires on both. The do the same with your fan. Some fans have 3 wires. Link the wires up until you get the right combination, i.e. moving and blowing like it should. If there is no movement take the wires off quickly, There is no real danger of overheating or electric shock since the power involved is very low. When you get the right combination twist the wires together and cover with sellotape or insulating tape.


--------------------
support the free spore ring http://fsre.nl/


Edited by blackout (06/01/05 08:23 AM)


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Invisibleohmatic
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Re: Build your own magnetic stir plate [Re: blackout]
    #4243199 - 06/01/05 08:23 AM (12 years, 6 months ago)

so hooking the fan to the phonecharger works?
giving a pc fan 3-9 volt will just controll its rotation speed?
peace ohm :mushroom2:


--------------------
:penis: MONOTUB tek :sun: HEATBOMB tek :penis:

RIP #cultivation! ....can't associate? well FUCK U !


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Offlineblackout
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Re: Build your own magnetic stir plate [Re: ohmatic]
    #4243204 - 06/01/05 08:27 AM (12 years, 6 months ago)

The mobile will give the fan a fixed speed, unless you use a potentiometer. The potentiometer varies the voltage (down you wont be able to speed up). If your fan runs too fast with a 9V charger then a 3V may be better. Variable transformers are very cheap anyway, many have a good range, 1.5,3,6,9,12V is common. Generally the bigger the pc fan the more volts it needs.
Many fans have ratings on them, it is best not to go higher than the rated voltage, as it may burn out the motor eventually.

Potentiometers can be salvaged from radios (volume control) or from headphone inline volume controls (though these are only suited to low power)


--------------------
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Edited by blackout (06/01/05 08:29 AM)


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