[Noisebridge-discuss] type of diode needed for relay/arduino circuit

[Christoph Maier]

Hi again Frantisek,

it looks like the diode is in parallel with the relay winding and reverse
biased if the arduino drives the relay coil.
As the current to the relay coil is switched off, the diode allows the
energy in the relay coil to dissipate
without frying the drive circuit.

If I'm guessing correctly what the diode is supposed to do, a plain old
1N4001 <http://www.diodes.com/datasheets/ds28002.pdf> will do.

Christoph

On Tue, Jun 12, 2012 at 4:13 AM, Frantisek Apfelbeck <algoldor at yahoo.com>wrote:

> Could someone tell me what type of diode is the one on the picture - link
> below?
>
> https://noisebridge.net/wiki/Temporary_IE
>
> We need to connect relay to the peltier device (100w) and to arduino, it
> is heart of the cooling/heating system of the experimental incubator. We
> took this picture some year and half ago but I do not know what type of
> diode it is and I need to buy some for tomorrow. We are going to repeat
> this "experiment" and hopefully also connect 10 kohm based thermistor and
> measure temperature.
>
> Thanks for any hint,
>
> Sincerely,
>
> Frantisek Algoldor Apfelbeck
>
> biotechnologist&kvasir and hacker
>
>
> http://www.frantisekapfelbeck.org
>
>
> "There is no way to peace, peace is the way." Ghandi
>
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>
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