Re: [DIYbio] Electronic requirements for redesign of Arduino PCR thermal cycler

On 02/25/2015 03:00 PM, Andy Morgan wrote:
> Yeah, fair enough.
>
> I've attached the original circuit schematic in a .gif format, which is the only one I can find. And a rough BOM in a .txt file
> with as much relevant information as I could provide. The difference in the circuit schematic is that the two resistors would be
> replaced by the cartridge heater.
>
> The mains power supply is 230V, 50Hz for New Zealand (you were close with Australia), and apparently the peak voltage would be
> 325V (230*sqrt(2)), though I'm not sure if that last bit of information actually helps.
>
> Thanks for your help John (and I don't mean that sarcastically).


25A SSR-25 DA Solid State Relay Input: DC 3-32V Output: AC 24V-380V

from your BOM says the SSR can survive 25 Amperes rms.

So, your heater is 300 Watts at 230Vrms AC, which results in what current?

Power = V*I --> 300 = 230 * I --> I = 1.3 Amperes rms.

You're fine.

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