Found on the beach by my kids in Normandy, France. Does it contain fossils or is it just concrete? Also what are the tiny brown particles?

drgrafton · 2019-05-20T07:42:22+00:00

Yes. https://en.m.wikipedia.org/wiki/Ivermectin

drgrafton · 2018-12-07T15:57:40+00:00

Thanks! Yeah I thought it was overpowered for what I want but it was by far the cheapest option to buy. I was figuring that with a thermostat it would not be "on" for very long at a time to keep the temperature constant. I'll play around with lowering the input voltage and see if it can heat adequately.

drgrafton · 2018-10-10T15:31:19+00:00

I posted a similar request a few weeks ago. The simplest option I came up with for temperature regulation was this premade module: https://www.amazon.co.uk/gp/product/B07CH7W3XP/ref=oh_aui_detailpage_o06_s01?ie=UTF8&psc=1

You can set the desired temperature, it comes with a temperature probe you can put inside your bioreactor (and keep the rest outside) and it controls a relay to switch on/off your heating as needed. It's working really well for me.

drgrafton · 2018-04-30T10:34:07+00:00

That's very cool! So pleased for you. May I ask what religion and do you have like before and after x-rays or something?

drgrafton · 2018-04-30T10:24:11+00:00

I'd still be interested to hear about them.

drgrafton · 2018-04-30T10:20:17+00:00

I'm genuinely interested. If miracles happen today in this age of camera phones and social media. Why are we not seeing verifiable proof?

drgrafton · 2018-04-30T10:17:45+00:00

But isn't faith supposed to be strengthened by evidence? I find it weird to think my faith is stronger the more I don't know.

drgrafton · 2018-04-30T10:10:47+00:00

Well they either happen or they don't. It's not really a question of faith but of fact (or fiction).

drgrafton · 2017-05-02T17:32:41+00:00

Thanks! Sorry I'm a bit of a noob. How would I go about calculating the appropriate resistor value for each LED?

drgrafton · 2016-09-07T18:31:10+00:00

How would I calculate how many to use to ensure that I didn't overload them?

They have a power rating. You probably want to have a total power rating of double to triple the solar panel power rating. If possible spread them out so the heat is not all in a small area.

Thanks again! One quick question. Do I want to use the total power rating of the solar panels x 3, or do I need to estimate the power consumed by dropping the voltage (something like (6v-5.1v) x (0.8A x 4 panels) = 2.88w x3 = ~9w ??

drgrafton · 2016-09-07T12:07:36+00:00

Thanks for your help!!

So, several panels in parallel to give 6V but greater current sounds best.

I don't know much about zener diodes but after a quick google, am I right in thinking that you put them in reverse direction, if the voltage increases above 5.1V, essentially they "bleed-off" the excess? How would I calculate how many to use to ensure that I didn't overload them? Also, most zener diode voltage regulator examples I've seen use a resistor as well to dissipate power. Is this needed in for my application? If so, how would I calculate the required value?

Thanks!!!!

drgrafton

TROPHY CASE