From: Milton Aupperle <milton@outcastsoft.com>
Date: July 21, 2012 11:38:05 PM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Re: Firefly MV cameras, NIB, on ebay
The amperage is the maximum amount of juice you can put in to the Peltier - you can run it lower without any issues.
The current power supply I am using is 3 amps, I get temperature decreases of about 15°C below ambient when the camera is running. When I was shooting sunspots the camera was hitting 50+°C, the sun lit temperature was 43°C and the camera was at 25°C via the cooler.
I am just about to start my 3.5 hour WASP-2B Exoplanet run. It's a tough target at 0.022 mag drop over 108 minutes. The sky is clear, the winds have stopped and the turbulence isn't too bad - so we will see. Ambient temp is 20°C and the Grasshopper 2 camera is right now at 5°C. The uncooled Guide Grasshopper 1 model is 30°C.
TTYL..
Milton Aupperle
On 21-Jul-12, at 10:37 PM, Dave Goodyear wrote:
I noticed you used the 6 amp cooler but run it at 3.3 amps now.. Quality Kits sells the same cooler but in a 3amp model as well. I wonder how that would work? I have 2 power supplies, both rated at 25 amps. I don't want to have to run out and get a variable power supply with variable amps..
I guess I'll just have to try it..
Dave Goodyear
KB2 Networks Inc.
214 Main St. #318
El Segundo, CA 90245
310-933-2436
-----Original Message-----
From: Astro_IIDC@yahoogroups.com [mailto:Astro_IIDC@yahoogroups.com] On Behalf Of Milton Aupperle
Sent: Saturday, July 21, 2012 8:51 PM
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Re: Firefly MV cameras, NIB, on ebay
Hi Dave;
That's the "hot end" of a Peltier Cooler I built. The plans for it are on my web site:
http://www.outcastsoft.com/AstroImages/AstroIndex.html
The direct link is here:
http://www.outcastsoft.com/AstroImages/Cheap_Peltier_Cooler_2010.zip
HTH..
Milton Aupperle
On 21-Jul-12, at 8:05 PM, Dave Goodyear wrote:
Wow!!
Hey Milton.. How does that heatsink work on the camera? I just
bought a Thermal take Slim x3 that I'm going to mount on my PT GH
2.8..
Dave Goodyear
KB2 Networks Inc.
214 Main St. #318
El Segundo, CA 90245
310-933-2436
------------------------------------
Yahoo! Groups Links