As far as the warm end of the temperature spectrum goes, I have used a
Crockpot without the crock and put a thermometer probe inside. when I
wanted it to stay at a specific temperature I threw a blanket over it and
shut it off. I suspect you could get it to hold temperature better by
simply contr
Hi Rick:
I've used two types.
1. Most of the replies have been for controlled air temperature devices. These are by far the most common but also they
take a long time to change temperature.
2. Hot/Cold plates are much faster since the DUT is in close contact with the plate. We used these with
It is amazing what is available for 10 - 20 dollars. Some of the LED
drivers have a dimming input on the low voltage side. Not sure of the
detailed implementation of a din temperature controller with 4-20 mA
output, but it might be as simple as tl431 shunt reference and a resistor
network to map 4-
On 9/5/2016 9:48 PM, Richard (Rick) Karlquist wrote:
> As we all know, step #1 in making a clock is NOT
> to build a thermometer :-)
>
> I thought I would check the brain trust here to see
> if anyone has seen a hobbyist grade temperature
> testing chamber or kit or homebrew design.
> Rick Ka
Also avoids thermomechanical fatigue failure in the Peltier device.
On Wednesday, 7 September 2016 12:14 AM, jimlux
wrote:
On 9/6/16 1:19 AM, Adrian Godwin wrote:
> On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington
> wrote:
>
>> Rick,
>>
>> I'm going from memory here. My former business
On 9/6/16 1:19 AM, Adrian Godwin wrote:
On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington
wrote:
Rick,
I'm going from memory here. My former business partner (now deceased) had
a "beer fridge" setup as an environmental chamber for our instruments. The
trick for stability was to run the AC comp
On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington
wrote:
> Rick,
>
> I'm going from memory here. My former business partner (now deceased) had
> a "beer fridge" setup as an environmental chamber for our instruments. The
> trick for stability was to run the AC compressor all the time, and push
> ag
Constant temperature chambers are not hard to build.
I assume you want stability in the range 0.001 to 0.01 degC.
I have made a few of these chambers, about 1 cubic feet, out of 3/4 inch
particle board,
it is not a brilliant insulator, but you want some heat loss.
Make a partition at one end with
There are cheap GC (gas chromatograph) ovens on eBay. They are
well-insulated and give you fast, precise temperature control. Some of
them are designed with a liquid nitrogen input for cooling. Otherwise,
you can use dry ice. I saw one mentioned on one of the mailing lists I
read, maybe this
You don't need exact control of the temperature. You just need a slow rate
of change and the ability to measure the temperature accurately.
I have used a picnic cooler with some water in the bottom and a very small
fish tank heater. But this was for an experiment in a home biology lab not
an ele
Rick,
I'm going from memory here. My former business partner (now deceased) had
a "beer fridge" setup as an environmental chamber for our instruments. The
trick for stability was to run the AC compressor all the time, and push
against it with heat lamps. The lamps were controlled with an Omega
rich...@karlquist.com said:
> I thought I would check the brain trust here to see if anyone has seen a
> hobbyist grade temperature testing chamber or kit or homebrew design. I
> have some crystals, oscillators, and other electronics I would like to
> characterize over temperature. I know this r
As with most things here - it depends.
I have a converted wine cooler I use for some things. Bought it for $20
at a flea market. It had blow a fuse on the power supply. This appears
to be a common failure. Won't handle much thermal load, but it's a
Peltier unit, so it will heat as well if wired c
On 9/5/16 8:52 PM, Scott Stobbe wrote:
The bargain price mini coolers are often peltier cooled, they appear to
fall under the marketing term "thermoelectric mini-fridge". I can't think
of a project name, but I'm sure I've seen this done before using a mini
fridge.
https://www.amazon.com/AGPtek
On 9/5/16 7:48 PM, Richard (Rick) Karlquist wrote:
As we all know, step #1 in making a clock is NOT
to build a thermometer :-)
I thought I would check the brain trust here to see
if anyone has seen a hobbyist grade temperature
testing chamber or kit or homebrew design. I
have some crystals, osc
The bargain price mini coolers are often peltier cooled, they appear to
fall under the marketing term "thermoelectric mini-fridge". I can't think
of a project name, but I'm sure I've seen this done before using a mini
fridge.
On Monday, 5 September 2016, Richard (Rick) Karlquist
wrote:
> As we a
Better stock up on 60W bulbs. They are becoming outlawed.
(Only kidding, a resistor works as well.)
Also, a foam drink cooler will give a more stable temperature. You can make it
leak a bit of heat to get the thermostat to cycle. The hard part is the
thermostat; they aren't cheap - even the lo
Yo Richard!
On Mon, 5 Sep 2016 19:48:14 -0700
"Richard (Rick) Karlquist" wrote:
> I thought I would check the brain trust here to see
> if anyone has seen a hobbyist grade temperature
> testing chamber or kit or homebrew design.
When I did this for testing labs, I took a cardboard box, a 60w
in
As we all know, step #1 in making a clock is NOT
to build a thermometer :-)
I thought I would check the brain trust here to see
if anyone has seen a hobbyist grade temperature
testing chamber or kit or homebrew design. I
have some crystals, oscillators, and other
electronics I would like to char
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