[time-nuts] 10811-Parts... (Using the thermal regulator circuitry)

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Rick,
Thanks for this information. Actually the technology of C18 is not specified in the manual.
Why should it necessarily be « foil » type and metallized?
Is « foil » type same as « film » type?
Of course the « mass » needs to be there (=> 3D printing services)
Best
Gilles.

> Le 15 sept. 2019 à 04:43, Richard (Rick) Karlquist <richard at karlquist.com> a écrit :
> 
> The 10811 oven loop is only barely stable.  It's stability
> is limited by the amount of capacitance that you can
> get in a cap of the size that will physically fit.  BTW, this
> cap must be of the foil type, not the metallized type.
> If you are building a knock off of the 10811 and you can
> fit in more microfarads, you can make the loop work better.
> In the 40 years since the 10811 was designed, AFAIK, there
> as been zero (0) progress with respect to the capacitance
> per cubic centimeter of foil capacitors.
> 
> Of course, the real solution is to use a PII^2D controller
> like the E1938A.
> 
> Also, if you are not using a 10811 oven mass, then all bets
> are off with respect to the oven design.  You'll be starting
> all over from t=0.
> 
> Rick N6RK
> 
>> On 9/14/2019 9:41 AM, Ulf Kylenfall via time-nuts wrote:
>> Yes, I have more or less cloned the temperature regulation circuitryand used it for various heat control circuitry using other/similarsemiconductors that can handle elevated temperatures.
>> The basic principle is nothing exotic. It can be found inmany applications all over the internet.
>> What is important is that the feed-backto the thermistor bridge (R+C) is selected for a proper timeconstant so that the regulation does not thermally oscillate.
>> The thermal delay between the mechanics/heat dissipatingcomponents and the isolation resistance between the thermistorand chassis is also important.
>> All the best
>> Ulf KylenfallSM6GXV
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