Selfrunning cold electricity circuit from Dr.Stiffler

[DrStiffler]

Loki WHOA is right  sweet @ DR nice 10.7  I feel like a little kid waiting for my secret decoder ring {thanks mr F]  Chet

@ramset
Are you in the US? if so check the tracking number, if you are non-us blame customs.

Drop me an email to drstiffler if you think it is lost....

[DrStiffler]

@loki
Should be the next video, had a small problem with blackout on 121.5. 

[DrStiffler]

So if you are going to consider a SEC Exciter more than a novelty you need to get some heat from it to test for excess. Of course not all of you will even attempt this, but I know there are many that are and wondering why such a small production from their board. The SEC15-3 as supplied will produce in the range of 0.89 -> 1.15~ this places you so close to the error margin you need a bit better.

I am going to try and get a number of videos up today on how to do the minor mod that makes a major difference and cover how I built the small calorimeter I have been using.

The first video is here;

http://www.youtube.com/watch?v=EA3XKg7OzbY

[Yucca]

OK, just tested my first calaromiter. My idea is to make two identical units and run them side by side at the same time, one with a resistive heater, one with a SEC.

The calarometer is made from easily obtained materials:

An aluminium drink can with the bottom roughed up by emery serves as the vessel. The can is then wrapped in a 25cm tube of bubblerap that's 10 sheets thick on the wall. Underneath the can is placed 4x470ohm 1/4watt resistors for a 1watt heater. A thermometer is placed in the can, also used as a stirer prior to reading. The contraption is weighed and then filled with water and weighed again to calculate water mass. The tops and bottoms of the bubblewrap tube are squeezed shut like cuffs using wire twists. The power is applied and the test begins, results follow:

Code Select Expand


========================
CALIROMETER TEST RESULT:
========================

water specific heat capacity:
4.184 J/g?C

Ambient temp.:
19?C

Water mass:
279 grams

heater power:
85mA * 9.94V =
0.845 Watt

heating time:
3h35m == 12900s


start temp.:
15.5?C

finish temp.:
22.0?C

delta temp.:
6.5?C +/- .5?C

input energy:
12900 * .845 =
10900 Joules

water heat rise:
6.5 * 279 * 4.184 =
7588 Joules

Efficiency as a water heater:
0.696


[DrStiffler]

@Yucca
Excellent work, but what I might ask is do you feel that this method does not require calibration? In other words I might be inclined to have a calibration resistance in each side and power both for a cal period to be sure there is no offset from the two sides, then would use that offset in the final calculation??