Selfrunning cold electricity circuit from Dr.Stiffler

[Loki67671]

Well......it doesn't look like my components will get delivered until Tuesday or so but here is a shot, I know its fuzzy, of the exciter and LITZ wire secondary. I secured an old thermos cooler and will begin setting up my calorimeter and winding various secondaries this weekend.

Best regards,

JIM

[DrStiffler]

Well......it doesn't look like my components will get delivered until Tuesday or so but here is a shot, I know its fuzzy, of the exciter and LITZ wire secondary. I secured an old thermos cooler and will begin setting up my calorimeter and winding various secondaries this weekend.

Best regards,

JIM

You did ask and I must not have answered, 'Did I recommend a data capture unit'? Well as you must know, there are many out there, yet for a 12 bit accuracy and multi functional unit that is external and USB coupled, I like the LabJack U12. It can take some time to calibrate, but you need not do it often. There are PCI boards etc., but I like the USB approach for attachments. The LabJack is good enough for general lab work and we use a number of them.

I have a Excel spreadsheet that was setup just for Sec and a special VB program that runs with the LabJack for data capture during calorimetry runs. We can maybe use or reprogram to help you during tests. It records Vs, Is, Ta, Tc, and Tw. 

[Loki67671]

Wow! LabJack has the goodies! Nice. I have some surplus DGH modules, RS485, individually addressable but the LJ offering is really cool. Automation of whatever you can imagine for well under a grand is an excellent use of technology I would say. Doc, if your offering to let me use software for automating the experiment I'll be glad to oblige, thank you. I'm just waiting on the UPS man, 

JIM

[Loki67671]

All,
Here is a shot of the 1st board with the exciter and secondary in micarta standoffs and the proposed changes to comply with Dr Stiffler's observations and comments. A second driver board is also being lay-ed out and will be assembled once the new components arrive via UPS. I will also likely trim the micarta standoffs down quite a bit when I can hit the bandsaw and drill press.

@Dr. Stiffler,
Please review and comment at your convenience if you would be so kind. I managed to come damned close to the 2uH -> 10uH for the new oscillator. 2.4uH -> 9.35uH       In the photo I have outlined the proposed build area for the AV plugs and probably several different loads for experimentation. The new board will be built once and when satisfactory low level testing passes and will be used for the calorimetry runs. The DAQ's I'm using are 15 bit with a resolution of 0.02% FS, 1 channel differential analog input, with programmable large and small signal filtering plus a definable transfer function filter. I'm going to attempt differential temp measurements along with absolute temperature measurements but I want to make sure that at absolute minimum I am gathering data that is equivalent to or as close to the same manner as you are. So we must discuss the test plan and data format at some point.

My temperature sensors will be based from the National-Semiconductor data sheet for the LM335AZ and I have attached a snapshot copy of those for additional review. All in all we are moving fairly well given the massive research grants we get from the NSF and Dept. of Energy..............Not!!!   

Best regards,

JIM

[Loki67671]

Dr. Stiffler,
In the effort to reduce stray C, have you also shortened the LITZ secondary leads? I'm considering cutting the micarta down to much smaller footprint and mounting to the PCB between the oscillator and AV development area. Comments?

JIM