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Old 05-01-2010, 10:57 PM
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FuzzyTomCat FuzzyTomCat is offline
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Hi everyone,

This post is a recap of my "LIVE" recording at "Open Source Research and Development" which is the best recorded representation of the preferred mode of operation a 5-Hour non stop video recording on January 9, 2010 using a Tektronix TDS 3054C Oscilloscope.

This 5 hour video recording is from a dead start after the scope calibration as all testing and evaluation of the circuit. Please see Image time bars for actual recorded times in hours, minutes and seconds.

Channel 1 - Mosfet Source Pin
Channel 2 - Mosfet Drain Pin
Channel 3 - 555 Timer Pin 3
Channel 4 - 24 Volt Battery Bank


Scope Trigger - Channel 1 "FALLING" signal slope [ \ ] "IMPORTANT"

"START"

First connecting the 12 Volt battery to 555 timer circuit only, adjust the "ON" potentiometer to minimum resistance (0), adjust the "OFF" potentiometer to maximum resistance (2K), resulting duty cycle is at about 21.48 %





Now Connecting the 24 Volt battery bank to the device circuit not touching the "ON" or "OFF" 555 timer Potentiometer again. The circuit now defaults to a 50 - 55 % duty cycle, no further "ON" or "OFF" potentiometer adjustments needed.



Now adjusting the "GATE" potentiometer "only" using the oscilloscopes 100ns division for minimum Mosfet source Channel -1 Mean mV from 50 to 70 and the four (4) divisions from the 555 timer "OFF" signal to the Mosfet drain or 24 Volt Battery signal "spike" combined with the Fluke 87 DMM highest voltage reading connected to the 24 volt battery bank





Now the double checking of the "GATE" potentiometer adjustment "only" using the oscilloscopes 100ns division for minimum Mosfet source Channel -1 Mean mV from 50 - 70 and the four (4) divisions from the 555 timer "OFF" signal to the Mosfet drain or 24 Volt Battery signal "spike" combined with the Fluke 87 DMM highest voltage reading connected to the 24 volt battery bank.





The Mosfet circuit is now 100 % fully functional in the preferred mode of operation and under "load" the 24 Volt Battery bank Voltage is now at 24.70 DC Volts with no further adjustment to be made on any of the circuit potentiometers.



A now recorded 24 Volt battery bank voltage increase seen on the Fluke 87 from the starting voltage of 24.70 to 24.72 DC volts.



"FINISH"

Now after approximately 5 Hours of continuous operation the 24 Volt battery bank voltage has dropped from the starting voltage of 24.70 to 24.59 Volts DC, a total decrease of .11 Volts DC , maintaining a constant 140 to 145 + degree F temperature on the "Load Resistor" which is about 5.5 watts continuous load.





Best Regards,
Glen
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Last edited by FuzzyTomCat; 05-04-2010 at 01:47 AM. Reason: better clearity
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