Originally posted by minoly
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hi to all
great forum here. spent 5 days reading before starting, so i was aware of the problems people were facing. one thing i learnt was follow instructions, get the first one working. then experiment. built my first ssg 3 days ago, carefully, spun it, and it did not work. i know electronics and so i knew the transistor was soldered correctly diode was correct coil resistance was 5.6 and 10 ohms, so knew it was correct, not short, i knew the pulse was not there to switch on the transistor, but i did not know why? so i left it as it was and did not sleep for 24 hrs , i had to get it right, something as simple as this had to work, well after some time of trying to sleep(which did not happen) sat in front of ssg and checked the magnets, guess what?they had lost all power!! nothing,! could not attract even a pin. that is when i realized should have followed instructions to the T. i was using alnico bar magnets, please everybody do not use those. i had some neo magnets that i had removed from old hard disk, i broke it into small pieces, 3mm sort of , stuck it on the hard disk platter and gave it a spin , and voila it started,
watched it spin for some time and decided to charge the first battery. the voltage would not rise at all, i had done the adjustment using the preset, connected 1ohm resistor, voltage across it was less then 1 volt and it was not heating so i thought it was correct, why was the voltage not rising in the battery? even after 2 days. very slight maybe 1 volt or less , so what was wrong now, read this and previous post, tried cleaning the bearing, changed transistors, tried a different pickup coil , varied the triggering angle, the speed would pick up, but there was no output. volts. maybe the small magnets were not being repelled hard enough, so i took the neo magnet from another hard disk, really powerful, and stuck it on the core, which was the I section of a burnt out transformer, and the disk picked up speed, now is the interesting part, I connected the charging battery and watched the multimeter, the voltage was increasing slowly but steadily. i also observed that there was a slight hum coming from the circuit. and every time the resonance would phase there was an increase in voltage, the battery picked up 1 volt within an hour.
so now i understand what tuning meant. you have to listen carefully and adjust the pot until you can hear a steady hum shifting very very slowly. i also noticed that when the voltage increased the resonance would change and the circuit would automatically try to realign itself. and when it did there would be another increase, i think the circuit was trying to match the impedance of the battery, and it did it brilliantly. no electronic circuit can come even close to ssg. electronic circuits are just desulfators. compared to ssg. i will observe and post further results. what i want to tell here is, listen to it to tune it, everything else will follow.
another .5 volt increase by the time i wrote this . (the battery is 12 volt 7ah has not been used for more the 2 years , initial voltage was around 5 volts, got it up using a conventional charger then connected it to ssg)
if this is in the wrong section please do the needful
bye
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