Originally posted by Matthew Jones
View Post
thanks, I had it all right, just my transistors wouldn't shut off completely, so there was a like permanent short... I had to add some resistors on the darlington setup, now when the oscillator is off the trannies are off too.
After all this shorting stuff the motorycle batts were down so I'll have to recondition and equalize them again. In the mean time I've put my 7Ah gel cells, which I had just cap pulse cycled and equalized, into the circuit. I had a 12V 20W bulb on the output and let it run for an hour or so. The top batts voltage didn't move at all, be it while running or after shut down. The lower batts loose voltage though.
The frequency is 480 Hz. If someone wants to try this, you can't just set any frequency, after you work for a while with solid state SG's, selftriggered or not, you know what to look for and where the right frequency is for a given load and coil size. I believe you can't use high frequency with an air coil, as the T-switch effect in the batteries seems to work best in the 200-600 Hz area, Matt do you see this the same way?
But I just realized that an SG litzed multistrand coil is not right at all to do this in this application. It's ok to have the primary windings all together, but the secondaries need to sit somewhere else on the core. This is because unlike the SG we need direct transformer action which in an SG coil would result in a primary and secondary coil sitting right next to each other but have current in opposite direction. I'm sure this is the reason my coil is still somewhat hot, not hot as before though.
To take care of the lower batt problem one could have two extra secondary strands from the transformer feed back power to them with one diode each so that they get hit in an alternate way, say lower right batt gets hit when upper right gets hit... same for left side.
Now I have to make a new transformer...
cheers,
Mario

Leave a comment: