|Re: ZVC ZEPROM Voltage Converter (continued)|
Message #16 Posted by Dan Grelinger on 22 July 2008, 12:00 a.m.,
in response to message #15 by Richard Ottosen
Well, Richard, would you believe that we both could be right?
After further inspection, I have verified beyond any doubt on my part that I drew the circuit correctly, as it is implemented in the ZVC. I also acknowledge that your suggested 'modification' is truly the way the chip designer indended this up-converter to be used.
A few days ago Christoph Klug sent me an email which included the following information:
"Form former direct contact with Zengrange I get some of their converter boards free – because I found out that the original coil have to small dimensions and get overheated when you are burning a complete rom contents by using the ILBURN command (= burning a full 4KByte rom page image from IL-mass storage drive to the Zeprom). Unfortunately later Zengrange stopped any support for Zenroms – and up to now I never get any feedback from than."
Bringing these two pieces of information together, it strongly suggests that Zengrange printed the PCB incorrectly, and eventually fixed the resulting problem (knowingly or unknowingly, who knows?) by increasing the current carrying capacity of the coil.
My dilemma now is.... Do I reproduce exactly, that which I know is working (at least for the half dozen times or so that I have used it), or do I correct Zengrange's original error and design my PCB correctly?
Back to the breadboard, I guess I try both.....
Or do I just buy a regulated 12 volt power supply and make a simple board that drops 12 volts on the ZEPROM's battery power input terminal with a flick of a switch. ;-)
Edited: 22 July 2008, 12:02 a.m.