I really need to change the memory retention battery in my 4808. What I intend is to use a small floating PSU with a blocking diode to supply just under the battery voltage to the memory circuit, then unsolder and replace the battery. However mistakes do happen, so does anyone know of a way to read the contents of the Calibration RAM (and to restore in case of disaster)? Has anyone ever been down the FRAM route? The existing RAM is a TC5564PL (8k x 8) so a FM1608 may well work fine... Thanks Dave Partridge

I know this is common knowledge but it doesn´t hurt to remember... your soldering iron / station is usually grounded so it will short the pin to ground while soldering. When I do soldering in an energized circuit i heat the station then unplug it from wall when soldering. Daniel Em 06/02/2018 07:17, David C. Partridge escreveu: > I really need to change the memory retention battery in my 4808. > > What I intend is to use a small floating PSU with a blocking diode to supply > just under the battery voltage to the memory circuit, then unsolder and > replace the battery. > > However mistakes do happen, so does anyone know of a way to read the > contents of the Calibration RAM (and to restore in case of disaster)? > > Has anyone ever been down the FRAM route? The existing RAM is a TC5564PL > (8k x 8) so a FM1608 may well work fine... > > Thanks > Dave Partridge > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.