15 Nov
2010
15 Nov
'10
1:14 p.m.
It is a B & K Model 2102 Audio Analyzer. I'm
certain it does have a negative
supply for the RS232 ( no Maxim chip back then ). P/S has two " Molex " type
From your first message, I didn't even know it had
an RS232 interface...
It would be possible to get the voltages for that in some other way (e.g.
using a diode/capacitor multiplier driven from a buffered logic-level
clock signal), but I think it's unlikely. Having suitabrl outputs from
the main PSU makes more sense.
connectors; one 9 pin male and one 12 pin female. It
has a ridiculously
complex inter-connect so it will run at any " reasonable " input
voltage user selectable ( I don't care about the input voltage(s).
Definitely OP-Amps so I'm checking Voltage ratings on the bypass caps for a
clue on the analog plus and minus voltages. I hate digging thru epoxy. It's
You should also check the data sheets on any unuual/complex analogue ICs
to see if they have particular supply requirements. Most op-amps have a
fairly wide supply range, other things may not...
-tony