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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Analogue moving coil meter range extension?
Hi All,
Not a 'repair' question as such but I was thinking of using an old skool 250uA FSD moving coil panel meter to read the 10 to 15V DC range (a lead acid battery charge / discharge indicator), next to a 0-30A Ammeter (inc shunt etc). I was thinking of using either a voltage reference such as LM4040DIZ-10.0 or could I get away with a simple zener (BZX55C?) with associated resistor(s) please? Once I have the 10V (that might need it's own drive resistor?) for the -ve side of the meter I think I'd need a 20k resistor in series with the meter to my 10-15V supply (a lead acid battery)? R = V/I = 5 / 250 x 10^-6 = 20k ohms. Or ... I could use a straight potential divider on the grounds that a moving coil meter isn't going to be that accurate in the first place? Maybe: -Ve, 10k, 5k, +Ve with 20k in series with the meter across the 5K? Am I close please? ;-) Cheers, T i m |
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