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Circuit Design Help
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Townie:
Hi
Im trying to work out a way to have the battery meter read the voltage when the charger is plugged in, regardless of power switch.
The Dc socket is wired so it disconnects the V- when the charger is plugged in to prevent the amplifier drawing current from the charger atm.
I have a 6 pin DIP 150mA opto solid state relay and a High/Low trigger relay board.
I thought of a pull down resistor on the Dc socket switch terminal and trigger the relay from that but that would just power on the amp, if the power switch is on.

Here is the circuit.
https://drive.google.com/file/d/1Q7YPJXcwTm54s2l_BgacQlmE-DTVCRoj/view?usp=sharing
Lesolee:

I assume that putting the battery meter in the position shown is unacceptable because it is on all the time ?
Townie:
Correct
Lesolee:
Just to clarify:
(1) the battery is connected to V+ and V-  ?
(2) the ‘charger’ does not charge the battery  ?
(3) the redrawn circuit below correctly represents the current design (apart from the meter positions)  ?

This being the case we can’t put the meter in the M1 position because it is ON all the time.

Is it acceptable to use low drop Schottky diodes in series with the battery or the charger? This may give more freedom to move things around.
Lesolee:
The first try uses two meters to show the concept:


then the second uses an extra changeover pole to switch the meter.


(1) The charger socket is not "live" to the battery so you can stick wire into it and not blow up the battery
(2) The relay is not powered from the battery so there is no additional current drain from the battery
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