- After testing my galvanically isolated power supply to power my two volt / ammeters Chinese, there was a problem: the power is "fout short-juice" as soon as I feed both volt / ammeters (red wires and black) by the little transformer ... Grrr!
- But, trying to feed ONLY ONE of these volt / ammeters, I realize that it works "nickel"! After careful reflection, I came up with an idea: to feed the positive volt / ammeter with the small transformer and the negative by + 5VSB, to take the mass on the -0 / 24V and to mount a stabilized power supply (6V will be perfect)!
- Here is the diagram:
- Symmetrical Chinese VA Adaptation3.jpg (99.85 KIO) Accessed 4682 times
- You will notice :
* the power supply of the positive volt / ammeter with the small transformer galvanically isolated,
* the power supply of the negative volt / ammeter by + 5VSB, so that even 0V, we see the display, and its mass on the -0 / 24V! By the small stabilized power supply, the voltage does not exceed 6V, even when the voltage is maximum (-24V)!
- Here is a photo of the tests:
- And there, it works "nickel"! All that remains is to "tweak" the optocoupler setting to indicate the same voltage as the negative voltmeter. For the intensity, nothing to say!
