AC common neutral
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Posts: 46,084
Hi Dave,
>you are correct in your schemaitc but you did not show that all
>grounds are tied together.
So your DC ground = AC common neutral too.
>I am attempting to use the 24 VAC through a rectifier and 7812 to get
>12 VDC for alarms
Does this mean you use a single diode/cap circuit followed by the 7812?
If so, the 7812 GND = AC common neutral. If you use 4 diodes (Greatz) and
a cap, the 7812 GND is separate from the AC common neutral.
>One multi meter was autorange and that never settled. the other was
>set on 10VDC and was very stable.
You still didn't say how the multimeters are connected.
Try to set the autorange multimeter into a manual mode. It may be that it
switches ranges due to measured ripple.
Greetings peter.
>you are correct in your schemaitc but you did not show that all
>grounds are tied together.
So your DC ground = AC common neutral too.
>I am attempting to use the 24 VAC through a rectifier and 7812 to get
>12 VDC for alarms
Does this mean you use a single diode/cap circuit followed by the 7812?
If so, the 7812 GND = AC common neutral. If you use 4 diodes (Greatz) and
a cap, the 7812 GND is separate from the AC common neutral.
>One multi meter was autorange and that never settled. the other was
>set on 10VDC and was very stable.
You still didn't say how the multimeters are connected.
Try to set the autorange multimeter into a manual mode. It may be that it
switches ranges due to measured ripple.
Greetings peter.