| Electronics > Beginners |
| Voltmeter for negative voltage |
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| perieanuo:
On other hand, a new chinese avmeter is under 5 euros.you don't have the space for a second one?switches is really ancient and bad idea on long term. Pierre Envoyé de mon iPad en utilisant Tapatalk |
| AngraMelo:
Everything is ready. The PS is ready on the enclosure and I decided to put the volt meter just now. Im trying to make everything fit. I understand that using 2 is by far the easiest but it just does not fit. Even if I take everything apart. |
| fsr:
I don't think that you can use this meter even if you had two of them, because you need to connect the ammeter over the negative wire, but this is a split supply, so just imagine what will happen if you have two 1A loads, one on the positive side, and other in the negative side: the current over the GND wire will be 0A. Are you interested in a future meter project? Maybe you could "arduino" a meter. There are some small arduino boards out there, or you could use the "naked" atmega328 on your own board. |
| perieanuo:
--- Quote from: fsr on December 06, 2018, 11:44:20 pm ---I don't think that you can use this meter even if you had two of them, because you need to connect the ammeter over the negative wire, but this is a split supply, so just imagine what will happen if you have two 1A loads, one on the positive side, and other in the negative side: the current over the GND wire will be 0A. Are you interested in a future meter project? Maybe you could "arduino" a meter. There are some small arduino boards out there, or you could use the "naked" atmega328 on your own board. --- End quote --- Have you understood my schematic?positive branch measures load crt by interposing secong gnd point, in negative branch wiring same thing happens and current resistor inside ammeter is on negative input... Envoyé de mon iPad en utilisant Tapatalk |
| perieanuo:
--- Quote from: AngraMelo on December 06, 2018, 02:13:40 pm ---Everything is ready. The PS is ready on the enclosure and I decided to put the volt meter just now. Im trying to make everything fit. I understand that using 2 is by far the easiest but it just does not fit. Even if I take everything apart. --- End quote --- Remember point 2 , all switches must change state same time.otherwise you risk to burn avmeter Regards,pierre Envoyé de mon iPad en utilisant Tapatalk |
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