I'm building this Voltmeter together with the supply 30V-3A from the projects. Now I have some questions about it:
1) How can I supply the voltmeter if i'm using a transfo with only one secundary from the dc supply? If I put a voltage regulator 7905 behind it, can I messure the output voltage correctly then?
2) If I use the schematic out of the datasheet from the icl7107 i can' t get the correct voltage on my display. I can regulate it to 0 at 0V but I can not get the correct output from a input voltage.
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Led display Digital Voltmeter question
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Hi everyone,
I'm building this Voltmeter together with the supply 30V-3A from the projects.
Now I have some questions about it:
1) How can I supply the voltmeter if i'm using a transfo with only one secundary from the dc supply? If I put a voltage regulator 7905 behind it, can I messure the output voltage correctly then?
2) If I use the schematic out of the datasheet from the icl7107 i can' t get the correct voltage on my display. I can regulate it to 0 at 0V but I can not get the correct output from a input voltage.
I hope someone can help me out with this,
Greetings Wiggle