basically I have been trying to learn a little electronics to make myself a tester for work but am finding out that the circuit I require is more complicated than I thought and that Im very good at wiring and not so good and designing electronics.
what Im trying to do is make a polarity tester for work. at the moment I use a resistor block that I made and a modified multimeter.
I need a tester that I can just plug in and it just displays a pass fail by way of green or red LEDs I can build it but I need an electronic design.
so I have a resistor block with 10 ohms for Active conductor 20 ohms for neutral conductor earth is on the other side of the 2 resistors but I can make a new resistor block if other resistance values work better.
so the tester that I plug in to power sockets needs to have:
3 wire input ACTIVE, NEUTRAL and EARTH (linked to the resistor block)
1 green LED if the resistance equals 30 ohms between ACTIVE - NEUTRAL or a red LED if the resistance is more than 2 ohms different
1 green LED if the resistance equals 10 ohms between ACTIVE - EARTH or a red LED if the resistance is more than 2 ohms different
1 green LED if the resistance equals 20 ohms between NEUTRAL - EARTH or a red LED if the resistance is more than 2 ohms different
a 9V battery supply
and for safety it needs to either trip something out or cope with 240v between ACTIVE - NEUTRAL and ACTIVE - EARTH (maybe light up a danger indicator lamp)
would something like this be very complicated ? or is there a simple solution?
Thanks guys and girls
what Im trying to do is make a polarity tester for work. at the moment I use a resistor block that I made and a modified multimeter.
I need a tester that I can just plug in and it just displays a pass fail by way of green or red LEDs I can build it but I need an electronic design.
so I have a resistor block with 10 ohms for Active conductor 20 ohms for neutral conductor earth is on the other side of the 2 resistors but I can make a new resistor block if other resistance values work better.
so the tester that I plug in to power sockets needs to have:
3 wire input ACTIVE, NEUTRAL and EARTH (linked to the resistor block)
1 green LED if the resistance equals 30 ohms between ACTIVE - NEUTRAL or a red LED if the resistance is more than 2 ohms different
1 green LED if the resistance equals 10 ohms between ACTIVE - EARTH or a red LED if the resistance is more than 2 ohms different
1 green LED if the resistance equals 20 ohms between NEUTRAL - EARTH or a red LED if the resistance is more than 2 ohms different
a 9V battery supply
and for safety it needs to either trip something out or cope with 240v between ACTIVE - NEUTRAL and ACTIVE - EARTH (maybe light up a danger indicator lamp)
would something like this be very complicated ? or is there a simple solution?
Thanks guys and girls