i know there is no + and - for AC i mean phase and ground. i need electronic circuit for indicating phase and ground for exp with LED or buzzer. this is tool for repairing electrical device.
and i don't want to use DMM. i need very simple device.
thanks
The neon bulb in the tester is fitted with a current limiting resistor since it's operating voltage is approximately 50V. Reduce the value of the resistor until you get a bright orange display. (Additionally you could paint the body (inside around the lamp) of the tester with transparent red colour.)
The light gets brighter if you touch the metal cap on top of the tester and a piece of grounded metal (cooler case)
If that won't help shade the indicator light for better view.