Hi!
I have a battery operated toy that uses capacitive touch switches. When operated from a 9V switch mode power supply, the buttons behave totally erratically! However, when operated from the battery, it works really well. When operated from a proper big lab power supply, it works really well too.
Furthermore, if I touch the metal case when using the 9V switch mode power supply, it works really well..
So, given these conditions above, my question is: what could cause this and how can I fix it so it works with a simple 9V power supply?
I have a battery operated toy that uses capacitive touch switches. When operated from a 9V switch mode power supply, the buttons behave totally erratically! However, when operated from the battery, it works really well. When operated from a proper big lab power supply, it works really well too.
Furthermore, if I touch the metal case when using the 9V switch mode power supply, it works really well..
So, given these conditions above, my question is: what could cause this and how can I fix it so it works with a simple 9V power supply?