Robin
How are you powering the DR4018? If you are using DCC then you will have rectified DCC as the output and what you are hearing is the ripple from that rectified voltage.
A small capacitor should smooth out the ripple.
I posted a question earlier regarding the DR4018 not being able to operate a tiny LED with built in flasher, it operates a normal LED with no problems. The recommendation was to use a small relay switched by the DR4018 to operate the. LED,s.
I now have a small 5V relay with a series resistor to drop the DR4018 down from a measured 10V DC at the output terminal, the relay operates OK but with a continuous buzz.
I assume the output from the device is DC so why the buzz and can I stop it?
Robin
