mersenne31
New Member
I am trying to run a hair dryer through a KUHP relay. I have connected a 12V signal to the control lines of the relay which are switched on via a 2N3904 npn transistor. A 5V signal turns on the transistor and hence the relay. However, I have tested this circuit and it is very unreliable.
The relay sometimes turns on after a delay of about a second (you hear a slight hum before you hear the contacts click) and sometimes does not turn on at all. At other times however, it seems to work fine. I am using a USB-1024 HLS Measurement Computing DAQ to send the 5V signal.
Any advice?
The relay sometimes turns on after a delay of about a second (you hear a slight hum before you hear the contacts click) and sometimes does not turn on at all. At other times however, it seems to work fine. I am using a USB-1024 HLS Measurement Computing DAQ to send the 5V signal.
Any advice?