To have a more reliable power source I want to use a 9V power supply, instead of the battery. So I cut the wires of a 9V power supply (I bought for my Arduino), I connected them to the voltage regulator and plugged it in.
But when I tried to send a message over my 433MHz transmitter but the relay did not turn on. Then, I unplugged the power supply and connected the battery to the voltage regulator resent the signal and the relay turned on. I used a multimeter to make sure the power supply was working and the voltage and amperage where the same.
Why does not the power supply work?
Power supply labelAC/DC ADAPTER Model No: MTR-910 Input: 100-240V ~ 50/60Hz 0.2A Output: 9V DC 1A