I am trying to build a more complex circuit but am having trouble starting off. I am using tone() to generate a frequency on my 5V Arduino Nano on D3. If I measure the frequency directly at D3 to GND, I measure a consistent 123.15hz which is what I'm looking for. Now, If I use an NPN transistor(I have tried a S8050 and BC337) the frequency jumps between 107hz and 123hz when I measure at the emitter. I am using a 1k ohm resistor in between D3 and the base of the NPN.
Any suggestions would be greatly appreciated.