When you make an audio amplifier you often want to test the circuit before putting it in the box or encasement. The encasement procedure involved connecting wires to plugs and sockets.

This short article is about making connecting your circuit to an audio plug that is part of the testing procedure.

What you see in the photo is a 6.5 mm stereo audio plug.

Step 1: Make the Circuit

You can see that I included two 2 Watt 10 ohm resistors. Those resistors protect the audio output from short circuits. 

Bottom view:

Conclusion

Although a 10 ohm resistor will protect speaker and earphone outputs from short circuits, it will not be sufficient to protect the line outputs from short circuits. You will need to use a 1 kohm resistor instead.