When we finish part of the circuit, there is a simple way to check whether the part of circuit works.
There are several tools that are involved in testing.
- Power (input: AC110/220V output: DC12V 20A)
3. universal electric meter
Take the first circuit for example
There is a terminal labeled “+12v”. Connect the terminal(the blue thin line in the picture below) with the positive port of the power, shown as the figure below.
Then, connect 5 terminal that are not labelled with the ground.
Next, connect one end of speaker with the ground and connect the other with a terminal labelled “To mixer input”
Last, connect the power with the wall plug.
If a changing sound can be heard, the part of circuit works.
The frequency range of the speaker may be not acceptable by the human ear. We can measure the electric potential between 2 ends of the speaker. If the voltage rading shown on the meter is periodic like a sine function,it also means that the cuicuit is OK.