This is a simple microphone circuit. I got this part of the over all schematic from whyameye
. For this section, you will need:
LM386 audio amp
0.1 uF capacitors x3
47 uF capacitro x1
Microphone sensor x1
10k Ohm resistor x1
1k Ohm resistor x1
In the schematic below, i've marked off the top left corner and if you mouse over it, it will say its the mic circuit. This is the section we will be building. First, find a section of bread board with at least 8 rows open on both sides. Since the LM386 takes up 4 rows center it in the open section you select.. This leaves 2 rows on either side that you will need later.
(include a picture of the amp centered on the open section of bread board)
Now, before we can put anything else on the bread board, we need to find out which side is the "top". The audio amp will have a small cut out shape on one end. Mine was a half circle. If you did it just as i have, then pins 1 and 8 will be in row 3 of the breadboard. If you did it differently for whatever reason, just be sure to adjust for that when i refer to specific rows later.
(include picture here of this far in the process)
- Connect pins 2 and 4 to ground. Pin 6 connects to +5v.
- Connect pins 1 and 8 together with your 47uF capacitor, making sure the anode (the longer lead) is connected to pin 1.
- Connect one side of a 0.1 uF capacitor to pin 3 and the other to row 2 on the left side of the bread board
- Connect one side of the 10k Ohm resistor to row 2 and the other side side to +5v.
- Connect the left side of row 1 on your bread board to ground.
- Connect the anode of your microphone circuit to row 2 on the left side of the bread board and the cathode to row 1, also left side.
- Connect one side of a 0.1uF capacitor to pin 6 and the other to row 7 right side.
- Connect row 7 right side to ground
- Connect one side of a 0.1 uF capacitor to pin 6 and the other to row 8 right side.
- Connect one side of a 1k resistor to row 8 right side and the other to ground.
Row 8 right side on your bread board is your out put for your microphone circuit.
I feel that testing during creation is important to make sure you are getting an expected result. I'll cover that in the next step.