Print PDF
Favorite
Email
Step 2Amplification circuit
This is the amplification circuit. I added this because it was not sensitive enough to sound for my personal taste. Refer back to the main schematic. This section is located in the upper right and it says its the amplification circuit when you mouse over it.
The LM358 is a dual op amp, meaning that it has 2 amps on a single chip. If you chose to use a different amp for whatever reason that is only a single op amp you will need 4x total amps instead of 2 as i origanally stated at the beginning of this document. You will also need to adjust the pins. In fact, this whole section will be pretty useless to you except for the schematic.
First lets place our op amp on the board. Since i'm planning on using the other side of this dual op amp for a filter circuit i will give it space sufficient for a filter circuit. (thats 10 rows minimum, more rows makes things neater).
For the resistors on the amplifier circuit, i chose to stick with the ones i was using on my filter circuits. i'm not sure if the same rule applies to these as to R1 and R2 on the filters schematic but since that works, i chose to just stick with something that i knew worked. I used a 720 Ohm and 1k resistor. For more about selecting these values, refer to the step on the filter circuit in this document.
- Connect the output of your microphone circuit to pin 5.
- Connect Pin 6 and Ground using the 720 ohm resistor
- Connect pin 6 and pin 7 using the 1k ohm resistor
(include picture)
Pin 7 is your out put for the amplification circuit. I fed this to my potentiometer.
(include picture)
The LM358 is a dual op amp, meaning that it has 2 amps on a single chip. If you chose to use a different amp for whatever reason that is only a single op amp you will need 4x total amps instead of 2 as i origanally stated at the beginning of this document. You will also need to adjust the pins. In fact, this whole section will be pretty useless to you except for the schematic.
First lets place our op amp on the board. Since i'm planning on using the other side of this dual op amp for a filter circuit i will give it space sufficient for a filter circuit. (thats 10 rows minimum, more rows makes things neater).
For the resistors on the amplifier circuit, i chose to stick with the ones i was using on my filter circuits. i'm not sure if the same rule applies to these as to R1 and R2 on the filters schematic but since that works, i chose to just stick with something that i knew worked. I used a 720 Ohm and 1k resistor. For more about selecting these values, refer to the step on the filter circuit in this document.
- Connect the output of your microphone circuit to pin 5.
- Connect Pin 6 and Ground using the 720 ohm resistor
- Connect pin 6 and pin 7 using the 1k ohm resistor
(include picture)
Pin 7 is your out put for the amplification circuit. I fed this to my potentiometer.
(include picture)
| « Previous Step | Download PDFView All Steps | Next Step » |
 |
Add Comment
|
