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Step 7The Amp Circuit
R2 = 100 K 1/4 W metal film resistor
R3 = 1 KΩ 1/4 W metal film resistor (this gives a huge gain of 11, we will change this later but for now put in the 1k.
R4 = 10 KΩ 1/4 W metal film resistor
C2= 0.1 µF metallized polyester cap (X2) Radioshack(272-1069) Digikey(E1104)
NOTE! in the diagram it show r5 being a resistor, in most cases a resistor isn't needed and another jumper is used, a resistor is only needed if there is distortion ir a hiss when no audio source is connected. so for now solder a jumper in place of r5 as i have.
As you will see i have bent the resistor legs to make it look neither, i suggest you do the same.
Also 2 lengths of wire need to be soldered, the diagram shows these on top however as show in the image below i soldered them beneath also for neatness.
also to note is that the amp is not put in place until last to save it being stressed from the heat of the board as you solder.
I recommend you use a continuity tester (in a multimeter) to test from solder bridges and shorts, remembering where the jumpers are.
however this can be skipped.
Now onto adding the external parts
R3 = 1 KΩ 1/4 W metal film resistor (this gives a huge gain of 11, we will change this later but for now put in the 1k.
R4 = 10 KΩ 1/4 W metal film resistor
C2= 0.1 µF metallized polyester cap (X2) Radioshack(272-1069) Digikey(E1104)
NOTE! in the diagram it show r5 being a resistor, in most cases a resistor isn't needed and another jumper is used, a resistor is only needed if there is distortion ir a hiss when no audio source is connected. so for now solder a jumper in place of r5 as i have.
As you will see i have bent the resistor legs to make it look neither, i suggest you do the same.
Also 2 lengths of wire need to be soldered, the diagram shows these on top however as show in the image below i soldered them beneath also for neatness.
also to note is that the amp is not put in place until last to save it being stressed from the heat of the board as you solder.
I recommend you use a continuity tester (in a multimeter) to test from solder bridges and shorts, remembering where the jumpers are.
however this can be skipped.
Now onto adding the external parts
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Jul 26, 2009. 8:39 AMthesecret-96
says:
can i use the Dual Op Amp from radioshack (276-1715)?
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Mar 21, 2010. 1:01 PMBrad I.
says:
Did you ever get an answer to this? I would like to build this. Thanks
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3
May 10, 2009. 6:02 AMCew27 (author)
says:
0.1 µF metallized polyester cap (X2) Radioshack(272-1069) Digikey(E1104)
Reply
May 9, 2009. 4:39 PMYoshidude963
says:
what is capicitor 2?
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