any one can help on the amplifier circuit? (images)

K

kuangmao

New Member

• Apr 19, 2009

• #1

i am so sorry.....i forgot to draw the audio input jack.....
this is an audio amp.




i connected likethis

 

Last edited: Apr 19, 2009

H

Hayato

Member

• Apr 19, 2009

• #2

Why the DC inputs are connected to the potentiometer?

 

K

kuangmao

New Member

• Apr 19, 2009

• #3

both two pictures are wrong??
then which is the right way?

 

H

Hayato

Member

• Apr 19, 2009

• #4

Yes, both are wrong.

Your picture is very unreadable.
As far I can see it is powered by a DC source.

Draw it again without the connections and name the terminals so that I can help you.

 

audioguru

Well-Known Member

Most Helpful Member

• Apr 19, 2009

• #5

If the variabler resistor is supposed to be a volume control then it should adjust the level of the input, not the power supply DC voltage.

 

H

Hayato

Member

• Apr 19, 2009

• #6

I think you did not get what I have said to you, kuang.

I'll name the terminals.

Switch -> Has 3 terminals. A, B, C. From Left to Right.
Potentiometer-> A,B,C. From Left to Right.

DC + jack -> Fuse -> Switch B.
Switch A -> DC + Input.

DC - jack -> DC - Input.

Audio + Jack -> Potentiometer A terminal.
Audio - Jack -> Potentiometer C terminal and Audio - input.

Potentiometer B -> Audio + input.

Led: You'll have to add a 1.2k resistor:
Switch A --- 1.2k resistor ---- Anode
Cathode--- DC -

Look at the led base. Cathode is the flat spot.

 

K

kuangmao

New Member

• Apr 19, 2009

• #7

thanks
i get it now............

 

H

Hayato

Member

• Apr 19, 2009

• #8

Better than this, just wiring for you.

 

K

kuangmao

New Member

• Apr 19, 2009

• #9

OMG
thanks sosososososososo much....