What else would/could do that job?

In the AM radio circuit, the potentiometer R3, and Capacitor C5 couples the tuner’s audio output signal to the volume control? correct?

Capacitor C4 decouples the tuner output?

 

Capacitor C4 decouples the tuner output?

Search “datasheet LM386” and read that. The example circuits at the end will tell you most of what you need. Then search the datasheet for the other device.

 

Search “datasheet LM386” and read that. The example circuits at the end will tell you most of what you need. Then search the datasheet for the other device.

are you saying that I should search datasheet LM386 in google?

 

are you saying that I should search datasheet LM386 in google?

Yup. Google is a tool and God helps those that help themselves (use tools). I am not your tool but I’m happy to help you help yourself (I can be confused for god sometimes but you’ll know better once you see me).

School teaches you how to find answers to problems for themselves.

 

Yup. Google is a tool and God helps those that help themselves (use tools). I am not your tool but I’m happy to help you help yourself (I can be confused for god sometimes but you’ll know better once you see me).

School teaches you how to find answers to problems for themselves.

Thanks alot. Appreciate it.

 

What else would/could do that job?

IC1

 

IC1

But the LM386 is the one connected to the speaker.

 

But the LM386 is the one connected to the speaker.

Yup

 

Doesn't the wiper arm in R3 has to move clockwise to increase the volume?

 

Doesn't the wiper arm in R3 has to move clockwise to increase the volume?

I cannot see how it is wired below and whether there is a ground symbol behind that capacitor (above left of pot). See R3 below. I would say moving the wiper down in image below will make the output quieter.

Check how the copper traces run on the back of the PCB.

 

I cannot see how it is wired below and whether there is a ground symbol behind that capacitor (above left of pot). See R3 below. I would say moving the wiper down in image below will make the output quieter.

The further the wiper move from ground the volume increase. correct?

 

Correct.

 

Correct.

Four out of the Six components that form the AM tuner are C1,C2,C3, and IC1. Correct?

 

Four out of the Six components that form the AM tuner are C1,C2,C3, and IC1. Correct?

The yellow is a slight hack way of dropping the 9v supply voltage down to 1.5 v (approximately) that the IC1 needs.

Green is the reception and tuning (R2 may be part of the gain control of the IC1). Blue inside the green circle is the antenna.

The volume control attenuated the signal as needed and C5 is a coupling to the power audio amplifier IC2.

Red circle 1 is a snubber that prevents the amplifier from oscillating.

Red circle 2 is a 10 uF cap that, according to the LM386 datasheet shows will set the IC2 gain to 200x.