Help a blind man in electricity

[Tightbudget]

Sorry if this question offends some of you guys, but what to do with the grounding? And audio input and where is the +/- from the 5v source thank you

 

[Colin Mitchell]

I used to be a blind man. But about 20 years ago I stopped selling blinds.

5v is on the diagram. This is the red lead in the diagram. This is called the positive lead. The black lead from the 5v goes to the earth symbols. This is the negative lead.

 

[Tha fios agaibh]

In other words, all the ground symbols tie together and to the negative (black) supply wire. The audio input wires connect to the top of R3 and to ground (same negative wire)

Hope my answer doesn't offend anyone.

Ps; Should R3 be a variable resistor?

 

[Colin Mitchell]

"Hope my answer doesn't offend anyone."

Only the blind should help the blind.

 

[hevans1944]

I am squinting very hard, but I don't see any color in the drawing @Tightbudget submitted. Where is the red wire?

 

[Colin Mitchell]

"I am squinting very hard, but I don't see any color in the drawing"

That's what happens when the "blind leads the blind."

 

[73's de Edd]

.



ME TOO ! ! ! . . . . . . I once was technically blind also . . . . . . . . and I'm still deaf and dumb . . . . .

73's de Edd

 

[Colin Mitchell]

"and I'm still dumb."

If you are dumb, how come you know so much about electronics.?

 

[(*steve*)]

You probably need to look at the circuit here. http://web.mit.edu/6.s28/www/schematics/lm386.htm

an input capacitor is not shown on your circuit, but is a useful addition.

 

[Tightbudget]

In other words, all the ground symbols tie together and to the negative (black) supply wire. The audio input wires connect to the top of R3 and to ground (same negative wire)

Hope my answer doesn't offend anyone.

Ps; Should R3 be a variable resistor?

Oh one more thing how do i know wich one is the 123 or 4 from the triangle ic in the drawing?
.

 

[(*steve*)]

If you place the chip so the semicircular indent is at the top and/or the circular mark is at the top left corner (your chip has both , some have only one), then the pins will be on the left and right sides.

pin 1 is on the top left corner, pin 2 below it, then pin 3, with pin 4 on the bottom left corner.

Pin 5 is on the bottom right, with pin 6 above it, then pin 7, and finally pin 8 on the top right corner.

Pretty much all pin numbering goes in a circle, clockwise from the index mark.

Google for a datasheet for this component and it will have all these details as well as many more.

 

[Tightbudget]

If you place the chip so the semicircular indent is at the top and/or the circular mark is at the top left corner (your chip has both , some have only one), then the pins will be on the left and right sides.

pin 1 is on the top left corner, pin 2 below it, then pin 3, with pin 4 on the bottom left corner.

Pin 5 is on the bottom right, with pin 6 above it, then pin 7, and finally pin 8 on the top right corner.

Pretty much all pin numbering goes in a circle, clockwise from the index mark.

Google for a datasheet for this component and it will have all these details as well as many more.

thanks m8

 

[Alec_t]

Pretty much all pin numbering goes in a circle, clockwise from the index mark.

Anti-clockwise actually (unless you have one of those joke clocks ).

 

[davenn]

Anti-clockwise actually (unless you have one of those joke clocks ).

yup

 

[Minder]

And of course, the symbol used for Common implies it is connected to earth ground.
M.

 

[Tha fios agaibh]

And of course, the symbol used for Common implies it is connected to earth ground.
M.

Yes, I would think the triangle common ground would be the appropriate symbol.

Make me wonder how many people have driven ground rods into the earth trying to satisfy the ground symbols.

 

[Minder]

Dr Bruce had a good one.
M.

 

[Tha fios agaibh]

I used to hear "Ground is ground the earth around"
I guess it'd be more accurate to say,.. Earth is earth for what it's worth.

 

[Minder]

There was a lot of expressions I had to get used to when moving from UK to N.A.
One was the term ground for Chassis common and Earth.
In UK it was two distinct terms, Earth and Ground. Not as it is here, Ground for both.
The rhyme reminds me of the US 'A pint is a pound the World around', actually only in US, anywhere else it is a pound and a quarter (20oz).
M.

 

[Tha fios agaibh]

We do say ground for everything but we do specify when needed. Earth ground, chassis ground, isolated ground and so forth. Thanks to IEC terms are being standardized.
Never heard that one. A pint is a measurement of volume not weight. A liquid US pint does equal 16fl oz. But is there an imperial pint that equals 20fl oz?