I'm building a Combo Amp for someone.
The cabinet is Pine 13" wide x 15" tall and 11" deep. All glued together and used a 1/2" roundover bit in my router for the edges.
Yeah, noticed that too. Also realized that the speaker negative is connected to pin 5 of the opposite IC.
Correct, the 386 chip pin 2 is (input -) and pin 3 is (input +).
One chip has (input -) to pin 2 and output pin5 goes to (speaker -). Making up the negative side of the bridged amp.
The other chip has (input +) pin 3 and pin 5 output to (speaker +). Making up the positive side of the bridged amp.
I've noticed several schematics for the 386 chip amps that will use either pin 2 or pin 3 for input on single chip amps. But as for the battery input, pin 6 is always battery/power positive. Which is why these chips will fry if the battery/power polarity is reversed.
Not sure what CON1 & CON2 are, but presume that they are contacts on a pre-made board?
The C8 and R10 combo is common on many LM386 amp circuits, but I don't use them on mine. C9, the 1000uF cap is the filter cap relative to the battery/wall wart power source. It smoothes out the dc "ripple" to eliminate background dc noise. Notice how it connects to "ground".
R1 (4K7 ohms, or 4.7K) can be anything from 330 ohm to 4.7K ohms, and is more dependent on the color of LED used. Some LED's need higher resistance, others need less to avoid burning out the elements.
The first version of this amp that I built got smoked from the walwart polarity being accidentally reversed. I'm going to have to rebuild mine.
Some of these small chip amp will be okay if the polarity is reversed, but most of them will be toast.
True, being careful about the wall wart polarity saves a bit of frustration.
The only way is knowing the pin designations of the chip(Google Search), and following the circuits on the PCB.
I ordered the WGS 10" Veteran speaker. Can't wait to get this done.
Wanted to kill my cat yesterday. Little *&^% got in my office/project room and knocked a book off the top of the bookcase that fell right into that Utah speaker and tore a big hole in it.