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Help making a Banzai V2 Cmoy.

post #1 of 35
Thread Starter 

I got a Banzai V2 Cmoy DIY kit off ebay. There is a nice picture of underneath.....

 

newstereo-1234690873-218.jpg

 

and a circuit diagram.......

 

v2_10wm.jpg

 

and here is a picture of a supposedly completed one...

 

newstereo-1234690849-216.jpg

 

but it is missing two large blue capacitors that come with the kit and are shown on the diagram. Has anyone got a picture guide or even a picture showing what it should look like inside, so I can see what goes where?

 

Thanks.

post #2 of 35

Capacitors are connected to the wires in the last picture. You can actually see that from the second picture. I'm sure they are just too big to fit next to the op-amp. Red wires are '+' side.

post #3 of 35
Thread Starter 

So I strip back a but of the sheathing and solder the capacitors just above where they come out of the black thingy (to use a technical term!)

post #4 of 35

Hmm....that looks like a very unprofessional PCB build......

 

EDIT: I mean the PCB itself, not the soldering job....sorry.

post #5 of 35
Thread Starter 

I have made mine so it now looks like the one in the picture. What I am now stuck at is

 

 - the wires to the batteries, they seem to go via something else marked SW on the diagram

 

- I have on/off switch which appears to have no place to go on the circuit board

 

Is SW the on/off switch?

 

Then, there are red and black wires marked on the diagram and then a gray one that goes from a battery negative terminal straight to the circuit board. So in the actual picture are the read and black wires going to the switch and the green one going going straight to the battery? The kit does not come with a green wire, only black and red ones.

 

Thanks again.

post #6 of 35

The on/off switch is not mounted to the board, you have to find some place to put it on your own.

Yes, SW refers to the switch.

 

The red wire from the first battery goes to the + spot on the board.

The black wire from the first battery goes to the switch.

The red wire from the second battery goes to the switch.

The black wire from the second battery goes to the - spot on the board.

 

Just think of the gray/green wires as really being black 

post #7 of 35
Thread Starter 

Much obliged Avro_Arrow

post #8 of 35
Thread Starter 

Well, I followed the instructions as best as I could, but two problems

 

- the LED does not light up

 

- which is possibly connected to when I switch on, all I get is a seconds worth of music and then it stops.

 

Suggestions welcome.

post #9 of 35

LED may be mounted backwards?

 

Is this the problem...Listening to headphones, turn on amp, sound plays then stops?

Maybe one or both of the batteries are depleted?

 

Sometimes the most obvious problems....

 

Can you check for voltages? 

post #10 of 35
Thread Starter 

The problem is exactly how you describe it. The batteries are brand new. I have a meter, but no real knowledge of how it works, I just use the continuity part to check cables I have made, but I will have a go. I do not think it matters what way round the LED goes, there is not difference either way.

 

The picture above I did use has one resistor the other way round from all of the others (the three in a row, the one on the left) would that matter?

post #11 of 35
Thread Starter 

Hopefully this picture will help.....

 

    4929779828_08ef748bbd_b.jpg

 

One last question, does it matter which way round the Opamp goes?

post #12 of 35
Quote:
Originally Posted by Prog Rock Man View Post

Hopefully this picture will help.....

 

[snip]

 

One last question, does it matter which way round the Opamp goes?


yes, opamp orientation is important - there should be a dot at the corner or a notch at the top of the opamp, that denotes pin 1. make sure your opamp's orientation is the same as in the "supposedly completed" pic you have above.

 

Also, LED orientation should matter - LEDs are not bipolar, they only work in one direction. I don't think this should cause any problems other than the LED not lighting up, though.

post #13 of 35
Thread Starter 

The LED has been switched round and shines bright. The orientation of the opamp is the same as the top picture and now.....nothing, no sound at all.

 

EDIT - I have compared the photo of the soldering from below on the ebay site and it looks identical to mine.


Edited by Prog Rock Man - 8/26/10 at 11:12am
post #14 of 35

If you have had the Op Amp mounted backwards it may now be blown.

 

As was mentioned above, you have to be careful about the orientation

when mounting them. There will always be some kind of mark to show

where pin 1 is and there should also be a mark on the board to show

where pin 1 goes. IC sockets also have a mark at one end to indicate

pin 1. It is important to make sure you always know where pin 1 is.

 

I didn't see anything in your picture that jumped out at me as being wrong.

Can you take another picture that shows the wiring at the switch better?

post #15 of 35
Thread Starter 

I have had a problem with the wiring as the wire is so thin, I think I have a connection and then it comes apart. A mate who has more soldering experience is hopefully going to look at it tomorrow. I may have also blown the opamp as I did have it fitted the wrong way round.

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