Hans keyboard splitter

[Hydro]

I made han's keyboard splitter and it will not work. i am very angry and am annoyed with it. any common problems, or things i could check? i get a keyboard error when i start my computer, and i use a keydetecting program and get nothing. thanks,

[JustMichael]

Do you have a keyboard connected to the splitter?  There are 2 different types of trasistors, did you get them in the right place?  Transistors and IC chips can be damaged by heat, did you take too long soldering them?  I recommend not soldering a chip but socket it instead.  Makes replacing the chip (if you ever need to) so much easier.

[Carsten Carlos]

yep, CMOS-IC's (the chip he used is a CMOS) are very sensisitive to electricstatics, so touching the pins with your hands can kill them, too - always touch yourself something grounded (metall of your PC e.g.) before you touch the pins. Using sockets is the best way if you are not to familiar with electronics.
Won't help to be angry though, at least it isn't Hans' fault that it doesn't work, as I'm very shure that the circuit he made works for him. Didn't you asked for what kind of chip some threads before? Maybe ask Hans about if you could use the chip you did!

Take care
Carsten

[Hydro]

yeah i double checked the chip, and used a socket. i pluged it in to the computer and the chip got pretty hot. i think i may have fried it. here is the one that i ordered
http://www.mouser.com/index.cfm?handler=productsearch._listproductsearch&precision=All&searchtype=starts+with&criteria=512-CD4053BCN&searchby=PartNumber&x=11&y=7
i am pretty sure that i got the right transistors. i will have to check them too. i did have the keyboard hooked up. sometimes my computer made a beeping noise when i plugged it in and then froze. other times, just didnt recognize it.
any other things i may have screwed up on?

[Carsten Carlos]

Hello over there,

I guess the chip you ordered should do it also but I'm not perfectly sure about this, plus you fried it anyway, so take this one:

http://www.mouser.com/index.cfm?handler=displayproduct&&lstdispproductid=571460

Same dealer, but this comes pretty near to the one that Hans used. Sorry to ask, but you did put the chip in the right direction? (the oval sign in it points to the end where PIN1 is located) I wonder 'cause it has got so hot, there must be some kind of mistake in your layout for that. Better check also if the transistors C,B,E are connected rightly, too. If they are different types then he used, be sure to get some sheet which shows were each one is located. Unfortunately this differs from transistor to transistor.

[Hydro]

ok i see the point about the chip. i will order the new one. is it possible that i may have fried anything else? i did take it to radio shack and had a guy check it out for me. from what we both saw it was wired the right way. could it just be the circuit? and or, could i have fried something prior to while soldering or from previous testing?

[Hydro]

one more thing, ca you tell me the kind of tranistors from mouser.com to order, because i might have messed those up too i guess.

[Carsten Carlos]

is it possible that i may have fried anything else?

Possible always, at least when you have misconnected the transistors. You know which of the transistor-pins is basis, collector, emitter? (I don't know it, but I guess your dealer has a book somewhere where he could get you a drawing for this) This can be different at the two different transistor types. The other parts should be stable enough, don't think that you've fried them, too.

I guess you got the right ones -but here we go (I've choosen those who were in stock ):
http://www.mouser.com/index.cfm?handler=displayproduct&&lstdispproductid=565378

http://www.mouser.com/index.cfm?handler=displayproduct&&lstdispproductid=562293

[hydro]

ok i will order more parts. one more quick thing, does anyone know the labels for the collector, base and emmiter on both the transistor itself, and the circuit? i think that is also a possible mistake.

[Carsten Carlos]

The easy part:

16                      9
I--------------------I
I D                      I
I--------------------I
1                       8

I think it was a 16pin chip? At least you find this mark on EVERY chip and so you know where the first pin is located. For the transistors, best is to ask your dealer!

[hydro]

One more thing, can someone show me the parts of the transistors on han's circuit? i am not sure if i messed that up
i think i did
but i have new transistors so i can fix it.
any comments?

[Carsten Carlos]

I'm not sure if this is what you are looking for, but if you need to know which pin in the circuit-drawing is B,C,E then you may compare it with this picture. http://www.mittelalterlicher-markt.de/arcade/images/LED-driver.gif

For the transistors itself, unfortunately these are different for each models, so I just don't know. Maybe this can be found online in some data-sheet/specific-sheet, but there wasn't one at mouser.com.
Don't rely on the small drawing to the right, this are the pins of a BC516, which can be different connected!