ther-man

[Paul Maddox]

Elliot,

>2)  Don't use a CMOS version of the 4049.  9 volts will blow the chip.
>	CMOS likes a steady 5 volt supply.

Huh?
CMOS will take upto 15v... TTL wont take more than 5v...

>3)  DO NOT SOLDER anything without building it on a breadboard first.
yep, its how I do my designs, it allows for bits to get fried/ wireing to be 
changed and values to be gotten right without constant resoldering... Then I 
breadboard it, then I do a PCB (unless its really complex, like the digial 
part of my PPGVCO, too mnay wires to get my head round).

>4)  If you are new to this game, it is VERY easy to miscount the pins on
>	a chip, especially if you are dealing with chips with different
>	numbers of pins.  Check your pins.  1 in the top left, 8 at bottom
>	left, 9 at bottom right, and 16 at top right.  I miswired so many
>	chips, I began to wonder if I could count to 16 without taking my
>	shoes off.
>

one is not always top left... depend if you have the chip upside down :-) 
seriously.. look at the chip, there are two ways of identifing the 'top' of 
the chip or pin 1.
If it has a notch at one end of the chip, this is the top ,as you look at 
it, writing side up. Pin1 is the topmost pin on left hand side of the chip.
If it has a dot, this indicates pin1, its usually located off ceneter so as 
to distinguish between pin 1 and pin8(16/24/whatever).

Just my little bit of advice....

Paul Maddox



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