Re: Problem with 74ac74
- --- In firstname.lastname@example.org, "Alan" <alan4alan@...> wrote:
>Hi alan thx for the quick reply..
> ----- Original Message -----
> From: "tinus12342" <tinus12342@...>
> > http://yfrog.com/h3f28sp
> > it's a picture of the si570 software
> It seems to show the Si570 is working but it does not prove that the signal is actually there.
> If the signal is there it may not be reaching U6. (T1 and components.)
> Carefully try connecting pin 3 (hairpin of R11) of U6 to ground, 0V, and then to 5V.
> The outputs, pin 6 and 8 should change from 0 to 5V as you change the connection to R11.
> If this happens then it will show U6 is working.
> 73 Alan G4ZFQ
I found the problem.. the pad of pin 3 was half broken of the board.. maybee because i have soldered the 74ac pads too much..
but i have hard wired pin number 3 :) and my voltages readings are now..
pin 1: 5.07V
pin 2: 2.2 V
pin 3: 2.5 V
pin 4: 5.04 V
pin 5: 2.2 V
pin 6: 2.2 V
pin 7: 0 gnd
pin 8: 2.22 V
pin 9: 2.21 V
pin 10: 5.04 V
pin 11: 2.51 V
pin 12: 2.2 V
pin 13: 5.03 V
pin 14: 5.05 V
I think this solved the problem with the 74ac74 :)
Altough there is not comming any sound out of the softrock so maybee i have some questions later on..
For now many thanks alan!