I don't have the board, schematics, or software in front of
me, but I think that Myke eliminated the RC section
and is using the internal PC clock for timing now.  The latest
version of the software might not be doing anything with the
parallel port signals used for timing.

Karl


Quoting jferrero <jferrero@UNSJ.EDU.AR>:

> Hello respectable list,
>
> I have done a serch on the pic-list archive, but I did4nt found my
> problem
> there:
>
> First, I must say that I built my cheapo on the Myke4s book PCB, and
> tried
> it with the CD software and also with the last windows interface
> downloaded
> from Myke4s web site. -PC PII 266 Mhz W95-
> I have done the corrections to the scheme (3906 error) and the PCB
> (2N7007
> error). Also I have made a new Cheapo on a breadboard, but I always have
> the
> same results:
>
> Step 2:    15,66 V  (OK)
> Step 3:    13,10 V  (OK)
> Step 4:    5,01 V   (OK)
>
> Step 5:    High: 4,99 V  (OK); Low: "Build test error: RC Delay Line did
> not
> return a low voltage value as expected" although for two seconds the
> DMM
> indicates 1,5 V, then 4,99 again.
>
> Step 6:    High: 4,92 V (OK); Low: "Build test error: RC Delay Line did
> not
> return a low voltage value as expected" although for two seconds the
> DMM
> indicates 3,36 V, then 4,92 again.
> Checked the diode CR5 position, solders continuity; also checked R3/R4
> resistance and C3 capacitance values, etc
>
> Step 7:    High: 4,92 V; Low: 0,01 V (OK)
> Step 8:    High: 13,31 V; Low: 0,18 V (OK)
> Step 9:    High 12,99; Low: 0,01 V (OK)
>
> Does anybody has experienced this problems?
>
> Thank you in advance!
>
> Jorge Ferrero
>
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>
>

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