Uhhg....the parts for my El-Cheapo should arrive today. Haris, what
design did you go with after giving up on the El-Cheapo?

Thanks,
Steve Ruse

> I also built the EL-Cheapo and I was very disappointed. I had the same
> problems and I have changed the components 2 times just to be sure.
This
> circuit seems to be very depended on the PC's parallel port, even the
author
> bought a special port for his computer! Also I came to many different
> circuit diagrams when I have done a search in the internet for the
> El-cheapo. This in my opinion is a very unreliable design and
unprofessional
> to put it as a pcb in book because many people is going to spend time
and
> money to built it. It was better to include some more components and
make a
> more reliable design.
>
> The solution for me was to move on and built another programmer that a
> colleague suggested to me, which worked at once without problems.
>
> Haris
>
>
>
> ----- Original Message -----
> From: "jferrero" <jferrero@UNSJ.EDU.AR>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Tuesday, October 09, 2001 14:15
> Subject: [PIC]:El Cheapo programmer help needed
>
>
> > 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
> >
> > --
> > http://www.piclist.com hint: PICList Posts must start with ONE
topic:
> > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: -
>Ads
> >
> >
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>
>
>

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads