Programmers and emulators

[Bob Valentine]

I'd put a regulator in the power supply or on the input just to protect
against any spikes or overvoltage inputs, given that they're so sensitive.  

A LM7808 regulator will would work with no additional passive components if
the PP will run on 8 volts.   Otherwise, use a LM317 with two resistors to
set it exactly at 9 volts.   Data sheets are at National Semiconductor.

-> Bob Valentine
-> bob at tecmark.com

At 06:28 PM 2/28/2001 -0800, you wrote:
>someone on another list was mentioning this power problem & one of the techs
>that works @ Xtronics got on & said that this was not an abnormal thing.
>
>the question was "Just for kicks I checked the AC adapter and it supposed to
>convert it to 9VDC; however when I plugged it in and checked it with my
>Fluke it read 12.9VDC. Is yours like this also?"
>the answer was "The high voltage is normal - it is 9Vdc at the full 300mA
>load"
>
>call them before you send it back.
>BW
>
>
>-----Original Message-----
>From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
>Of Drew Skinner
>Sent: Wednesday, February 28, 2001 10:08 AM
>To: gmecm at diy-efi.org
>Subject: Re: Programmers and emulators
>
>
>So the quick programming that everybody advertises is not a good thing? Is
>there a programmer that won't do this and is still affordable? My PP was
>doing weird things last week, buffer checksums before and after burns didn't
>match, then it wouldn't burn anything (EPROMs were still erased after a
>"burn") now the S/W pukes an error about "make sure power pack is
>connected". I have confirmed power is coming from the AC adapter, although a
>lot more volts than the 9VDC it says. I guess I'll box it up and shoot it
>back to Kansas let them figure it out. I really needed to make some target
>idle vs. temp changes too (cam doesn't like to idle @ 588rpm).
>
>Drew
>
>>>> marcho at flash.net 02/28 10:22 AM >>>
>> This idea of life span reminds of something else I was wondering
>> about.  Has anyone had bit errors in their EPROMs occur after X number of
>> months with the same chip?  (Hah!! Same chip for months you ask??)  The
>> programming algorithm that the PP uses is mighty quick compared to the
>> recommended method that the $7,000+ Data I/O unit here at work
>> uses.  Programming a 27C32 "by the book" on the Data I/O takes well over 1
>> minute.   The PP, about ~2 seconds.  Short cutting on the programming time
>> can lead to life span problems on the data contents within the eprom.
>
>I did have a chip that I made for somebody 6 months ago start acting up
>recently. It was a 2732A I think. Just out of the blue it started running
>terrible and check engine light came on. Put the stock chip in and
>everything was fine again. I burned a new chip for him, and it works fine.
>hmmmmm.... it was programmed with the PB-10 though, not a PP. But it did use
>the 'quick' programming algorithm.
>
>Craig M.
>
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