On Mon, 2008-04-28 at 21:47 -0400, Kenneth Lerman wrote:
> Does anyone use a single chip solution consisting of a single 8 pin
> microprocessor?
>
> An Atmel atTiny13 is $1.40 in an 8 pin dip package. These chips power up
> nicely, require no external oscillator, and are easy to program. If you
On Mon, 2008-04-28 at 21:08 -0400, John Kasunich wrote:
... snip
> After I wrote my reply I looked closer at the schematic and saw the how
> big your caps are. I also noticed that you are using an LS14. I used
> much smaller caps, probably 0.1uF for the filter and 0.01uF or smaller
> for the pump
On Mon, 2008-04-28 at 21:07 -0400, Greg Michalski wrote:
... snip
> improve it please feel free to post :) ) Are you running that directly off
> a parallel port pin or is it buffered/opto-isolated?
...snip
My charge pump is being feed by a parallel port buffer which is a
54HCT541. There isn't m
a failure of the failsafe circuit be undetected.
Ken
- Original Message -
From: "John Kasunich" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)"
Sent: Monday, April 28, 2008 9:11 PM
Subject: Re: [Emc-users] Watchdogs
> Greg Michalski wrote:
>
Greg Michalski wrote:
>
> So in order to get my CNC4PC charge pump board to work correctly (it relies
> on a 12.5kHz constant signal) I am going to need to create it's own thread
> in addition to the servo thread and the base thread? I am thinking this is
> possible to do, are there any negat
Kirk Wallace wrote:
> On Mon, 2008-04-28 at 19:54 -0400, John Kasunich wrote:
> ... snip
>> Using a schmidt trigger to clean up the output is good. However, there
>> is one potential problem. The two stage charge pump can produce more
>> than 5V, which the '14 might not like. Maybe a clamp diode
> Here is what I breadboarded that seems to work.
> http://www.wallacecompany.com/machine_shop/Shizuoka/watchdog-1b.png
That looks nice and simple. If I have troubles with what I've got on hand
(the CNC4PC charge pump board) I might try your circuit out. (So if you
improve it please feel free t
On Mon, 2008-04-28 at 19:54 -0400, John Kasunich wrote:
... snip
> Using a schmidt trigger to clean up the output is good. However, there
> is one potential problem. The two stage charge pump can produce more
> than 5V, which the '14 might not like. Maybe a clamp diode to the
> supply rail? Or
Kirk Wallace wrote:
> Here is what I breadboarded that seems to work.
>
> http://www.wallacecompany.com/machine_shop/Shizuoka/watchdog-1b.png
>
> I used John's circuit and added the two inverters to the output because
> the EMI from the mechanical relay engaging would cycle the solid-state
> rel
Here is what I breadboarded that seems to work.
http://www.wallacecompany.com/machine_shop/Shizuoka/watchdog-1b.png
I used John's circuit and added the two inverters to the output because
the EMI from the mechanical relay engaging would cycle the solid-state
relay which would cycle the mechanica
On Fri, 2008-04-25 at 23:17 -0400, John Kasunich wrote:
> Kirk Wallace wrote:
... snip
> > If the input is constantly high, the signal to the FET will be the division
> > of
> > R2 and R5?
Dooh. It's as plain as day that R2 is grounded. Somehow I visualized
current going through R2, the diodes, R
Kirk Wallace wrote:
>
> I guess I need a little more help than I thought. Here is my first pass
> at your board schematic:
>
> http://www.wallacecompany.com/machine_shop/Shizuoka/watchdog-1a.png
That looks correct.
> I guessed at the FET array pins and some bits are missing but I think I
> got
On Fri, 2008-04-25 at 17:02 -0400, John Kasunich wrote:
... snip
> exactly right. I do know it is over 5V, enough to nicely saturate a
> logic level FET, and would probably do OK with a normal FET.
>
> If you need more details don't hesitate to ask.
>
> Regards,
>
> John Kasunich
I guess I ne
Kirk Wallace wrote:
> On Fri, 2008-04-25 at 11:47 -0400, John Kasunich wrote:
> ... snip
>> That HAL component makes the charge pump signal. I think Kirk is
>> looking for the real circuit that uses the charge pump signal to turn on
>> a relay.
>
> Thats correct.
>
>> I built one for my Shopta
On Fri, 2008-04-25 at 11:47 -0400, John Kasunich wrote:
... snip
> That HAL component makes the charge pump signal. I think Kirk is
> looking for the real circuit that uses the charge pump signal to turn on
> a relay.
Thats correct.
> I built one for my Shoptask, unfortunately I think I just d
Chris Radek wrote:
> On Fri, Apr 25, 2008 at 07:47:32AM -0700, Kirk Wallace wrote:
>> I have every thing controlled by parport pins on my Shizuoka which makes
>> for an inexpensive conversion, but one of the problems is that if I have
>> my main breaker on while booting the EMC2 PC the mill will co
On Fri, Apr 25, 2008 at 07:47:32AM -0700, Kirk Wallace wrote:
> I have every thing controlled by parport pins on my Shizuoka which makes
> for an inexpensive conversion, but one of the problems is that if I have
> my main breaker on while booting the EMC2 PC the mill will come up in an
> unsafe sta
I have every thing controlled by parport pins on my Shizuoka which makes
for an inexpensive conversion, but one of the problems is that if I have
my main breaker on while booting the EMC2 PC the mill will come up in an
unsafe state. One of the solutions I was thinking about is, I seem to
recall a w
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