Tom Holmes wrote:
"I am curious about one part of the warmup process. At around 7 minutes,
the power jumps up radically, which you attribute to
the outer oven kicking in. It has often been stated on this list that
the outer oven was intended for use during really cold
starts, which I would
Hi
One would guess that they delay going “full power” so as not to hammer the
main power supply quite so hard at start up.
Bob
> On Jan 29, 2022, at 2:27 PM, Tom Holmes wrote:
>
> HI Ed & Ed...
>
> Thanks for the plot. The dive towards zero just before the spike s
> surprising; maybe a
I endorse Dave's suggestion (below) .
The resistive divider is simple but slows down the edge rate which may
be undesirable especially if the input isnt a schmitt.
The MOSFET solution is the most appropriate. take a look what is inside
packaged translators... just that.
On 29/01/2022 10:33
Those diodes are so robust that a PIC connected the wrong way to a 5V 1 Amp
PSU was protected by all these diodes conducting in parallel and current
limiting the PSU. The PIC appeared to have survived (although I chucked
it anyway, just in case)
Andy
www.g4jnt.com
On Sat, 29 Jan 2022 at
HI Ed & Ed...
Thanks for the plot. The dive towards zero just before the spike s surprising;
maybe a funky data point?
Anyway, I'm not doubting that the observations are correct, just curious about
the timing and source of that power spike. Like maybe the controller decided it
wasn't heating
On 2022-01-29 2:30 AM, "Tom Holmes" wrote:
Ed...
Very good data!
I am curious about one part of the warmup process. At around 7 minutes, the
power jumps up radically, which you attribute to
the outer oven kicking in. It has often been stated on this list that the outer
oven was intended for
You can run the PicDiv on 3.3 V and connect the 5V signal to the PicDiv input
via a series resistor between 1k and 10k. Put the resistor at the PicDiv end of
the connection.
The PIC has protection diodes on it's input These clamp the input to the
supply. The series resisor limits the current.
You can actually use a single small N channel MOSFET (2N7000 or similar)
with it's Gate connected to the lower Vcc via, say, a 1k resistor. (Not
strictly needed, but with long leads, it helps prevent HF transient
oscillation.
Then use it's Source as the lower voltage data line, and it's
On 28/01/2022 19:41, folkert wrote:
Hi,
[]
The RPI doesn't like 5v on its GPIO pins.
So I wonder:
- can I feed the picdiv 5v on its GPIO pin while giving it a 3.3v
voltage so that it outputs 3.3v as well to the rpi pins?
- or should I use a voltage divider? I was thinking of a 4.7k ohm and
