Hello,
Thank you Bill. Ok for this additional information for the chopper.
I dare to ask one more thing (the last? i can not promise...
) .
I was again studying your website:
the part concerning
the video control of the core of the Argus 3http://www.fire-tics.co.uk/project3/index.htmIf i summarize well (not sure....), i understand the following:
- For people who wants to buy one of your spare core, you would reset the core for setting it in a kind of "fixed or automatic brightness and contrast control", which would allow to use the core in a stand-alone mode by itself, independently of any external informatic interface, for a DIY project ("Videoput/power in").
I suppose that for preparing the core in this sense, you will proceed following the idea given in the
green frame (in combination with your notice to be read in the
purple frame.
But,
- I see that there would be also a possibility to acquire a kind of "manual" control of the brightness and contrast by using potentiometers to be added.
such configuration allowing to obtain this control without using the RS232 port and any computer, external microcontroller, whatever...
See your teaching coming from the
red underlined text in combination with the
blue underlined text and frame.
I would like to know a bit more on this second point:
- what do you concretely mean by:
"
Disconnet the DAC and set up DC control level externally via pots. See test points "gn" and "os". "
What i can imagine is that the idea is to substitute the analog signals normally delivered by the DAC (fed by the digital control signals produced by the computer), by analog voltages directly applied to specific input on the PCB of the core, while bypassing/disabling the DAC.... But:
- at which points (something related to "gn" and "os" i guess ? (one pot between "gn" and ground, one other pot between "os" and ground, other configurations?)
- what value of potentioneters, which voltage span, origin?
Sorry again for all these questions, but as you guess, i consider to contact you for buying one of your core in the "near future"..... i try to have a basic but correct understanding for my next project and would like to do things properly....
Thank you again.
Best regards.
Stéphane