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Hi, ericgibbs,
Thanks again. So here's your idea: Control.pdf.
First: I couldn't find 74LS25 so I changed it with SN74HC4002 (again dual
4-input positive NOR gate).
Second: At the triggers' outputs you see "Port#". I'm placing a buffer
(SN74LS541N - Octal Buffer and Line Driver with 3-State Outputs) on each
of the outputs. So that I can send positive impulses to as many switches
as I want. In my case: the greates amount is 4 (MAX333). On each of
the switch inputs there's a pull-down resistor tied to GND.
What's you opinion?
My bad. I'll fix that up.
Is there a way I can send you "the whole picture"? May be e-mail?
So ... there it is: switch.zip
Feel free to ask whatever you think of.
Yah. As I was looking the drawings this morning I realised that the PCB is
going to be at least with two layers. Even if I use SMD components, it's
going to be again two layers at least.
Do you have any comments or sujestions on the other sheets? Something
missed by me that you've spotted? Wrong connections? Anything.
Hi, ericgibbs,
While we were discussing the control unit I missed telling you (my bad again)
that I might (and certainly will) need a "RESET" button. I didn't mention that
part, did I. The idea is whenever pressed this button will set the switch
in "straight-trough" mode where every input port responds to its output one.
The other tiny detail I didn't metion too is the buzzer. When pressing a
button a short beep is produced. Just as some kind of (sound) indication.
Here's the switch board :
Sorry about the stupid question, but I just want to be sure I understand what
you've drawn. So SN74HCT14N is a Hex-Schmitt-Trigger Inverter right?
The other thing is a diode, may be. But I am not sure because I can't
see it right. But I think you've placed a diode (1N4007 for example)
right between pin 2 and pin 3; anode goes to 2, cathode goes to 3?