CHAPTER 10 - CONSOLE TIMER
Now that the two clocks are finished, let's move on to the TIMER.
It is the easiest to build.
We decided on ONE board for this timer that will go inside the console itself.
We also decided on smaller Seven Segment Displays (.54" vs the 1" we used on the clocks.)
There is no need for a controller, as all we will be doing is re-setting the timer to 00:00:00 and let it count.
For a reset, our console module will provide a "HIGH" when ever you push the Channel Button. (More on this later).
So here is the diagram for the Timer.
The timer is re-set via a relay that closes when it receives a 'high' (1) from the console. The relay contact goes though 4 diodes that will feed a momentary +5 V to the re-set pins.
Easy Peazy. Bob's your uncle.
You build this the same way that you made the Clocks. Place the components, run the busses, and then wire it up.
Don't forget to TEST as you go along.
Everything 'should' work as designed. If so, let's go ahead and order the circuit board from JLC Pro.
Here is the blank board we got.
When that is verified as working, move onto the seconds section, then the minutes.
We will now set this aside, and forge ahead.
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Some final thoughts on the clock/timer.
It was hard to get it to come together, but well worth the effort.
Yes, I could have used a PIC/PUC or whatever they are called. Or an Arduino. Or even a programmable chip.
But I love CMOS and I am an old fart.
I ran into on LARGE issues with the finished board. When I hit the "reset", all the digits returned to 'zero" EXCEPT for the 'minutes' digit. It would always land on "1".
So I went back to the bread board to see if I could figure it out. For some reason, adding a resistor to the output of the 4018 solved the issue. I also added a couple of diodes. (The schematics and pictures do MATCH the fixed version.
And yes, I had a few failures and changes in the designs.
But now I have 2 digital clocks in my Ham Shack. (one set to GMT, the other set to LOCAL time)
And a timer for the console.
I learned and relearned a lot of things doing this phase.
But I am glad it's over.
I hope you got as much out of it as I.
So now we have our clocks and timer completed and "running like a clock', we will move on.
It's time to check the clock and timer off of our Planning List.
MIXER PLANNING
1) POWER SUPPLIES
+/- 15 VDC XMFR 1
+/- 7.5 V DC XMFR 1
+ 5.0 VDC (CLOCK/TIMERS) XMFR 2 OR COMMERICAL UNIT
SCHEMATICS
CIR BOARDS
CABINET
2) TIMER / CLOCK - SEPERATE UNITS FROM MIXER DUE TO SPACE LIMITS
12 HOUR MOD 60 MOD 60 MOD 12
24 HOUR MOD 60 MOD 60 MOD 23
TIMER UNIT
RE-SET PANEL
DISPLAY BOARD SCHEMATIC CIR BOARD
MAIN BOARD SCHEMATIC CIR BOARD
60 SEC/MIN MOD SCHEMATIC CIR BOARD
23 HOUR MOD SCHEMATIC CIR BOARD
12 HOUR MOD SCHEMATIC CIR BOARD
CABINET
PROTO TYPE
FINAL
3) HEADPHONE AMPLIFIER
DESIGN
SCHEMATIC
PROTO TYPE
CIRCUIT BOARD
4) CUE AMPLIFIER
CAN ALSO USE AS A TEST AMP WHILE BUILDING AUDIO BOARDS
DESIGN
SCHEMATICS
PROTO TYPE
CIRCUIT BOARDS
5) POWER AMPLIFIER (REPLACES TASCAM PA-30)
DESIGN
SCHEMATICS
PROTO TYPE
CIRCUIT BOARDS
6) OUTPUT BOARD
DESIGN
SCHEMATICS
PROTO TYPE
CIRCUIT BOARDS
7) MONITOR SELECT
DESIGN
AVOID OLD STYLE SWITCHES, USE DIGITAL
SCHEMATIC
PROTO TYPE
CIR. BOARD
8) PGM / AUD / MONO SELECT
DESIGN
AVOID OLD STYLE SWITCHES, USE DIGITAL
SCHEMATIC
PROTO TYPE
CIR. BOARD
9) INPUT SELECT
DESIGN
AVOID OLD STYLE SWITCHES, USE DIGITAL
SCHEMATIC
PROTO TYPE
CIR. BOARD
10) AUDIO INPUT BOARD
DESIGN
RS-12 VERSION
SCHEMATIC
PROTO TYPE - NOT DOING A PROTO TYPE
CIR. BOARD
11) MONITOR BOARD
DESIGN BASED ON MONITOR SELECT DESIGN
SCHEMATIC
PROTO TYPE
CIR. BOARD
12) EXTERNAL MONITOR BOARD
DESIGN
SCHEMATIC
PROTO TYPE
CIR BOARD
13) VU METER BOARD - SEPERATE UNIT ON SHELF
ONLY USED BECAUSE IT IS ALREADY BUILT
14) LED METERING - ON BOARD
USE RS-12 CIRCUIT REG LED'S OR BAR GRAPHS ????
SCHEMATICS
PROTO TYPE
CIRCUIT BOARD
15) D.A. AMPLIFIER
DESIGN
SCHEMATIC
PROTO TYPE
CIR BOARD
16) 4 PORT EXPANDER BOARD
DESIGN
SCHEMATIC
PROTO TYPE
CIR BOARD
17) POWER SUPPLY DISTRIBUTION BOARD ??
MAY BE NEEDED WITH MULTIPLE BOARDS ??
YEAH, Number 2 is completed !!!!!!
Coming up next on "Let's Build An Audio Console"-------- We were going to do an Audio Amplifier next, but changed our minds.
I think we may move onto the audio INPUT cards and a way to feed 4 stereo inputs into ONE Input.
Hope you come along.
God Speed, Mother Nature.
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