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Operating Systems OS X (Apple) The Alternate DC board for AudioScope.sh. Post 302947884 by wisecracker on Tuesday 23rd of June 2015 02:28:20 PM
Old 06-23-2015
The Alternate DC board for AudioScope.sh.

Hi guys...

Well I have entered an area of partial insnity... ;o)
Below is a photo of the 'ALTDC' board for AudioScope.sh...

I have decided to incorporate all three methods for obtaining DC into this MBP via the MIC input.

1) VFO.
2) CHOPPER.
3) COUNTER.

The controller for the COUNTER is not yet done but this board can now do 1) and 2).

I have started properly coding for the VFO section first but and I have decided just to do an accuracy of 4 bit depth for this. That is 0 - +2V to an accuracy of 0.125V.

I have an example basic piece of code that checks ranges of values so as to create each of the 16 values possible. The problem is it is ugly and 16 conditional "if"s is not the way to go. Again I can't find any info how to create a look up table where each lookup is a range of values. The EXAMPLE code below DOES work mighty fine but looks so ugly and primitive.

Any other ideas guys?
Code:
#!/bin/bash
# lookup
while true
do
	read -p "Number, 100 to 499:- " num
	if [ $num -ge 100 ] && [ $num -le 199 ]
	then
		echo "1) $num"
	fi
	if [ $num -ge 200 ] && [ $num -le 299 ]
	then
		echo "2) $num"
	fi
	if [ $num -ge 300 ] && [ $num -le 399 ]
	then
		echo "3) $num"
	fi
	if [ $num -ge 400 ] && [ $num -le 499 ]
	then
		echo "4) $num"
	fi
done

This simulates 2 bit depth but looks SOOO ugly...

Now the photo...
Top Left:
The CHOPPER with the option of the diode DC offset removing the blue link.

Bottom Left:
The 9V PP3 input to 5.1V supply.

Middle:
4 transistor VFO used for the first part of the DC code.

Top Right:
The VFO test circuit using the two black links connected and transistor input for measurement when links disconnected.

Bottom Right:
3 terminals, top terminal multivibrator output for 3) and for detection.
Middle terminal for the DC input.
Bottom terminal is one of the ground terminals.
To keep this simple it took some working out...

Enjoy. Bazza...
The Alternate DC board for AudioScope.sh.-dc2jpg
 

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BACKGAMMON(6)							 BSD Games Manual						     BACKGAMMON(6)

NAME
backgammon -- the game of backgammon SYNOPSIS
backgammon [-] [-nrwb] [-pr] [-pw] [-pb] [-t term] [-s file] DESCRIPTION
This program lets you play backgammon against the computer or against a "friend". All commands are only one letter, so you don't need to type a carriage return, except at the end of a move. The program is mostly self-explanatory, so that a question mark (?) will usually get some help. If you answer `y' when the program asks if you want the rules, you will get text explaining the rules of the game, some hints on strategy, instructions on how to use the program, and a tutorial consisting of a practice game against the computer. A description of how to use the program can be obtained by answering `y' when it asks if you want instructions. The possible arguments for backgammon (most are unnecessary but some are very convenient) consist of: -n don't ask for rules or instructions -r player is red (implies n) -w player is white (implies n) -b two players, red and white (implies n) -pr print the board before red's turn -pw print the board before white's turn -pb print the board before both player's turn -t term terminal is type term, uses /usr/share/misc/termcap -s file recover previously saved game from file Any unrecognized arguments are ignored. An argument of a lone `-' gets a description of possible arguments. If term has capabilities for direct cursor movement (see termcap(5)) backgammon ``fixes'' the board after each move, so the board does not need to be reprinted, unless the screen suffers some horrendous malady. Also, any `p' option will be ignored. (The `t' option is not neces- sary unless the terminal type does not match the entry in the /usr/share/misc/termcap data base.) QUICK REFERENCE
When the program prompts by typing only your color, type a space or carriage return to roll, or d to double p to print the board q to quit s to save the game for later When the program prompts with 'Move:', type p to print the board q to quit s to save the game or a move, which is a sequence of s-f move from s to f s/r move one man on s the roll r separated by commas or spaces and ending with a newline. Available abbreviations are s-f1-f2 means s-f1,f1-f2 s/r1r2 means s/r1,s/r2 Use b for bar and h for home, or 0 or 25 as appropriate. FILES
/usr/games/teachgammon rules and tutorial /usr/share/misc/termcap terminal capabilities AUTHORS
Alan Char BUGS
The program's strategy needs much work. BSD
May 31, 1993 BSD
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