ljcox said:
Alex,
Here is a starting point for you. It can count down from 99 to 0. If you need more help, let me know
Len
For the 4029, would a Texas Instruments CD4029BE fit the bill?
For the 4001, I'm looking at the TI CD4001UBE
For the 4002, I'm looking at the TI CD4002BE
For the 4011, I'm looking at the Fairchild Semiconductor CD4011BCN
For the one minute timer, should I use a 555? or is there a better way?
For a 555, I'm looking at the TI NE555P. I'm seeing what else Digikey has.
For the Thumb switches, I'm actually going to use ITT Industries - RTE1001N13's. Low Profile Rotary Dip Switches (with Extended Shaft)
So far that is as follows
Code:
# QTY $ (each)
1 6 296-2046-5-ND IC PRESET UP/DWN COUNTER 16-DIP (0.46) $2.76
2 2 296-14077-5-ND IC QUAD 2-IN NOR GATE 14-DIP (0.46) $0.92
3 2 296-2029-5-ND IC DUAL 4-IN NOR GATE 14-DIP (0.46) $0.92
4 2 CD4011BCN-ND IC GATE NAND BUFF QD 2INP 14-DIP (0.41) $0.82
5 2 401-1032-5-ND SWITCH ROTARY 10POS BCD SHAFT (2.91) $5.82
All for a grand total of $12 (+ S/H and Tax)
I'm buying extra counters because I'm thinking about doing seconds also and then putting in an LCD.
You've been a great help, thanks. (If you see that I am using the wrong chip, please let me know!!)