Hi, I am attaching a schematic below for a time which which just counts up to 99 automatically one the SW2 is enabled. The speed of the timer is adjustable via VR1. The SW2 starts/stops the timer, SW1 resets the timer back to 00 and SW3 enable the decimal point so instead of 11, it would be 1.1. I have used the IC4093B NAND Gates as my tone generator so the timer beeps every second.
Is it possible if I can achieve this following result following on from the schematic I have attached?
The result I would like to achieve is that, if I add another potentiometer, I can change how many seconds I would like for countdown. So for example, I would like a player to have 30 seconds, I change the potentiometer manually to display 30 seconds on the Dual 7 segment display (Like shown in the attachment), and once I press the push to make switch (I can add another one in the circuit) the countdown starts. Now, I am not sure whether it will countdown backwards like 30...29...28 using the IC4026B in the schematic or if possible, it will reset to 00 and then automatically countdown from 00 to 30 upwards. But any of these two are preferable. Thank You.
Here is a video I found on YouTube that has a very similar function but I don't want to use Arduino or any programming stuff as I am not allowed:- http://www.youtube.com/watch?v=THymuZU9Zsw
The credits of this schematic goes to ScottWang and Sheldons as I had major help building up the schematic above -
Is it possible if I can achieve this following result following on from the schematic I have attached?
The result I would like to achieve is that, if I add another potentiometer, I can change how many seconds I would like for countdown. So for example, I would like a player to have 30 seconds, I change the potentiometer manually to display 30 seconds on the Dual 7 segment display (Like shown in the attachment), and once I press the push to make switch (I can add another one in the circuit) the countdown starts. Now, I am not sure whether it will countdown backwards like 30...29...28 using the IC4026B in the schematic or if possible, it will reset to 00 and then automatically countdown from 00 to 30 upwards. But any of these two are preferable. Thank You.
Here is a video I found on YouTube that has a very similar function but I don't want to use Arduino or any programming stuff as I am not allowed:- http://www.youtube.com/watch?v=THymuZU9Zsw
The credits of this schematic goes to ScottWang and Sheldons as I had major help building up the schematic above -
the 4026 requires a hi going reset so try this simple circuit -no switch needed
Now you had two tone generators and they connected together, the one is NE555, and the other is CD4093, actually you just need any one of them.
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