Hi, I need help understanding how a circuit works. The circuit below.
This is a Johnson counter made with a 74hc4015 shift register. I understand how the Johnson counter works. But this circuit is supposed to create a digital staircase sine wave. It is a digital sine wave generator.
What I don't understand is how the resistors at the different Q outputs which are all tied together play a role in the digital sine wave generation. I mean the resistors are not grounded. No current is flowing through them. What exactly do they do? If no current is flowing through the resistors its the same as not having them there at all, at least I always understood that to be the case.
I know the Johnson counter creates the following outputs at Q0-Q7.
00000000 10000000 11000000 11100000 11110000 11111000 11111100 11111110 11111111 01111111 00111111 00011111, and so on....
Each of these voltages will be around 3V or so. But what the heck do the resistors do?
Can someone help me out please. Thanks.
This is a Johnson counter made with a 74hc4015 shift register. I understand how the Johnson counter works. But this circuit is supposed to create a digital staircase sine wave. It is a digital sine wave generator.
What I don't understand is how the resistors at the different Q outputs which are all tied together play a role in the digital sine wave generation. I mean the resistors are not grounded. No current is flowing through them. What exactly do they do? If no current is flowing through the resistors its the same as not having them there at all, at least I always understood that to be the case.
I know the Johnson counter creates the following outputs at Q0-Q7.
00000000 10000000 11000000 11100000 11110000 11111000 11111100 11111110 11111111 01111111 00111111 00011111, and so on....
Each of these voltages will be around 3V or so. But what the heck do the resistors do?
Can someone help me out please. Thanks.
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