Hi I'm building a basic 4-step sequencer that needs to generate a CV and Gate signal. The Gate should be a 50ms pulse at +5V and the CV should be between 0 and 5V. I've come up with the following circuit using various resources online, however, when building it I actually ran into a problem, the pulse shaper fails because the 4017 doesn't go low long enough to retrigger the one-shot.
The circuit works like this: a 555 (IC1) clocks a 4017 divider (IC2) which divides the frequency. The 0 output of that divider is fed as the clock to another 4017 (IC5) which sequences the four channels. The channel outputs go through 4 switches and each switch is bussed into a 555 one-shot (IC3) to shape the pulse into a 50ms burst. But as I said the last part isn't working. Does anyone have any tips on how to make these short bursts from a 4017 in a better way? I thought this would work since its possible to clock a 4017 from another 4017 but it seems the 555 trigger is not picking up the low gap in between sequencer steps and just reads the gate as always high...
The circuit works like this: a 555 (IC1) clocks a 4017 divider (IC2) which divides the frequency. The 0 output of that divider is fed as the clock to another 4017 (IC5) which sequences the four channels. The channel outputs go through 4 switches and each switch is bussed into a 555 one-shot (IC3) to shape the pulse into a 50ms burst. But as I said the last part isn't working. Does anyone have any tips on how to make these short bursts from a 4017 in a better way? I thought this would work since its possible to clock a 4017 from another 4017 but it seems the 555 trigger is not picking up the low gap in between sequencer steps and just reads the gate as always high...
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