Hi all, I've been asking questions here on and off, but I'm finally undergoing a larger project combining a few things and figured I could use some help in the execution.
The circuit is a 10 step sequencer, on each step the circuit closes the switch to an audio play button on a small lo-fi digital recorder and the sound is played. It is a basic concept but I will also be adding in functionality to record to each recorder through one input and then have all signals mixed out through one output. The user can select from 3 timing options, 1) the internal 555 / tempo pot, 2) an external clock pulse, 3) a manual pulse button.
Right now I am working on the schematic that deals with the sequencing and playing of the sounds (the mixing of the output I will tackle once this is complete). It is almost a copy of the LED chaser circuit, but instead of just turning on the LED it uses an NPN transistor to close the switch of the audio circuit as well. There is also a manual switch so one can play each sample step by pressing a button. Furthermore the ten steps can be cut short to any number of beats via a switch at each step which sends a signal to the 4017 counter to reset, allowing for different timing bars.
I am posting a .pdf here I made out of LTSpice. The switch diagrams exported kind of weird with the text going vertical so look out for that and let me know if you see any problems that might crop up. Each aspect of the circuit I have tested independently, however I'm just not sure if they're all going to hook together as I intend.
The one thing I know is kind of janky is the Manual Pulse Generator, it's basically just a capacitor that charges up and when you hit a switch it sends a low-high charge over to the 4017, it seems to kind of work, but I know there must be a better way to do that.
I'll keep posting updates as I proceed. In the physical world, I'm still looking for a way to mount these tiny PC boards from the recorders onto a larger prototyping board. They have tiny screwholes but I need some kind of tiny L-bracket that I can then solder into the proto board. I just haven't found anywhere that sells miniature L-brackets oddly enough. Too small for home depot!
Oh yeah on the schematic, for the audio play circuits U1-10 are manual spst switches. D1-D10 are LEds U11-U20 are the reset switches.
The circuit is a 10 step sequencer, on each step the circuit closes the switch to an audio play button on a small lo-fi digital recorder and the sound is played. It is a basic concept but I will also be adding in functionality to record to each recorder through one input and then have all signals mixed out through one output. The user can select from 3 timing options, 1) the internal 555 / tempo pot, 2) an external clock pulse, 3) a manual pulse button.
Right now I am working on the schematic that deals with the sequencing and playing of the sounds (the mixing of the output I will tackle once this is complete). It is almost a copy of the LED chaser circuit, but instead of just turning on the LED it uses an NPN transistor to close the switch of the audio circuit as well. There is also a manual switch so one can play each sample step by pressing a button. Furthermore the ten steps can be cut short to any number of beats via a switch at each step which sends a signal to the 4017 counter to reset, allowing for different timing bars.
I am posting a .pdf here I made out of LTSpice. The switch diagrams exported kind of weird with the text going vertical so look out for that and let me know if you see any problems that might crop up. Each aspect of the circuit I have tested independently, however I'm just not sure if they're all going to hook together as I intend.
The one thing I know is kind of janky is the Manual Pulse Generator, it's basically just a capacitor that charges up and when you hit a switch it sends a low-high charge over to the 4017, it seems to kind of work, but I know there must be a better way to do that.
I'll keep posting updates as I proceed. In the physical world, I'm still looking for a way to mount these tiny PC boards from the recorders onto a larger prototyping board. They have tiny screwholes but I need some kind of tiny L-bracket that I can then solder into the proto board. I just haven't found anywhere that sells miniature L-brackets oddly enough. Too small for home depot!
Oh yeah on the schematic, for the audio play circuits U1-10 are manual spst switches. D1-D10 are LEds U11-U20 are the reset switches.
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