749 RHYTHM LOOPER and RANDOMIZER 9000
749 : RHYTHM LOOPER and RANDOMIZER 9000
- Author: william kennedy
- Description: a simple rhythm sequencer looper and a rAnDomiZeR. Uses a ring counter and LFSR
- GitHub repository
- Open in 3D viewer
- View in Wokwi
- Clock: 2 Hz
This is a little rhythm looper machine and randomizer machine.
The idea is for it to be used to make music or art installations!
How it works
There are 8 cascading D-type flip flops that create a ring counter OR a LFSR (Linear Feedback Shift Register), which will generate a psuedo-random bitstream (and casade that down the 8 flip flops).
Inputs
-
SW1 selects between the LOOPER and the RANDOMIZER:
- LOW = LOOPER (Ring Counter)
- HIGH = RANDOMIZER (Linear Feedback Shift Register or LFSR) NOTE!: you need some bits in the sequencer for the randomizer to work. (A "seed")
-
SW2 = LOOPER INPUT
- tap on and off to create new ring counter pattern
-
SW3 = CLEAR
- HIGH = hold to clear the ring counter pattern
Outputs
- There are 8 outputs, each one corresponding to an output of a flip flop on the ring counter
How to test
- Select the project on the chip!
- All switches OFF
- HOLD SW3 to clear any resididual pattern
- hold SW2 for 1 second, release
- should have a short looping pattern on any of the OUTPUTS
- Switch SW1 to HIGH
- Now the pattern should be randomized
External hardware
Inputs
- NEED 3 switches
- pulldown to GND
- LOW = 0V
- HIGH = 3.3
Outputs
- Drive strength (source/sink) 4 mA
- Outputs could hook up to a motor with MOSFET output circuitry
- Outputs could hook up trigger sounds, like drum samples, short one shot analog drums, gate oscillator sounds etc
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | switch between OFF = looper (ring counter) and ON = randomizer (LFSR) | OUTPUT1 | |
| 1 | toggle ON and OFF to make a new loop on the ring counter | OUTPUT2 | |
| 2 | hold to clear pattern (ON), or leave (OFF) to input your own rhythm loop using SW1 | OUTPUT3 | |
| 3 | OUTPUT4 | ||
| 4 | OUTPUT5 | ||
| 5 | OUTPUT6 | ||
| 6 | OUTPUT7 | ||
| 7 | OUTPUT8 |