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Hello everybody! I'm back with another instructable. Its been quite a bit time since I posted by last instructable. So, this ones basically about how to build a 10 Step Analog Sequencer. You may also call it as the Atari Punk Sequencer. Here are some of its features:-

  • It has a built in Tone Generator ( Atari Punk Console).
  • It has an input audio jack which helps it to step the sound of any external audio source up-to 10 steps.
  • It has a pitch control for each of the individual steps. They work excellently when using the inbuilt tone generator. When using any external audio source, they help it in varying it's dynamic thing and feel.
  • It has a potentiometer for controlling it's tempo.
  • It also has another potentiometer for volume control.
  • It has a number of switches for turning on each indivisual step.
  • It has a potentiometer for selecting it's mode. This sequencer operates on two modes (I could have used a SPDT switch for that.) Now, for that in Mode 1, it steps up only upto the number of steps on before the next step is on and after that returns back to the first one. In Mode 2 , it steps upto the number of steps switched on and after that switches the steps which are off and then continues on the ones which are on.
  • It has an internal built in speaker but can also be used with an external speaker which can be selected with the help of a switch.

Before getting started with this project, I would strongly recommend you to try to make the Atari Punk Console and the Led Chaser; since this is a combination of both of them and a lot more. You must also be familiar with reading schematics.

I have given a lot of informative stuff in this instructable about different ICs used in this project, the power supply, etc. and have also embedded some videos that I found really informative and worth watching. These are not made by me and I don't own these videos about he ICs and other stuff. I've linked up the profile pages of the respective uploaders in the steps.

Do check out the above videos of the sequencer uploaded by me. They give a view of this awesome sequencer that's worth building.

I do hope that people just don't take my schematic and make everything on the perfboard and just finish up with the project. I want everybody to actually learn something while making this project.

There are lots of versions of this Sequencer; I'd recommend you to check them out too before starting up with this because you'll get lots of other ideas too.

I think that Wikipedia might explain it better than me.
"An analog sequencer is a music sequencer constructed from analog electronics, invented in the first half of the 20th century. At its most basic, an analog sequencer consists of a bank of potentiometers and a "clock" (pulse generator) connected to a sequencer, which steps through these potentiometers one at a time and then cycles back to the beginning. The output of the sequencer is fed to a synthesizer. By "tuning" the potentiometers, a short repetitive rhythmic motif or riff can be set up."

Step 1: Gathering the Parts

Parts Required for the 10 Step Analog Sequencer:-

  • Electronics Enclosure ( I used a cardboard box and decorated it with handmade paper)
  • Perfboard
  • Potentiometer
  1. - 470K X 3
  2. - 22K
  3. - 100K X 11
  • Integrated Circuits (ICs)
  1. - CD4017N
  2. - NE555
  3. - 556
  4. - LM386N
  • IC Base
  1. - 8 Pin X 2
  2. - 14 Pin X 1
  3. - 16 Pin X 1
  • Capacitors
  1. - 1000uF X 1
  2. - 4.7uF
  3. - 0.01uF X 3
  4. - 0.1uF
  5. - 10uF X 3
  6. - 0.047uf
  7. - 1uF
  • Diodes - 1N4148 X 20
  • LEDs (Any Colour) X 10
  • Resistors (all ¼ watt)
  1. - 1K X 3
  2. - 470
  3. - 10K X 2
  4. - 4K7
  5. - 10 Ohms
  6. - 47K
  • Switches
  1. - SPDT X 11
  2. - SPST
  3. - DPDT
  • Speaker 8 Ohms
  • Transistor - BC547 (Any Similar type like BC548, 2N2222 should work)
  • Audio Jack
  1. - 3.5mm Audio Jack Female X 2
  2. - ¼ inch Audio Jack Female X 2

Parts required for building the Power Supply:-

  • Transformer - 12-0-12 500mA Centre Tapped
  • AC Connector / CPU Socket (IEC) 220v
  • IC 7809CV
  • Heatsink
  • Diodes - 1N4007 X 2
  • LEDs (Any Colour) X 2
  • Capacitors
  1. - 470uF X 2
  2. - 1000uF
  • Resistors (all ¼ watt)
  1. - 2K2
  2. - 1K

All these are the minimum parts required for building the 10 Step Analog Sequencer. If you wish to, you may remove the power supply and use a battery as the power source.

Apart from this, you may use a number of other parts like:-

  • Male and female connectors for connecting all off board components like potentiometers, switches, etc.
  • Nuts and bolts to fix the transformer, AC Connector, etc.
  • LED Holders for mounting the LED's.

Besides you might also require the following parts in building the sequencer :-

  • Solder Iron
  • Solder Wire
  • Perfboard
  • Multi-meter
  • Heat Shrink / Electric insulation tape
  • Glue Gun
  • Wire
  • Third hand Soldering Helping Tool
manumaga4 months ago
Could you update the Schematic with more resolution please?
BartC241 year ago

I believe there are multiple errors in the schematic:

- the 555 has to be an astable multivibrator, for that we need a resistor in between pins 6 and 7, but these are connected to one another on the schematics
- the sequencer needs not to go to pin 2, but to pin 1, also an error on the schematics

Can you upload the .sch-file?

rafununu2 years ago

4017 isn't an analog component.

Arush Bansal (author)  rafununu2 years ago

Yes, indeed the 4017 Decade Counter is not an "analog component", nor is the 555 timer. The 4017 ic gives only high or low signals as pulses as outputs.

The 555 timer is a pulse generator (stepped tone generator) which is connected to the sequencer, i.e. the 4017 decade counter, which steps through these potentiometers one at a time and then cycles back to the beginning. By "tuning" the potentiometers, a short repetitive rhythmic riff can be set up. So, when you are tuning the potentiometers, you are varying the output of CD4017.

This makes this sequencer an Analog Sequencer. :-)