Showing posts with label TR-808. Show all posts
Showing posts with label TR-808. Show all posts

Monday, 24 June 2024

NLC - More (cowbell drum module) - Build notes

These are my build notes for the nonlinear circuits "more" module.
It's a eurorack module.

This module contains three individual cowbell circuits based on those in the Roland TR-808.

Links
+ BOM

As far as parts go there isn't anything rare or hard to find.

CD 40106 
& three Opamps - TL072







CD40106 (CMOS IC with 6 Schmitt trigger inverters)

The really cool thing about this circuit is that it uses a logic chip to make metallic noise

Each bell uses 2 of the 6 oscillators.
I think in the 808, similar circuits provide the basis for the cymbal & hi hat sounds




The original 808 used band pass filters to remove the upper and lower partials.



Andrew's description is as follows:
"The filters are fixed as per the original design. This means the output
is loudest when the oscillators are set close to the operating frequency
range of the filters and softer when the oscillators are at much higher
or lower settings. For me, this seems fine, but mess with the filter
values if you like. I have seen some mods of the 2k2 to ground resistor
varied to change the filter range. In proto-typing, this was
experimented with but I didn’t feel it was much improvement."


resistors next

Diodes: LL4148



These are the power protection voltage rectifiers... or just use a 10 ohm resistor and dont plug the module in backwards.



You'll need a through hole +5V 100mA voltage regulator : 78L05. 


power header

Transistors : BC857, 847
Six 1M pots.

12 sockets



The accent input is tied to the trigger input via the switch tab,
probably best to use a gate rather than a trigger to get the sound going,
but that depends on what you want to do. Otherwise patch whatever you
like to make things happen.
This is a dense but easy build.



More links


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You can find more NLC builds here.
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Monday, 12 July 2021

Korg Midi Synchronizer - KMS 30

 This is a useful and pretty rare piece of kit from the 1980s.



Made in Japan, its great for clocking old gear .. esp Roland 808s, 909s, 303s etc
It enables sync between vintage Korg and Roland units. Not just MIDI sync but also DIN sync.
The KMS30 converts Midi clock to 24/48 PPQ  
Old Roland gear uses 24 PPQ
Korg gear uses 48 PPQ.
 
 
So this box is useful if you want to sync a Roland TB 303 with a Korg KPR-77 drum.
 

There are actually 3 time formats - Tape, Midi, and Din Sync.
 
Tape sync is now pretty obsolete, but it may come in handy if you have an old tape multi track deck 
You would need to record a TAPE CLOCK click track on one track of the tape. Then for your overdubs, as you play back the tape, you would connect the click track to the RCA tape in jack of the KMS30
 
 The KMS-30 can also be used to record a click track onto tape.
Note, this "click track" is FSK --- not an analog signal.
The DDM-110 is an old Korg Drum machine. 
There are plenty of old drums that will do this job, but it's a good example as it has
 a TAPE OUT jack & DIN sync jack
 


You sync it to the KMS30 via DIN and record it's audio (from the tape out) onto tape to make the click track.
 

Power supply is a 9V external PSU polarity (negative tip) .
 

 
Thanks to Ed of Elk Elktroniks for repairing it for me.
 
A bit about Midi, and Din Sync.
In the case of Roland DIN Sync, the standard is 24PPQN.
Lots of old Roland Synths such as the TB303 & TR606, 808, 909 use this standard.
Most DAWs will also use  a 24 PPQN signal 
 

 
 
MIDI clock in comparison sends a tick 96 times per quarter note.
 
Korg has it's own version of DIN Sync.
It uses the same 5 pin cable/socket, but the PPQN is 48.
When syncing Roland and Korg gear via DIN sync, they will work, however the Korg machine will run at 1/2 the tempo/speed of the Roland unit. 
 
This can be corrected with several devices which will translate 24-48 sync, such as the Korg KMS-30.
Another useful and easy to find device which will translate to 48 PPQN is the Arturia Beatstep pro.
 
A bit about the Tape out on this machine.
Can the tape in/out be used for syncing the clock of analog gear?  
No! Its Binary FSK (usually referred to simply as FSK) for syncing with multitrackers.
FSK is for slaving digital hardware to tape 
FSK =  Frequency-shift keying.
 
It is a modulation scheme typically used to send digital information between digital equipment such as teleprinters and computers.
 
You can actually hear the FSK signal if you plug it into some speakers.
There are 3 types of tone:
1. Clear, high pitch - leader tone. Usually it lasts for 3 seconds.
    Indicates that data output is about to begin
2. Lower pitched-noisy sound - data tone.
    Contains your patterns / songs/ clock encoded as digital data.
3. Clear, high pitch - end tone. Usually lasts for 2 seconds.
    Indicates that data output is over.
 
Note that many old 1970s, 1980s era synths and drums have a TAPE sync in/out.
The TR-909 has DIN sync IN, TAPE sync IN/OUT and MIDI. 
The  TR-505, 626, 707,727 all have midi, DIN & FSK/TAPE which makes them
pretty useful.
This is the rear of a 505.


This is the rear of a TR-707
 
Tape, in those days was really useful. In addition to being able to handle syncronization, you could also use it to store your pattern data.

The TR 707 & 727 drums
have MIDI, DIN SYNC and TAPE SYNC sockets. 
If you set it as the master, it sends sync signals out from all of the sockets. 
However, if you slave it to TAPE SYNC, it only sends out MIDI and DIN SYNC signals.
When set to be the slave it does not send any sync signals.
 
The Roland MC-202 has TAPE IN/OUT, one DIN sync IN and two OUT sockets.
Sadly no MIDI. If you slave the machine to TAPE sync, it sends DIN sync out on both sockets. 

Roland MC202

 
 
 

Thursday, 3 June 2021

Roland Index

 All my Roland related links here:

Drum Machines (General)

+ Roland 100m 

Roland MKS series

Roland SH series
 
TR-606

+TB 303
       + Intro & Setting up
       + Pattern write
       + Track Write

+ TR 707 / 727 Drum
           + Roland Tr 707 - pattern play
           + Happy 707 day  
           + Happy TR-727 day
 
+ TR 8 Drum
 
+ TR 808 Drum 
           + Repairing a Roland TR-808 - Part 1 - Opening the Machine           


+ TR 909 Drum
        + Roland TR 909 Programming Tutorial - getting started
        + Roland TR 909 - How to Program
        + Roland Tr 909 - Drum Mapping & Midi triggering

+ SE-02 (Studio Electronics / Roland)
       + Filter/Amp envelope
 
+ Junos 
 
+ MX-1 Performance Mixer

+ PSU
    + BOSS PSA Psu

  D-50

Misc

Friday, 9 October 2020

Online 808 . 303 emulation from Roland.

 There is no excuse not to add this to your bookmarks.

https://808303.studio/

 Its from Roland, sounds great & is free.
 
Roland and Yuri Suzuki have joined forces with the Design Museum to create 808303.studio.

  
A "Guy called Gerald" demos the emulation


Saturday, 19 September 2020

How to Program a Roland TR-808 - Quick start guide


Roland TR 808 - Quick Start

The 808 is a pretty basic machine that isn't too complicated to program, though it has a few odd quirks that are good to know. Before, you write any new patterns, it's important to clear the old ones.

How to clear old patterns 




1. Turn on with the top left power switch
2. Turn the MODE knob all the way to the left, to "Pattern Clear".
3. Choose which memory location you wish to erase by pressing one of the
    16 step buttons.
4. The "Basic Variation" switch needs to be in the AB position.
5. Press the Red "Pattern Clear" Button

yOU will see the AB LEDs flash really fast



 


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How to program a simple pattern (1st Part rhythms)

 
 
 
 
 
1. Clear any existing patterns (See above)
2. Turn the MODE knob to the "first part"
3. The LED should be blinking in time with the tempo.
    (If it's not blinking, check the sync switch at the back of the 808.
     It should be set to internal sync)
4. set the Basic variation to A. The A LED will light up.
5. Hit START.
   The LED should be running across the 16 steps
6. Set the scale (I mostly use the 3rd row which is 4/4 time)
 
 7. Use the "instrument select" rotary switch to choose your instrument.

8. Program your beats by pressing the step buttons (step mode) or the TAP button
   (Tap mode)

9. If you flick the Basic variation to B you can program the steps 17 to 32.
   The B LED will light up. (Keep the MODE Knob on "first Part")
   Setting the variation to A/B will play steps 1 to 32.


 

I generally use pre-scale 3 which is a standard 4/4.
If you want to go double time, use pre-scale 4
 
 
 
 
 
 

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How to Play existing patterns


Now that you have programmed lots of patterns, this is how you play them back. You can jump from one pattern to another.

1. Turn on with the top left power switch
2. Turn the MODE knob all the way to the left, to "MANUAL PLAY".
3. Choose which rhythm you wish to play by pressing one of the
    16 step buttons.
4. You will notice that the LED above the step button will flash.
5. The "Basic Variation" switch has 3 modes (A, B, and A/B) which gives you a total of 32 sixteen step patterns.
5a. Set the Basic variation to A. The A LED will flash.
6. Adjust tempo
7. Press the START/STOP Button

8. If you set the variation to B, steps 17 to 32 will play.
    Setting the variation to A/B will play steps 1 to 32.

9. Pressing a new step button will tell the 808 to play the rhythm stored in that memory slot.
 

aLWAYS check the sync switch at the back 
The 808 in this pic is the master, and is sending DinSync (clock info) to a TB 303.




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The Second Part

I don't use this very often, but it's good to know what it does.
The 808 allows you to program a total of 32 different patterns (16x2). 
Each memory has a 1st & second part that can be used for even more rhythm patterns.   

This second part is used to allow for rhythms other than 16 or 32 steps.
Use it if want 12 steps, or 18 or 24 steps. 
It allows you add the difference that you are missing from the first part to the second part.
For example, if you want to make a 24 step pattern, you can make the 1st part 16 steps long and
the second part, 8 steps long. Or you can make the 1st and second part 12 steps.

Below is an example of how to use the second part. 
 
This is how you add a second part to an existing 1st part.
 
1. Program your 1st part rhythm as shown above.
2. While it it playing turn the program knob to "second part".
3.  Hold the red button down & press the last step you wish the 2nd part to have.
    eg to add an extra 8 steps to your existing 16 step pattern, press the 
    8th step button. You now have a 24 step pattern.
4. When you that step button you will instantly hear the tempo 
    of your existing pattern change (it's slower).
5. Add your extra beats as above.
6. While the drum is playing you can add new sounds to each part 
    by switching the program knob between the two parts

   If the mode selector is on the 2nd part, then the LEDs will indicate
   the 2nd part only.
   If the mode selector is on the 1st part, then the LEDs will indicate 
   the 1st part only.

7. Press the START/STOP button when programming is finished.
 

How to program two 12 step patterns

 ie 12 steps in part A & 12 in part B

1. Choose a free Memory slot (steps 1 - 16)
2. Set mode to Pattern Clear. (set Basic Variation to A/B). 
    Clear patterns as above.
3. Set the Basic variation to A. The A LED will flash.
4. Set Mode to 1st Part Pattern Write
5. Press Start. 
    (The sequencer must be running for this to work).
6. set PreScale to 4

7. Press CLEAR  + step 12
    You can add some drum beats if you wish for the 1st part, or leave it empty for now.
8. Set Mode to 2nd Part Pattern Write
   (the LEDs for each step will go off)
9. Press CLEAR + STEP12
 
 
 

9a. Program some drumbeats for the second part.
   You have now set up a 24 step pattern and the flow of LEDs will change from the 1st part
   to the second part. (Note, the number of steps in the 1st & second parts don't need to be the same).
10. Set the mode selector to Part 1 to program new beats or exit that part if there are existing beats present.
    Likewise for part 2

   If the mode selector is on the 2nd part, then the LEDs will indicate the 2nd part only.
   If the mode selector is on the 1st part, then the LEDs will indicate the 1st part only.
11. Press the START/STOP button when programming is finished.

After you have done all this put the 808 into pattern play mode.
Now you can jump between  patterns in real time.


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I/F Variation Switch


I/F Variation = Intro or Fill-in Variation A or B
This performs the same function as the BASIC VARIATION switch, except it is only used for INTROs and FILL INs and relates to the last four white STEP buttons.
Intros and fill ins are additional rhythms separate from your basic rhythms. You add an intro at the beginning of your main rhythm, and a fill-ins between different basic rhythms.

 

 

 

 

 


The step buttons 1 to 16 are divided into two groups:
a) BASIC RHYTHMS (buttons numbered 1 to 12)
b) INTROS / FILL INs 
   (white buttons numbered 1 to 4)



 

 

 

 

 


Drum-fills will play automatically. This is based on the 'AUTOFILL-IN' knob selection.
The AutoFill-In knob can be set to 16, 12, 8, 4 and 2.
The selected "White Pattern" will automatically play every 16 or 8 or 4 measures etc
If the AUTOFILL-IN is set to 'Manual ' then the 'TAP" button will function as a 'FILL-IN' trigger... but only while the unit is playing.


You can turn the Intro/fill function on and off by pressing the TAP button.
When you first turn the mode to "play" you will see two LEDs lit:
a) One from the 1 -12 group  (flashing LED)
b) one from the 1 - 4 group (solid LED)
Pressing the start button will play the rhythm as standard.
BUT
If you press the TAP button first, the 1-4 LED will start to flash.
Now press the START button and the selected intro rhythm will play before the basic rhythm.
To disable this function just press the TAP button again, and the LED will stop flashing.


--------------------------------------------------


Setting the Pre-Scale.

Pre scale is the number of steps for each beat.
The prescale must always be chosen to match the minimum division of the note to be used in the rhythm pattern.
 
Matching the pre-scale on each of the recorded rhythms is really important. Though the switch may not change, each track can still run at different tempos. This was the case when I bought this drum second hand, all those years ago... I couldn't understand why each rhythm played at a different speed.
 

If you are playing a pattern and decide to change the pres-cale switch, don't forget to also press the red Pres-cale button.
 
 
 
 
 
 
 Example 1
To program a rhythm in 3/4 time.... uses a 12 step measure and the number 3 Pre Scale.

1. STOP the Rhythm
2. Set MODE to PATTERN CLEAR
3. Press a BASIC rhythm button (1 to 12)
    The LED should light up but not flash.
4. Set the Basic Variation switch to A
5. Press CLEAR button
6. Set MODE to PATTERN WRITE 1st PART
7. press START/STOP button
8. Set the Pre Scale selector switch to #3
9. Hold the CLEAR button down & press switch 12 at the same time.
10. Release the CLEAR button
 You have just set a 12 step pattern using a #3 Pre Scale.

Example 2: (basic 4/4 beat)
Create a 16 step pattern using the #3 pre scale 

1. Clear the memory as above (in A/B mode)
2. Set variation to A
3. Set MODE to PATTERN WRITE 1st PART
4. press START button
5. Set the Pre Scale selector switch to #3
6. Hold the CLEAR button down & press switch 16 at the same time.
7. Release the CLEAR button


Example 3.
You can change the time signature of existing rhythms without erasing them.
1. STOP the Rhythm
2. Select a BASIC rhythm button (1 to 12) to edit
    The LED should light up but not flash.
3. Set the Basic Variation switch to A
4. Set MODE to PATTERN WRITE 1st PART
5. press START button
    Your rhythm will play.
6. Set the Pre Scale selector switch to #3 (for example)
7. Hold the CLEAR button down & press switch one of the step switches (1 - 16)
   at the same time.
8. Release the CLEAR button

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Composing the Rhythm Track


Play/Compose/Track Clear

There is memory for 12 Rhythm Tracks .
It's labeled in orange and uses the instrument select dial.

This is how we sequence a entire performance.
It's done live.
 
1. STOP the Rhythm pattern.
2. Set the MODE to COMPOSE
3. You will see a Step LED flash. 
4. Set the instrument select to #1
    (to compose in bank 1)
5. Press TRACK CLEAR
6. Set both variation switches to A
7. Press START. 
    While in this mode every change of rhythm 
    patterns will be memorized.
8. Play your desired patterns in whatever order you wish.
9. Press STOP
    The exact time you press STOP is critical .... it must be exactly when the measure ends.
10. Set the MODE to PLAY to listen to your performance.
 
Each of the 12 tracks will memorize up to 64 measures.
These can be used separately or together for a max of 768 measures (12x64)

-----------------------------------------

It's important to note that both Variation switches are "play" function only.
The 808 doesn't memorise the setting of either switch.
When the drum plays rhythm #5, you can control if part A, part B or part AB is finally played.
I think this is a pretty neat performance feature.
 
+ TR 808 Drum links
           + Repairing a Roland TR-808 - Part 1 - Opening the Machine           
           + Roland Drum Machine Timeline

Friday, 4 September 2020

Roland Tr 808 repair - Part 2 - replacing the switches

How to open up the TR-808 .....continued from the last post:
Repairing a Roland TR-808 - Part 1

Now that you have opened up the beast you'll need to unplug the board from its various connectors.

 You can just make out 4 of them here.
The connectors are 40 years old & probably brittle ... take care.

The other 2 are tucked at the rear ... They plug into the PCB connecting the inputs & outputs.

Next you need to separate the main PCB from the front panel.
It's held in place with the remaining screws (11) & the nuts/washers for the pots & rotary switches.




(Mine was missing lots of nuts/washers.... I reckon they would have been once present).

These screws circled in green are the ones that are left
Remove the central screw last, and the PCB should just pop out.

If you look at the PCB carefully, you can see it's actually two boards joined just right to the last of 5 central switches


The Main board apart from housing things like the cPU & RAM, also has some of the voice circuits:
Snare, Claps, Maracas, Hi Tom/Conga, Mid Tom/Conga, Lo Tom/Conga, Bass Drum, Claves/Rimshot.

The Voicing Board has the circuits for the Cowbell, Cymbal, Open Hat, Closed Hat,
Mixer, & master Volume.

Now it's time to remove the step switch board

That volume pot (extreme right) is definitely not original.
I'll replace it one day! At the moment, it's working fine ... I prefer to let sleeping dogs lie
 iT'S held in place with 7 screws. They sit on standoffs.


Careful you don't break the ribbon cable
The FFC - flat flexible cable.

Admire those ICs


The 4011 is a 2 input NAND gate.
The 4051 is a multiplexer -- a digitally controlled switch

The 4 ICs on the top (D444C) are the memory.
I think they are 4K SRAM chips ???

This D650C is the CPU. It's the brain of the 808
You can also find a similar CPU the TR 606 (the 606 uses a D650C 128)
They are super rare . It's a 4 bit microcontroller
The UPD650C-085 is a special custom Roland (version 0.85) chip. It manages 11 analog channels with individual gain mix.
The voice board generates 16 analog percussions which 8 of them are circuit-shared.

The felt shades help to keep dust out.
There were originally shades on the toggle switches, rotary switches and all the pots I think ,
but mine are mostly gone ;-(
Next time I open this I must remember to put new ones in.

Notice The JRC 4558 (Japan Radio Corporation) in the bottom of the pic -- they are dual Op-amps.
These are everywhere on this board

The HD 14584 B  is a Hex Schmitt trigger


The AN6912 is a quad comparator


4013B - Dual type D flip/flop
4001 - Quad 2 input NOR gate
14584BP - Hex Schmitt trigger


The new board is on top.
Its a Technology Transplant board.

 The colours, esp the white buttons are slightly different.
Maybe the passing of time has faded  the white switches

Screw in your new step board & reassemble the machine


The PCB should slot into the front panel.


Plug the connectors.


That green cable is the ground.


hOPEFULLY  it works




Roland Links

+TB 303
       + Intro & Setting up
       + Pattern write
       + Track Write

+ TR 707 Drum
          + Roland Tr 707 - Drum Mapping & Midi triggering
           + Roland Tr 707 Drum - Basic programming
           + Pioneer Squid - Midi Mapping a Roland TR 707

+ TR 808 Drum
           + Repairing a Roland TR-808 - Part 1 - Opening the Machine

+ TR 909 Drum
        + Roland TR 909 Programming Tutorial - getting started
        + Roland TR 909 - How to Program
        + Roland Tr 909 - Drum Mapping & Midi triggering

+ SE-02 (Studio Electronics / Roland)
       + Transposing sequences with the keyboard 
       + Filter/Amp envelope