Dual TBridge Percussion: Difference between revisions

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= Concept =
= Concept =
The TBridge circuit was used in some famous analog drumcomputers. It is possible to create different drumsounds like bassdrums, toms, claves and more.  
The TBridge circuit was used in some famous analog drumcomputers. It is possible to create different drumsounds like bassdrums, toms, claves and more. The circuit was developed during the Homemade summercamp 2014 in Fou de Fougerette by Uwe Schueler, Tamara Wilhelm and Oliver Jaeggi.


On the board are 2 TBridge sounds circuits that can be played separately.  
On the board are 2 TBridge sounds circuits that can be played separately.


= Parts =
= Parts =


* 1*  TL082P  op-amp
* IC    TL082P  op-amp (or similar)


resistors  
resistors  
   
   
R3,4,13,14,16,17,25,26,27          RESISTOR_100k
* R1    100k    RESISTOR                                                                                         
* R2    100k    RESISTOR                                                                                       
R6,7        RESISTOR_2M , 4M used for different decay range of first sound
* R3   100k    RESISTOR                                                                                           
R18,19      RESISTOR_1.9M, 3.8M used for different decay range of second sound    
* R4    10      RESISTOR                                                                                         
R11        RESISTOR_10   
* R5    1.9M    RESISTOR                                                                                       
R23        RESISTOR_5.6    
* R6   3.8M    RESISTOR                                                                                           
* R7    100k    RESISTOR                                                                                         
* R8    100k    RESISTOR                                                                                       
* R9    100k    RESISTOR                                                                                           
* R10  10      RESISTOR                                                                                         
* R11  1.9M     RESISTOR                                                                                         
* R12  3.8M     RESISTOR                                                                                           
* R13  100k    RESISTOR                                                                                         
* R14  100k    RESISTOR                                                                                           
* R15   1k      RESISTOR
 
* P1, 2 1k.     POTENTIOMETER   for frequency of the percussion sound


R10, 22    ALPHA_POTI 1k  ALPHA_POTI  for frequency of the percussion sound
capacitors 


capacitors
* C1    100n    NONPOL      (C1B for wider cap)                                                                                           
C8, 9, 20, 21   CAP_100n    
* C2    100n    NONPOL      (C2B for wider cap)                                                                                           
C12, 15        CAP_4.7u pol
* C3    100n    NONPOL      (C3B for wider cap)                                                                                           
C5          CAP_47u pol      
* C4    100n    NONPOL      (C4B for wider cap)                                                                                           
C1, 24        CAP_10n     
* C5   10n      NONPOL                                                                                       
* C6   10n      NONPOL                                                                                         
* C7    4.7u     POL                                                                                               
* C8    4.7u     POL                                                                                           
* C9    47u      POL


* 2* switches (on-off-on) select the decay ranges
* 2* switches (on-off-on) select the decay ranges
* 4* jack connectors (2 * trigger in / 2 * audio out
* 5* jack connectors (2 * trigger in / 2 * boom out / mix out)


= Schematics =
= Schematics =
All 4 NAND Gates are connected in series from C to B to A to D. The values of the according capasitors are decreasing resulting in a higher frequency from the first to the last gate.  
A Dual OpAmp is used for 2 TBridge Oscillators. The Potentiometer controlls the frequency of the oscillator. The decayswitch selects different decay times of the sound (this also affects the frequency).  
The A/B switch connects the A or B NAND gate to the A/B Out-Jack. The B-IN switch connects supply voltage or the C NAND gate to the B NAND gate. The CV-ON switch turns the control voltage on/off. a transistor is used as a LED driver for the optocoupler.  
 


[[File:micronoise_pro.png|500px]]
[[File:DualTbridge_schema.png|500px]]


= Board =
= Board =


[[File:micronoise_board.jpg|400px]]
 
[[File:DualTBridge_PCB.jpg|400px]]


Mask (bottom):
Mask (bottom):
[[File:Micronoise_pro_pcb.pdf]]
[[File:DualTbridge_PCB.pdf]]


Parts (top):
Parts (top):
[[File:Micronoise_pro_parts.pdf]]
[[File:DualTbridge_parts.pdf]]


EAGLE Files:
EAGLE Files:
[[File:Micronoise_pro_eagle.zip]]
[[File:dualTBridge eagle.zip]]
 


= Built Devices =
= Built Devices =


[[File:micronoise_caseXT.jpg|400px]]
[[File:dualTbridge.JPG|400px]]
 
Micronoise pro in a case with additional 4 switches for routing signals of the NAND gates to the control voltage in. There is also a DIP socket for chosing the NAND gate that is controlled by the control voltage.
 
 
[[File:micronoise_casecut.jpg|400px]]
 
For this micronoise pro a laser cuted plexi front plate was used. The pads of the NAND gates output were connected to 4 LED with different colors to get a visual feedback of the sound.
 
= Demo Video =
 


{{#widget:Youtube|id=KNHleiE-QME}}
Dual TBridge Percussion device with piezo triggerpad to play the sounds by hand. The sounds can also be triggered by an external trigger signal. The piezo trigger pads have also trigger outputs to play external gear.

Latest revision as of 22:56, 24 October 2017

Concept

The TBridge circuit was used in some famous analog drumcomputers. It is possible to create different drumsounds like bassdrums, toms, claves and more. The circuit was developed during the Homemade summercamp 2014 in Fou de Fougerette by Uwe Schueler, Tamara Wilhelm and Oliver Jaeggi.

On the board are 2 TBridge sounds circuits that can be played separately.

Parts

  • IC TL082P op-amp (or similar)

resistors

  • R1 100k RESISTOR
  • R2 100k RESISTOR
  • R3 100k RESISTOR
  • R4 10 RESISTOR
  • R5 1.9M RESISTOR
  • R6 3.8M RESISTOR
  • R7 100k RESISTOR
  • R8 100k RESISTOR
  • R9 100k RESISTOR
  • R10 10 RESISTOR
  • R11 1.9M RESISTOR
  • R12 3.8M RESISTOR
  • R13 100k RESISTOR
  • R14 100k RESISTOR
  • R15 1k RESISTOR
  • P1, 2 1k. POTENTIOMETER for frequency of the percussion sound

capacitors

  • C1 100n NONPOL (C1B for wider cap)
  • C2 100n NONPOL (C2B for wider cap)
  • C3 100n NONPOL (C3B for wider cap)
  • C4 100n NONPOL (C4B for wider cap)
  • C5 10n NONPOL
  • C6 10n NONPOL
  • C7 4.7u POL
  • C8 4.7u POL
  • C9 47u POL
  • 2* switches (on-off-on) select the decay ranges
  • 5* jack connectors (2 * trigger in / 2 * boom out / mix out)

Schematics

A Dual OpAmp is used for 2 TBridge Oscillators. The Potentiometer controlls the frequency of the oscillator. The decayswitch selects different decay times of the sound (this also affects the frequency).


Board

Mask (bottom): File:DualTbridge PCB.pdf

Parts (top): File:DualTbridge parts.pdf

EAGLE Files: File:DualTBridge eagle.zip

Built Devices

Dual TBridge Percussion device with piezo triggerpad to play the sounds by hand. The sounds can also be triggered by an external trigger signal. The piezo trigger pads have also trigger outputs to play external gear.

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