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Calibration  

 

1.

 

VCA trimmer:  

flick the toggle switch down, send a nice snappy ADSR into CV3 input. Adjust 

Bias trimmer to sweet spot, ie there is no DC thump. The chances are that that the sweet 
spot is around the mid position. 
 

2.

 

Scale trimmer:

 turn Emphasis all the way to self oscillation. Patch a 1V/oct source into CV 

input 1, with the attenuator fully clockwise. Play octaves and adjust the Scale trimmer until 
they are spot on.  

 

3.

 

Freq trimmer:

  you want to tweak this so that the filter is fully open when the Cutoff pot is 

fully clockwise. 

 

4.

 

Res trimmer:

 you can adjust exactly where the Emphasis knob starts to self oscillate. If in 

doubt, leave this trimmer in it’s mid position. 

 

 

 

 

 
 

RDH 17/11/18 

http://www.frequencycentral.co.uk/

 

Содержание Raging Bull 3.0

Страница 1: ...ignal will go to the VCA CV input unattenuated and the VCF CV input via the attenuator 2 By sending a gate into CV3 and setting the attenuator to zero the VCA can be gated while the gate has no affect on the VCF Key to PCB screen print n This signifies NPN BC547 transistors Note the correct pinout as shown by the half circles p This signifies PNP BC557 transistors Note the correct pinout as shown ...

Страница 2: ...1 C50K x 1 1K trimmer x 2 100K trimmer x 2 SPDT toggle x 1 3 5mm socket x 7 SPDT switch Male 40 pin header Female 40 pin header 10 pin box header Big knob Little knob CA3046 can still be got for some suppliers such as Banzai Das Musikding Small Bear and some reputable Ebay sellers http dsmcz com prestashop en sell UL1111 for only 1 53 they are functionally identical to CA3046 Alfa Rpar will shortl...

Страница 3: ...K 2 Solder all IC sockets 3 Solder all non electrolytic capacitors 4 Solder all transistors 5 Solder all electrolytic capacitors 6 Solder the power header if you re using box type observe correct polarity 7 Cut male headers to size and solder them into place Make sure that they stick out of the bottom of the PCB ...

Страница 4: ...nting tabs at the rear of the PCB then place the panel over them This will assure that they are correctly positioned Flip the whole lot over and solder the pots into place 4 Cut female headers to size and solder them into place Make sure that they stick out of the bottom of the PCB Note Not all pots and sockets are equal in height Providing you use the ones in the links provided everything will li...

Страница 5: ...e way to self oscillation Patch a 1V oct source into CV input 1 with the attenuator fully clockwise Play octaves and adjust the Scale trimmer until they are spot on 3 Freq trimmer you want to tweak this so that the filter is fully open when the Cutoff pot is fully clockwise 4 Res trimmer you can adjust exactly where the Emphasis knob starts to self oscillate If in doubt leave this trimmer in it s ...

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