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The Senator v1.0 

 

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the 
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement 
is implied.

 

Off board wiring 

 

You can either mount the potentiometers directly to the PCB with special potentiometers or use the 
more traditional solderlug  potentiometers. 

Potentiometers non PCB mounted 

In the pictures below you see the correct pin numbering of the pots (Alpha 16mm style).  
Solder the wires accordingly and it is always a good idea to twist the wires together to create some 
extra shielding against external noise. The rectangle pad marks the pad for

 pin 1

You can break off the pin I marked with the yellow circle with a small pair of pliers. 

 

 

 

 

 

 

The wiring for the switches is the same, marking position 1 with a rectangle pad.  

Potentiometers PCB mounted 

Start by mounting the potentiometers to the PCB (bottom side), but do not solder them yet! Make 
sure you removed the pin with a small pair of pliers and that you screwed off the nuts. Also check if 
the component leads on the bottom side are cut as short as possible so they will not stick out too 
much. While holding the PCB move it in the enclosure like this: 

 

Now rotate the PCB and attach all nuts to the potentiometers and tighten them. If all fits well, solder 
the pots to the PCB, else adjust where needed. Make sure the bottom of the pots do not contact the 
PCB in any way as this might result in short circuit or other strange behavior! You can use the 
standard plastic caps that you can buy for the alpha pots, or tape the PCB under the pots of with 
some duct tape.  

   Gain                               Treble                                  Mid 

   Bass                               Level                                    Boost 

 3             2            1           3             2            1           3             2            1 

 3             2            1           3             2            1           3             2            1 

Summary of Contents for The Senator

Page 1: ...The Senator Building instructions v1 0 ...

Page 2: ...out 3 Components 4 Power section 5 Hardwire voltages 5 9V only 5 Build sequence 5 Enclosure drilling 6 Off board wiring 7 Potentiometers non PCB mounted 7 Potentiometers PCB mounted 7 Switches 8 Modifications 10 Transistors 10 Op amp 10 Clipping section 10 Pots 11 Troubleshooting 11 Schematic 12 Read this entire manual thoroughly before you start building the effect There are some available option...

Page 3: ... for circuit identification and where applicable their trademarks are the property of their respective owners who are in no way associated or affiliated with the author No cooperation or endorsement is implied 3 PCB layout Dimensions 84 mm x 49 6 mm 3 31 inch x 1 95 inch ...

Page 4: ...lfilm C14 470p MLCC R4 10k 1 metalfilm C15 220u Electrolytic 25V R5 680k 1 metalfilm C16 100n SMF MKT Wima R6 1k 1 metalfilm C17 10u Electrolytic 25V R7 1k5 1 metalfilm C18 47u Electrolytic 25V R8 100R 1 metalfilm C19 100u Electrolytic 25V R9 680R 1 metalfilm C20 100n SMF MKT Wima R10 680R 1 metalfilm C21 100n SMF MKT Wima R11 1k 1 metalfilm C22 10u Electrolytic 25V R12 47k 1 metalfilm C23 4u7 Ele...

Page 5: ... be very complicated for some people since the solder pads are very close together Use a magnifying glass to make the job easier The trick to soldering a PCB is to work from small to big components My building sequence suggestions in this section are based on the parts I used myself Sometimes some components are smaller or bigger so always use your own common sense and change the order accordingly...

Page 6: ...he holes for the input output and DC jacks and the footswitches as it is very taste dependent Note Really take some time to determine where and how to place the pots switches jacks and PCB in the enclosure before you start drilling Measure twice drill once Besides the components mentioned in the components table you will need 2 mono input jacks 2 1mm DC jack isolated 22 gage stranded hook up wire ...

Page 7: ...he yellow circle with a small pair of pliers The wiring for the switches is the same marking position 1 with a rectangle pad Potentiometers PCB mounted Start by mounting the potentiometers to the PCB bottom side but do not solder them yet Make sure you removed the pin with a small pair of pliers and that you screwed off the nuts Also check if the component leads on the bottom side are cut as short...

Page 8: ...ault you can use this configuration In this configuration SW2 caps is not installed You could use a small internal SP3DT switch ON OFF ON make a 3pin header with a shunt like in the picture or hardwire it There are other configurations possible like this one Note that there is little room between the potentiometers and when trying to fit a DP3T between them you cannot use the optional plastic case...

Page 9: ... who are in no way associated or affiliated with the author No cooperation or endorsement is implied 9 Ring Sleeve Tip Cathode short leg Input R led1 R led2 Anode long leg Cathode short leg Anode long leg Tip Sleeve Output Note that R led1 and R led2 are 4k7 resistors You can change these values depending on the type of LED you use but 4k7 is safe enough for almost all LEDs 9V ...

Page 10: ...could consider changing D2 to a red diffuse LED which will make it a bit smoother You might have to bend it a bit so it will not stick out to much D4 and D5 are RGB LEDs and you need to take some time and determine how you want to place them on the PCB The LEDs light up really nice and you might consider making them visible from the outside of the enclosure To do this I would advise you to insert ...

Page 11: ... correctly on the board Pay special attention to the polarity Check that you oriented the capacitors IC s transistors and diodes the right way SMF MKT and ceramic capacitors as well as resistors do not need to be oriented A likely sign of incorrect capacitors and or orientation is when an effect is sputtering rumbling or motorboating Check if you used the correct values of the components For resis...

Page 12: ...mes are mentioned solely for circuit identification and where applicable their trademarks are the property of their respective owners who are in no way associated or affiliated with the author No cooperation or endorsement is implied 12 Schematic ...

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