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Epic Polar Boost 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.

 

Components 

 

Original configuration 

 

ID 

Value 

Comment 

ID 

Value  Comment 

C1 

47n 

SMF/MKT/Wima 

R1 

1M 

1% metalfilm 

C2 

10u 

Electrolytic 25V+ 

R2 

33k 

1% metalfilm 

C3 

10u 

Electrolytic 25V+ 

R3 

1M 

1% metalfilm 

C4 

100u 

Electrolytic 25V+ 

R4 

4k7 

1% metalfilm 

C5 

3n3 

SMF/MKT/Wima 

R5 

1k 

1% metalfilm 

C6 

10u 

Electrolytic 25V+ 

R6 

15k 

1% metalfilm 

C7 

4u7 

Electrolytic 25V+ 

R7 

1M 

1% metalfilm 

C8 

100u 

Electrolytic 25V+ 

R8 

10k 

1% metalfilm 

C9 

100n 

SMF/MKT/Wima 

R9 

47k 

1% metalfilm 

C10 

10u 

Electrolytic 25V+ 

R10 

100R  1% metalfilm 

C11 

47u 

Electrolytic 25V+ 

R11 

33k 

1% metalfilm 

C12 

47u 

Electrolytic 25V+ 

R12 

Jump    

D1 

1N5817    

R13 

10k 

1% metalfilm 

D2 

1N5817    

R14 

10k 

1% metalfilm 

D3 

1N5817    

R15 

Jump    

IC1 

ICL7660S    

SW1 

DIP2  Gain/Bright 

P1 

C10k 

Boost 

SW2 

SPDT  Voltage 

P2 

NC 

  

VR1 

8k2 

1% metalfilm 

P3 

NC 

  

J1 

Jump    

Q1 

2N5457    

J2 

Jump    

Q2 

2SC1815    

  

  

  

* Optional parts (see modifications section) 

All parts need to be 25V+ rated 

 

Jump

 means place a jumper in this spot instead of a component 

NC

 means Not Connected, so leave it empty 

The main effect is configured as the original. The only deviation is the added switchable 18V 
charge pump. If you do not want that then read the modifications section on how to leave it 
out.

 

 

A=Log, B=Lin, C=Rev. Log

 

Summary of Contents for Epic Polar Boost

Page 1: ...Epic Polar Boost Building instructions v1 0...

Page 2: ...ed 2 Table of contents PCB layout 3 Components 4 Original configuration 4 Optimized configuration 5 Build sequence 6 Drill template 7 Switch 7 Off board wiring 8 Modifications 9 Charge pump 9 Tone sec...

Page 3: ...ly 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...

Page 4: ...R7 1M 1 metalfilm C8 100u Electrolytic 25V R8 10k 1 metalfilm C9 100n SMF MKT Wima R9 47k 1 metalfilm C10 10u Electrolytic 25V R10 100R 1 metalfilm C11 47u Electrolytic 25V R11 33k 1 metalfilm C12 47...

Page 5: ...7 1M 1 metalfilm C8 100u Electrolytic 25V R8 3k3 1 metalfilm C9 100n SMF MKT Wima R9 NC C10 10u Electrolytic 25V R10 Jump C11 47u Electrolytic 25V R11 4k7 1 metalfilm C12 100u Electrolytic 25V R12 390...

Page 6: ...The original version puts a 8k2 resistor in VR1 For this there are 2 special pads X and Y marked on the PCB which will fit this resistor Next comes the diodes If you want to experiment with another t...

Page 7: ...ll be the status LEDs Hammond 1590B case or similar in your favorite color This case will fit tightly and leaves no room for error If you need more room you could consider using a Hammond 1590N1 125B...

Page 8: ...istors You can change the value depending on the type of LED you use but 4k7 is safe enough for almost all LEDs 9V Note that the diagram is using star wiring for the ground connection The sleeve of th...

Page 9: ...s You could also change D1 back to a 1N4148 like the original D1 has no tonal function so it would be for optics purism only Tone section This is the interesting part and yes we are going to get a bit...

Page 10: ...bout the same as R6 in the original Now the tone control gives you a sweep between 3kHz and 48kHz while not changing the level of boost while turning the knob The bright switch SW1B will act a bit dif...

Page 11: ...bs to max boost and when applicable volume and tone and turn VR1 until you get to the spot that you like best as maximum boost This is up to personal taste and I always prefer to set it by ear but you...

Page 12: ...t 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 orie...

Page 13: ...ames 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 coo...

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