Skip to content

Latest commit

 

History

History
122 lines (89 loc) · 5.4 KB

constructionguide.md

File metadata and controls

122 lines (89 loc) · 5.4 KB
Raw

2MoreF

Construction of CEM/AS3320 dual analog filter eurorack-modul.

Table of Contents

Preconditions

  • All parts must be available for Board A and B (see BOM-files: Board A and Board B).
  • The frontpanel is required for soldering Board A.

Construction

Board A backside (start soldering here!) backside-parts

start soldering parts on backside of Board A.

  • place all SMD resistors and capacitors to the backside.
  • place all SMD diodes to the backside. Watch the rigth orientation and alignment.
  • place the three IC's to the backside. Watch the rigth orientation and alignment.
  • solder all parts on backside (reflow or by hand).
  • fit the 20-/16-position, 1 row headers to backside and solder them.
  • at least Board A should look like this BoardA_backside (first Rev.: 0.1)

Board A topside topside-parts

continue soldering parts on topside of Board A.

  • place all SMD capacitors to the topside.
  • solder all capacitors by hand.
  • Don't solder yet any following parts before alignment to the frontpanel
  • fit that snapin-potentiometers P1,P2,P3,P5,P6,P7,P8,P10 and P11 on PCB topside.
  • fit that snapin-potentiometers P4 and P9 on PCB topside.
  • fit that switches S1,S2 on PCB topside. Must be ON-OFF-ON type with three positions.
  • fit that switch S4 on PCB topside. Must be ON-ON type with two positions.
  • fit that switch S3 on PCB topside. Must be ON-ON type with two positions.
  • fit all eleven jacks on PCB topside.
  • place the frontpanel on topside parts and allign them.
  • check alignment and distance to the frontpanel, see: alignment
  • use nuts for the jacks, switches and pots to fix that frontpanel to the PCB-parts.
  • now solder all parts on backside and make sure everything is still aligned.
  • take a final view on Board A and place the knops on potis P4 and P9.
  • at least Board A with mounted frontpanel should look like this: Frontpanel with BoardA

Board B backside (start soldering here!) backside-parts

start soldering parts on backside of Board B.

  • place all SMD resistors and capacitors to the backside.
  • place the two IC's to the backside. Watch the rigth orientation and alignment.
  • solder all parts on backside (reflow or by hand).
  • fit the 20-/16-position, 1 row pin-headers to backside and solder them.
  • at least Board B backside should look like this: BoardB backview

Board B topside topside-parts

continue soldering parts on topside of Board B.

  • place all SMD capacitors to the topside and solder them by hand.
  • place the two electrolytic capacitors C5,C6 to the topside and solder them.
    (watch the correct orientation and aligment)
  • fit the DIL18 sockets to topside and solder them.
    (watch the correct orientation)
  • fit the beads Filter1 and Filter2 to topside and solder them.
  • fit the 16 position, 2 row pin-header K1 to topside and solder it.
    (watch correct alignment to the silk)
  • fit the 10 position, 2 row pin-header K9 to topside and solder it.
    (watch correct alignment to the silk)
  • fit the precision-potentiometers P1,P2,P3 and P4 to topside and solder them.
    (watch correct alignment to the silk)
  • fit the eight styrene capacitors to topside and solder them.
  • at least Board B topside should look like this (with AS3320 in sockets): BoardB topview

First Switchon

Preconditions:

  • IC's:=AS3320 aren't yet fitted into the sockets on Board B.
  • Board A and B are mounted together with there header and multipoint connectors.
  • The frontpanel is placed on Board A and all nuts and knobs are mounted.
  • 16pin buscabel is connected between eurorack-bus and the modul (watch the alignment of Pin1 := -12V).

Action:

  • Switch on the power on the eurorack-case.
  • measure the voltage at socket X2, Pin14. Must be +12Volt.
  • measure the voltage at socket X6, Pin14. Must be +12Volt.
  • measure the voltage at socket X2, Pin13. round about -12Volt (without current-flow).
  • measure the voltage at socket X6, Pin13. round about -12Volt (without current-flow).
  • measure the voltage between testpoint TP1 and Ground GND.
    repeat this measurement between testpoint TP2 and Ground GND.

Result:

measured voltages on TP1/TP2 depending on the 'Frequency'-potentiometer position.

Poti-position measured voltage on TP1/TP2 (mVolt)
min (CCW) less then: +200 mVolt
max (CW) higher then: -100 mVolt

if this doesn't fit to above voltage-range the precision trimmers P1 | P2 (offset) have to be adjusted until that voltages are reached.

Postconditions:

  • IC's:=AS3320 are pushed into sockets on Board B. Watch the alignment of IC-pin1 to the socket.
  • Calibration of the modul is required.

License

Hardware:cc by-nc-sa 4.0