Band pass filter

PCB reference RU80068.4

Estimated building time: 1,5 hours per filter

§  To complete this step the PCB with reference RU80068.4 is required in 8 copies.

Elektor Vocoder - Band Filter

§  Sort all required components as indicated in the BOM:

IMG 0741

§  Bend the diodes so that they fit neatly right away:

IMG 0742

§  Bend the resistors so that they fit neatly right away:

§  Label the 8 band pass filter PCB’s with their own frequency, this in order to prevent errors afterwards.

IMG 0747

§  Solder the diodes on the right position. Note the direction of the black line (component) and tabbed indication (silkscreen). Do not reverse the polarity of these components.

IMG 0743 2

§  Solder the resistors on the right position:

§  Put the 21 pin connector to the board, do not exert any excessive force.

§  Solder only pin 1 and pin 21 and check for a right angle. Correct if necessary and solder all remaining pins.

§  Add also the IC sockets by soldering only 1 pin. Check the direction and alignment of the IC sockets before soldering the remaining pins.

Band 1

§  Plug the corresponding IC's into the IC sockets, double check the direction of the notch to avoid destroyed IC's afterwards.

§  Insert both transistors, do not mix the BC547 and BC548, they look exactly the same.

IMG 0745

§  Solder only 1 of the legs, this allows lining up the components. Watch the direction of the transistor, correct if necessary and solder the remaining legs.

Band 2

§  Thereafter add the trimpots for tuning and adjustment of the filter later.

IMG 0746

§  Label the 8 band pass filter PCB’s with their own frequency , this in order to prevent errors afterwards.

§  Add the film capacitors as specified in the list below:

Only applicable for prototyping boards and depending on the choosen components, bend the capacitor legs as illustrated to adapt the lead spacing:

§  Finally use a pliers to press all solder pins into the PCB. The solder pins should have a diameter of 1 mm, the holes in the PCB have the same size. So firmly press the pins into the right position.

IMG 0750

§  Thoroughly clean the PCB using flux cleaner and check for bad soldering or tin bulbs:

IMG 0754

§  Repeat the above steps to complete all 8 band filters or click here to navigate back to the building guide.


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