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.

Disclaimer

The contents of this document are provided as-is. The published information could contain technical inaccuracies, typographical errors and out-of-date information. This document may be updated or changed without notice at any time. Use of the information is therefore at your own risk without any liability for special, indirect, incidental or consequential damages resulting from or related to the use of this document.