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SM042, Assembly Manual

PCB Version 1.2

Step 15: Centering the Pitch Potentiometer

Prepare a thin permanent marker or a soft pencil. You are going to determine the

exact mid-points for all three polarized potentiometers.

For your convinience, you could also outline the pointer lines on the Wave, AM, Attack

and Decay shafts.

Set the module to the settings pictured above. Monitor the output frequency with an

oscilloscope, frequency meter, tuner or your ears and turn the Pitch shaft counter-

clockwise until the frequency stops changing. This will be the mid-point for the Pitch

knob. Now draw a straight line on the shaft's edge, pointing exactly to the top. Later,

this line will help you to put on the respective knob correctly.

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Содержание SM042

Страница 1: ...050 220 220 1 uF 332J100 20 000 TL074CN TL074CN TL074CN CD4011BE CD40106BE TL072P TL072P TL072P LM393P LF 442CN SSSR Labs MCU Chip KOTELNIKOV 1 2 CD4042BE KP590KH5 AD7545A SM042 Assembly Manual PCB Ve...

Страница 2: ...th boards but pin header connectors and couple of aluminium capacitors are have to be soldered to the bottom side The order of assembly briefly can be described like that Install SMD components small...

Страница 3: ...ately aligned to its footprint then solder pins according to the order given in the picture above The pin 4 heatsink will require long heating up Don t worry about the overheating this component is de...

Страница 4: ...mall Signal Diodes Find the thinnest components a silicon small signal diodes Notice the polarity The black stripes indicating the cathodes must correspond with stripes on the PCB Solder all diodes to...

Страница 5: ...above picture as the reference to verify values before soldering Flip the PCB over trim the pins and reflow and solder everything to the bottom side This technique is the best method to accurately and...

Страница 6: ...left but there are chips with other directions marked by blue areas in the picture These sockets are very slippy so it s practical to gently bend their pins towards each other to help them fixate in...

Страница 7: ...ersion 1 2 Step 6 Bypass Capacitors Install and solder the 100 nF bypass capacitors labelled as 104 There are total of 21 of them In some early kits the MuRata ceramic capacitors was replaced with Epc...

Страница 8: ...o types of notation for a capacitor value Style 1 3 digit The first two digits should be read as they are and then you need to add as much zeroes as are indicated by the third digit and interpret this...

Страница 9: ...e Then install rectifier diodes and aluminium capacitors All of those are all polarized components As with the small signal diodes cathodes of the rectifier diodes are marked with stripes on diodes an...

Страница 10: ...ing the correct polarity Anodes are indicated by the sign on the board and the longer pins Remove the film from the front panel if there s any and install the panel onto the board through the switches...

Страница 11: ...ll connectors on the bottom side of Board 1 then construct a sandwich out of both boards as shown on the picture Solder all headers ensuring that all con struction is clamped tight and secure Insert e...

Страница 12: ...nded to solder two pins in the opposite corners then solder the remaining pins The six pins from 3 to 8 are connected with the ground plane and require extra heating It is also recom mended to plug th...

Страница 13: ...D4042BE KP590KH5 AD7545A SM042 Assembly Manual PCB Version 1 2 Step 12 Potentiometers Switches Jack Sockets Install all potentiometers toggle switches and jack sockets without washers and nuts Also if...

Страница 14: ...Front Panel Put on the panel back to its place Since you do not longer need access to the top side of the Board 2 you can put on and tighten all washers and nuts Solder everything It is advisable to c...

Страница 15: ...onding knobs Look over the module one more time and check everything you can Set the module to the settings pictured above Connect the power turn on your system and make sure that DRUID indicator is o...

Страница 16: ...pointer lines on the Wave AM Attack and Decay shafts Set the module to the settings pictured above Monitor the output frequency with an oscilloscope frequency meter tuner or your ears and turn the Pit...

Страница 17: ...of siren Find the position of the FM shaft where fre quency modulation is negligible or disappears completely This is the mid point for the FM control Outline the pointer line on this shaft Repeat th...

Страница 18: ...o the position shown on the left picture then install each knob one at a time keeping it in the correct position You may also put the edge of a business card or other object of similar thickness under...