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VAMISOUND V47F Building Instructions

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V47F
BUILDING
INSTRUCTIONS

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Summary of Contents for VAMISOUND V47F

  • Page 1 V47F BUILDING INSTRUCTIONS...
  • Page 2 V47F BUILDING INSTRUCTIONS Dear friend, first of all thank you for your support and choice of the VAMISOUND product. We wish you a happy DIY and the joy of a new microphone in your arsenal!! Jan and Milan...
  • Page 3 Before you start building your new microphone please carefully read this building instructions. Attention: VAMISOUND V47F is a medium-heavy project. It should be borne in mind that certain manual skills will be required or the successful completion of the mic construction. Good soldering experience and soldering stations with fine soldering tip are recommended.
  • Page 4 V47F printed circuit board set consists of four printed circuit boards - transformer pcb, main component pcb, HiZ section pcb and switch pcb. The set also includes two switches for PAD and HPF, one teflon pin, three polystyrene capacitors for HiZ section and also the interconnection hardware.
  • Page 5 The soldering machine is hot so we can get started. We're gonna start by installing the tranformer pcb. There are two matched resistor pairs. Specifically, R18 and R19 and the second matched pair R20 and R21. Match these pairs as close as possible. Solder also R22 and R23 (56R) resistors. Next you proceed with two film Wima capacitors.
  • Page 6 Set the main parts board with all resistors. Proceed further with film capacitors.
  • Page 7 Solder four BC547B transistors to the board. Make sure to solder them in the correct direction as the footprint on the board. Continue by fitting one BC557B transistor in T5 position.
  • Page 8 Only two electrolytic condensers remain. Orientation matters here. The longer foot of the electrolytic capacitor goes into the + pad on his footprint. Now solder the black six pin connector (female) to the main component board.
  • Page 9 Now solder the switches to the switch board. Make sure they fit nicely in the board. Also solder the pins. Clean the plates carefully with isopropyl alcohol. Take great care not to allow liquid to enter the switches.
  • Page 10 Now install the teflon pins on the HiZ pcb.
  • Page 11 Clamp the protruding part of the pins from the underside with pliers. On the HiZ board we start first with the point to point section. You install the FET and lead its GATE pin through the air to the teflon pin.
  • Page 12 Continue with resistor R5 and R3. Put one of its legs on the teflon pin.
  • Page 13 Solder R1. Its one leg is also on a teflon pin. Solder R4 and R6 as well. R2 is a 220M resistor. This value is very hard to find. So we use a series combination of two resistors 100M and 120M to give us the desired value in the result. Connect the legs at the top of the two resistors and solder them together.
  • Page 14 Now solder the BC557B transistor. Be cautious of its correct orientation. And also an electrolytic capacitor. Orientation matters here again. The longer foot goes into the + pad on his footprint.
  • Page 15 Clean the entire HiZ pcb with isopropyl alcohol. Now carefully solder the polystyrene capacitors. Be careful as these are very sensitive to over-soldering.
  • Page 16 Now it's time to install the output transformer. Always use the transformer manual for proper wiring. According to transformer manual, you need to connect the yellow and green wires on the transformer and also connect the two white wires. Insulate these connections with shrink wrap.
  • Page 17 The two black transformer wires are the shield. Solder them to the pads on the transformer pcb, which are marked "TS" (=transformer shield). Connect the purple wire to the "S-" pad on the transformer circuit board. Blue wire to pad "S+". Push the brown and red wires through the hole in the board, as it were, upwards. In the event that you would have missed the wire, extend it.
  • Page 18 Install three 20mm long M2.5 spacers on the transformer board. Also prepare three wires approximately 80mm long. Solder the three wires to pads I, II and III on the transformer board and thread it up through the hole.
  • Page 20 Now solder the three mentioned wires to pads named as I, II and III this time to the main parts pcb. You also connect the red cable from the transformer to the "P+" pad and the brown cable from the transformer to the "S-"...
  • Page 21 Now prepare the XLR insert. Solder 3 wires to it and also connect via remaining resistor leg pin 1 to the ground lug on XLR insert as you can see in the picture. Connect the so prepared connector insert to the transformer pcb, to the pads marked 1, 2 and 3. XLR1 to pad 1, XLR2 to pad 2 and XLR3 to pad 3.
  • Page 22 Take the six pin male connector and short its pins as you see in the picture. Use pliers. Install the prepared switch pcb into the four holes on the main parts pcb. Do not solder anything. Also tuck that shortened six pin connector into its counterpart (black female connector on main parts pcb). Make sure that this connector is all the way in and fits nicely in the female connector.
  • Page 24 Mount the HiZ pcb on the three spacer posts and also on the pins sticking out of the switch board and the six pin connector. Make sure everything fits together nicely and solder everything.
  • Page 25 Install the K47 style capsule on the round metal plate. It is always a good idea to cover the capsule, for example with a bag, to prevent it from getting dirty. Mark where the front side of the metal plate and front side of the capsule diaphragm is.
  • Page 26 Install the three brass extensions with holes so that you can later bolt the entire assembly to the microphone body. Their threaded holes should point outwards.
  • Page 27 Insert the assembled plates into the microphone body. Before doing so, unscrew the bottom metal plate from the body.
  • Page 28 Insert the XLR insert into place and screw it in. Then screw the entire bottom metal plate to the microphone body.
  • Page 29 Screw the whole set of plates to the microphone body tube with three screws. Now comes an important step. Make very sure that the components from the HiZ board will not touch anything above them and thus create a short circuit anywhere. If a component sticks out enough, bend it so that no contact can be made.
  • Page 30 All components on the HiZ pcb must be lower than the height of the three brass mounting hexagonal stands. Carefully connect the two wires from the capsule to the HiZ board. The cable from the front diaphragm goes to the "FD" teflon pin on the HiZ board. Backplate wire from the capsule to the "BCKP" pad on the HiZ board.
  • Page 31 So the capsule is connected to the circuit. The cable from the rear diaphragm doesn't connect anywhere. Just insulate the end of it to prevent unwanted short circuits, e.g. to the body chassis. Screw the entire capsule plate to the microphone chassis. Remove the packaging from the capsule.

  • Page 34: Additional Info

    WIRRING INFO 1) Capsule wiring: Front membrane cable to teflon pin marked as „FD“ from the top side of HiZ pcb. Cable from capsule backplate to „BCKP“ pad from the top side on the HiZ pcb. 2) Its always great idea to check phase of DIY microphone against commercial microphone. In case it was reversed, just swap the two cables on the XLR insert.

  • Page 35: Bill Of Material

    BILL OF MATERIAL Part Value Tol. Min.V Dimmensions link 1 link 2 notes olt. Resistors 10 % 6.3x2.4mm mouser link 100M 6.3x2.4mm mouser link R2 = R2a + R2b 120M 6.3x2.4mm mouser link 220M = 120M + 100M 100M 6.3x2.4mm mouser link 6.3x2.4mm mouser link...
  • Page 36 Part Value Tol. Min.V Dimmensions link type notes olt. 0.1uF mouser link film 2.2uF mouser link electrolytic 7mm height max. 0.33uF mouser link film 4.7uF 6.3V mouser link electrolytic 22uF mouser link electrolytic 0.1uF mouser link film mouser link film mouser link film 100pF...
  • Page 37 Part Value Tol. Min.V Dimmensions link type notes olt. M2.5 stand 20mm 6 pin female included in set 6 pin male included in set 90 gr. pins included in set included in set...