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MIC&MOD U87, Руководство по сборке

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MIC&MOD U87 Скачать руководство пользователя страница 4

 

 

Place the BC547B transistor. The wires are in a triangle that matches the pattern on 
the PCB. 
 

 

 
 

Now place and solder the four 1N4148 diodes. There are four diodes on a strip. 
If you have good eyes, you can read that there is 1N4148 printed on them. 
The diodes have a black ring that should correspond with the white band printed on 
the PCB. Don’t place them reversed! 
 
 
 
 
 
 
 
 
 

Содержание U87

Страница 1: ...circuit boards PCBs one for the DC DC converter one for the audio circuit and a small one for the switches Before you start It is very important that you use the correct components All resistors are...

Страница 2: ...Next place and solder 3 resistors 22K ohm red red black red 6800 ohm 6 8K blue grey black brown and 680K ohm blue grey black orange...

Страница 3: ...acitors 10 pF and 27 pF They are marked 10 and 27 Place and solder two 1 nF capacitors 1nf 1000pF 1000 and the 22nF capacitors 22nF 0 022 F 0 022 Insert the 47 F capacitor and observe the polarity The...

Страница 4: ...n on the PCB Now place and solder the four 1N4148 diodes There are four diodes on a strip If you have good eyes you can read that there is 1N4148 printed on them The diodes have a black ring that shou...

Страница 5: ...The last diode to be placed is the 18 volts Zener diode This is one of the remaining diodes with the long leads It is marked C18 Also observe the correct polarity here...

Страница 6: ...potentiometer Finally insert the two solder pins in the PCB and solder them You may want to use a 1 mm drill bit to make the holes in the PCB a little bit bigger if the solder pins don t go in easy N...

Страница 7: ...ohm 8200 ohm grey red black brown 10 K ohm 10000 ohm brown black black red 47 K ohm 47000 ohm yellow violet black red 150 K ohm 150000 ohm brown green black orange 2x 1 M ohm 1000000 ohm brown black b...

Страница 8: ...original design use the 47nF capacitor 0 047 The original U87 has a filter that rolls off the low frequencies 40 Hz will be about 3dB referred to higher frequencies If you want a better LF response yo...

Страница 9: ...component side You can use a pair of needle nose pliers to insert it It may take some force to put it in but that is how it should be it shouldn t fall out Take one of the three 1 G ohm brown black gr...

Страница 10: ...lder a pair of short stiff wires here to make calibration easier in a later stage The last thing we need to do is to mount the output transformer Straighten the piece of 1 mm thick wire cut two pieces...

Страница 11: ...the low cut high pass filter Make sure that the switches are flat on the board before soldering them With the switches in place there are two capacitors that should be soldered to the small switch PCB...

Страница 12: ...should be up the PCB should be down Use the long M2 screws and the spacers to fasten the switch PCB to the top of the microphone body The three wires coming from the capsule can now be connected to t...

Страница 13: ...the two points next to the pattern switch Don t place the resistor too close to the switch PCB leave at least 8 mm of wire between the resistor body and the switch PCB Now mount the DC DC converter P...

Страница 14: ...use alcohol on the capacitors Now solder the ends of the 1 G ohm resistors we have just placed to the solder pins of the DC DC converter Solder two short wires to the points C and C of the DC DC conv...

Страница 15: ...audio PCB red pin 2 black pin1 and blue pin 3 White from the XLR connects to the oranje transformer wire red from the XLR connects to the yellow transformer wire Now we have to connect the wires we h...

Страница 16: ...metal of the microphone body 4 Adjust the black trimmer potentiometer on the DC DC converter PCB until you get 60 V on one pin and 60 V on the other pin Don t go higher than 60 volts because this can...

Страница 17: ...again to find the point where you get the lowest distortion in the output Take care that you don t overload the input of the microphone amplifier you are using You will find one sharp point where the...

Страница 18: ...Appendix Audio schematic DC converter schematic...

Страница 19: ...chance that you damaged the FET All FETs were tested before they were added to the kits If all other things are right the only solution is to order a new 2N3819 FET Q The pattern switch does not work...

Страница 20: ...r microphones is this normal A Yes the output of the U87ai is pretty high You can always use the pad switch but only use this switch if the distortion is caused by the microphone itself because it wil...

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