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SC-1mk500 Mic Preamp Kit

Solid State, DC-Servo, Balanced Mic Preamplifier

with Input Transformer Option

Simplicity Counts, Detail Matters.

No part of this document may be reproduced, either mechanically or electronically, posted online on the Internet, in whole or in

part, without the expressed, written permission of FiveFish Studios. This document is solely provided

to the kit builder of the SC-1mk500 Mic Preamp Kit.



2008 FiveFish Studios

www.fivefishstudios.com

Last Revision: November 29, 2008

Содержание SC-1mk500 Mic Preamp Kit

Страница 1: ...is document may be reproduced either mechanically or electronically posted online on the Internet in whole or in part without the expressed written permission of FiveFish Studios This document is solely provided to the kit builder of the SC 1mk500 Mic Preamp Kit Copyright 2008 FiveFish Studios www fivefishstudios com Last Revision November 29 2008 ...

Страница 2: ...o read manuals But unlike software there is NO UNDO for this project READ THIS ASSEMBLY GUIDE COMPLETELY FIRST Take your time and ask questions if you are unsure of something Work methodically and carefully I promise you you ll be rewarded with a great preamp when you re finished And you ll have pride and joy when you tell others that Yes I built this Prior Kit Building Experience is HIGHLY recomm...

Страница 3: ...this is not cheap junk but a high quality product that is reasonably affordable i e because there is no middlemen and we don t do expensive glossy magazine advertising Basic Tools Required A few basic tools are required to build this kit 1 Soldering iron adjustable temperature recommended but not necessary Your soldering iron must have a sharp conical tip I do not recommend a flat head screwdriver...

Страница 4: ...nd well lighted work area Lots of good lighting clean work area You want to be able to leave your work in progress without packing everything away Extra Tools Nice to have but not required 1 Vacuum desoldering pump if you make a mistake you need to pull out the component from the PCB 2 Component lead bender bend component leads like resistors uniformly and evenly 3 PanaVise to hold PCB while you r...

Страница 5: ... There are many types of capacitors used in the SC 1mk500 Mic Preamp project Some are big some small some are polarized some are non polarized We ll discuss the different types here Ceramic Capacitors Ceramic capacitors look like the picture on the left On the SC 1mk500 kit these are colored yellow and blue and are very small in size Ceramic capacitors are non polarized and therefore it does not m...

Страница 6: ... to a patch bay or another gear do not turn ON phantom power NEVER EVER plug a jack into a patchbay with Phantom Power turned ON You risk of damaging any gear connected at the other end of the patch bay and may even possibly damage your preamp In short turn OFF phantom power before connecting disconnecting the microphone and or jack It takes only a few seconds to do this Don t risk damaging your g...

Страница 7: ...f You need to toggle the switch to the leftmost position pointing to the LED to turn on phantom power If you mount the SC 1mk500 PCB vertically the switch will be turned ON pointing upwards If you mount the SC 1mk500 PCB horizontally the switch will be turned ON pointing left towards the LED Bourns Sealed Potentiometer This is another high priced item in this kit because it is another mechanical c...

Страница 8: ...ity excellent DC performance and wide output swing capable to within 1V of the power supply voltage which allows increased headroom IC2 is used as a DC Servo in the SC 1mk500 Mic Preamp Design IC3 is also an OPA2134 chip But this chip is used as a buffer before the TRIM potentiometer and after the potentiometer This also serves as a buffer before after the SEND RETURN insert pads IC4 IC4 is a THAT...

Страница 9: ...ER BOARD The SC 1mk500 preamp kit includes a 5 LED VU Meter kit for some basic metering This is also useful for gauging the strength of the signal and if there is any signal present during troubleshooting Please note that the accuracy of this VU meter is not 100 and therefore rely on your AD meters or DAW VU meters for the exact dB value of your signal This onboard VU meter is just meant for a rou...

Страница 10: ...rong locations For example Resistors R9 to R20 form the gain staging resistors It is important not to swap the locations of any of these resistors Otherwise your gain steps will be out of order depending on which resistors you swapped locations with each other For Example 6dB 12dB 24dB 18dB 30dB The resistors for the 18dB and 24dB were swapped with each other in this example Note the orientation o...

Страница 11: ...l IC sockets in the correct orientation This will serve as a reminder on how IC chips will be inserted TIP Use masking tape to hold the IC sockets in place while soldering Also make sure the Relay is oriented in the correct direction The line marking should be at the bottom STEP 5 Solder all ceramic capacitors to the PCB These are the yellow and blue capacitors The orientation does not matter Buil...

Страница 12: ...s the pin inside the hole until it is flush Then put the sticker over it Re attach the washer and the nut and tighten the nut by hand This will push the pin side and the sticker will keep it in place If you lost the included stop pins don t worry Just use some cut leads from a resistor STEP 11 Solder the LED to the PCB Observe proper orientation of the LED Otherwise the LED lamp will not light up ...

Страница 13: ... you prefer a clean neutral clear sounding preamp you can omit the use of the Input Transformer Build Notes a f you are NOT using an Input Transformer solder the 2K67 resistor in the RLP location Also Make sure to jumper the terminals as shown in this photo b If you are USING an Input Transformer solder the 6K8 resistor in the RLS location STEP 14 Build the VU Meter Module See the separate build i...

Страница 14: ...s going thru the hole on the front panel 5 To prevent scratching the front panel use a Socket wrench head 6 Make sure the PCB is mounted straight and not crooked 7 If you can t align the blue potentiometer properly or find it very difficult desolder the potentiometer from the PCB so it s free to move around Install the front panel tighten the nuts making sure everything is aligned then solder the ...

Страница 15: ... the input and output XLR jacks to the EDAC connector terminals Plug the EDAC connector the preamp kit apply voltage to the power pins 16Volts plus a signal source and a monitor speaker for the XLR output STEP 2B If you don t have any EDAC connector your only other choice is to plugin the preamp board to your 500 series rack It may be a good idea to remove any other module from your 500 series rac...

Страница 16: ...ltage between XLR pin2 and XLR pin1 You should be getting close to 48Volts if phantom power is switched on Problem My gain settings are out of order It will get loud very loud then soft then loud Check there are no shorts in the Grayhill selector pins Check that the resistors nearest the Grayhill selector are the proper values and that you did not swap any 2 of them Problem I turn on phantom power...

Страница 17: ...opyright 2008 FiveFish Studios No part of this document may be reproduced either mechanically or electronically posted online on the Internet in whole or in part without the expressed written permission of FiveFish Studios This document is solely provided to the kit builder of the SC 1mk2 Mic Preamp Kit Copyright 2007 FiveFish Studios ...

Страница 18: ...V C25 0 NOT USED LED1 1 LIGHT EMITTING DIODE Z1 Z2 Z3 Z4 4 12V ZENER DO 41 1 0W D1 D2 D3 D4 4 1N4004 D5 D6 2 1N4148 IC1 1 THAT 1510 IC2 IC3 2 OPA2134P IC4 1 THAT 1646 L1 L2 2 78F3R3J RC Q1 1 BC546B NPN transistor All resistors 1 4 watt metal film when available RLP 1 2K67 R10 R26 2 3K32 R2 R3 RLS 2 6K8 R4 R5 2 4R7 R6 R7 R9 3 10K R8 R29 R30 3 100K R11 1 1K43 R12 1 680R R13 1 324R R14 1 162R R15 R28...

Страница 19: ...NGLE TOGGLE SWITCH Knobs 2 KNOBS FrontPanel 1 mk500 FRONT PANEL T1 1 INPUT TRANSFORMER VU 1MK500 Rev1 2 Meter for mk500 Part Qty Desc PCB 1 Custom PCB VREG1 1 78L18 D1 D2 D3 3 GREEN LED D4 1 YELLOW LED D5 1 RED LED IC1 1 NTE1866 C1 1 0 1uf 100V C2 C3 2 0 47uf 50V R1 1 2K67 R2 1 6K32 R3 1 10K TRIMMER R4 1 8K2 Spacer 2 Aluminum 0 75 spacer Phillips pan head 4 40 x 1 4 2 4 40 x 1 4 Hex machine screw ...

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