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Ramsey Electronics MX10 Assembly And Instruction Manual

Professional compact stereo mixer
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Ramsey Electronics Model No.
Now here's the simple easy to use mixer for all of you home
brew DJs out there! This mixer has all of the features you will
ever need to mix audio as the professionals do - in a small
compact size! Perfect for DJing on the desktop transmitter,
making car tapes, mixing for a wedding or anywhere else a
mixer could be needed.
•
2 Line inputs, 1 phono and 2 mic inputs, all most people will
ever need!
•
Overload protection on the microphones input to "soften"
distortion
•
LED peak hold meters for accurate audio levels
•
Line output for driving amplifiers or transmitters such as the
FM-25
•
Slider pots control Main, Line1, Line2, panning and phono.
•
Small size with BIG audio quality!
•
Runs from 12VAC wall adapter
MX10 Page 1
MX10

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Summary of Contents for Ramsey Electronics MX10

  • Page 1 Ramsey Electronics Model No. Now here’s the simple easy to use mixer for all of you home brew DJs out there! This mixer has all of the features you will ever need to mix audio as the professionals do - in a small...
  • Page 2 MX10 STEREO MIXER INSTRUCTION MANUAL Ramsey Electronics publication No. MMX10 Revision 1.0 COPYRIGHT 1996 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc.

  • Page 3: Table Of Contents

    KIT ASSEMBLY AND INSTRUCTION MANUAL FOR MX10 STEREO THREE INPUT MIXER Table of Contents Introduction ...4 Circuit Description ...5 MX10 Parts List ...10 Assembly Procedure ...11 Schematic Diagram ...16 Initial Testing ...23 Troubleshooting ...24 Layout Diagrams ...26,27,28 Using the MX10 ...29 Warranty ...31...

  • Page 4: Introduction

    This leads to a nice effect on a transmitter for a listener to visualize the DJs. The MX10 was designed for simplicity, low noise, and low cost. Its small size makes it easy to carry around and store. Its long travel on the controls make it easy to mix audio signals smoothly and accurately.

  • Page 5: Circuit Description

    MX10. The most common active component is the opamps. These are used in a number of ways in the MX10, one of which is mixing. To perform mixing, an opamp is set up in what is called a summing amplifier.
  • Page 6 Each branch of the summing amplifier is connected the same as the ones in U4. When you switch between CUE and play, the signal is just redirected from the earphone summing circuits to the line level summing RIAA Equalization Frequency (Hz) MX10 Page 6...
  • Page 7 A M P L IT U D E T IM E The power supply for the MX10 is a little different than you may have expected. 12VAC is plugged into J8, the power jack. The 12VAC is then rectified to DC using diodes D29, 31, 34, and 35.
  • Page 8 (1). The part is then soldered securely to the board (2-4), and the remaining lead length is then clipped off (5). Notice how the solder joint looks on close up, clean and smooth with no holes or sharp points (6). MX10 Page 8...
  • Page 9 If a problem does occur, the manual will lead you through step by step in the troubleshooting guide until you find the problem and are able to correct it. MX10 Page 9...

  • Page 10: Mx10 Parts List

    RAMSEY MX10 PARTS LIST Semiconductors 3 LF347 Dual operational amplifiers (U4,5,6) 2 LM386 Audio power amplifiers (U2,3) 2 LM3915 LED bargraph drivers (U7,8) 4 1N4002 type diodes (black epoxy body with white stripe)(D29,31,34,35) 6 1N4148 type diodes (small glass body with black stripe)(D1,2,5,6,8,19)
  • Page 11 ASSEMBLY OF THE MX10 Now we are getting to the good stuff-assembling the MX10. We will begin by mounting first the low parts, beginning with the parts on the side of the board labeled as “PARTS” side on the PC board. When we are finished with that side, we will begin to install parts on the “CONTROL”...
  • Page 12 RIAA equalization for the phono amplifier. We want to check our circuit for cold solder joints and possible solder bridges. Also check the diodes you installed for correct orientation. Then we will be MX10 Page 12...
  • Page 13 57. Install R60, a 100K ohm resistor (brown-black-yellow). 58. Install D19, a 1N4148 type diode (orange glass body with black stripe). Make sure and install the stripe (cathode) in the same orientation as shown in the parts layout diagram. MX10 Page 13...
  • Page 14 Now we will move on to the higher profile components such as capacitors, switches and jacks. Before continuing we want to check all of our solder joints for possible solder bridges and cold solder joints. Now for ease of locating MX10 Page 14...
  • Page 15 DC from the rectifier, and finishes “smoothing” it out (regulation). 98. Install C25, a 10uF electrolytic capacitor. Orientation ! 99. Install C23, a .01uF ceramic capacitor (marked .01, 10n or 103) 100. Install C36, a 10uF electrolytic capacitor. Again note orientation. MX10 Page 15...
  • Page 16 MX10 Page 16...
  • Page 17 MX10 Page 17...
  • Page 18 120. Install J3, a 3.5mm stereo jack. 121. Install J7, another 3.5mm stereo jack. 122. Install J4, yet another 3.5mm stereo jack. 123. Install J8, a 2.5mm power connecting jack. 124. Install J2, a 3.5mm stereo jack. MX10 Page 18...
  • Page 19 131. Install the last of the green LEDs (D9 and D21). Again check for where the long leads go. 132. Install the first two yellow LEDs just to the right of the last green ones. (D10 and D22). Make sure the long leads are facing away from S3 MX10 Page 19...
  • Page 20 143. Install R40, a top mount 10K ohm potentiometer. (Green with black post) 144. Install R13, a top mounting 10K ohm potentiometer. (Green with black post). 145. Install R31, another top mounting 10K ohm potentiometer. (Green with black post). MX10 Page 20 Same height As switch tops...
  • Page 21 157. Install the wire into the grounding hole directly behind C26 on the parts side of the board. This wire is used to ground the MX10 directly to the rest of the audio system to reduce 60Hz hum in the audio.
  • Page 22 MX10 Page 22...

  • Page 23: Initial Testing

    INITIAL TESTING THE MX10 For this portion of the kit building experience you will need the following items: Line level source such as a tape deck, signal generator (SG-550) or CD player. Record level source such as a record player or signal generator.

  • Page 24: Troubleshooting

    MAIN is turned up full. SOLUTION: Because the MX10 has some gain, you will either need to keep the MAIN adjustment from going all the way to full, or you can open the FM10A or FM25B, and adjust the controls for level on their inputs.
  • Page 25 3. Remove R67, a 180 ohm resistor. (brown-gray-brown). 4. Remove C22, a .0033uF ceramic capacitor (marked .0033 or 332). Now the PHONO amplifier only will have a level flat gain of 1. Now you can use it for another line level input. MX10 Page 25...
  • Page 26 PARTS SIDE VALUES MX10 Page 26...
  • Page 27 PARTS SIDE LAYOUT MX10 Page 27...
  • Page 28 CONTROL SIDE LAYOUT MX10 Page 28...

  • Page 29: Using The Mx10

    Above shows a full installation for radio broadcasting using one of the Ramsey micropower transmitters. The parts and pieces are as follows: MX10, our newly built mixer STC1, Stereo transmitter companion. Compression, limiting, bass, midrange, and treble controls. Active 8th order lowpass to get rid of interfering sounds.
  • Page 30 Give us a buzz, well send you a catalog. Call or write: Ramsey Electronics 590 Fishers Station Drive Victor, NY 14564 PH# (585) 924-4560 FAX# (585) 924-4555 MX10 Page 30...

  • Page 31: Warranty

    But on rare occasions a sour component can slip through. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. Defective parts will be replaced promptly at our expense. If you suspect any part to be defective, please mail it to our factory for testing and replacement.

  • Page 32: Victor, New York

    Desoldering Braid Ramsey RTS08 • Digital Multimeter Ramsey M133 Price: $5.00 Ramsey Publication No. MMX10 Assembly and Instruction manual for: RAMSEY MODEL NO. MX10 PROFESSIONAL STEREO MIXER RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com...