Ramsey Electronics MX10, Assembly And Instruction Manual

Page 1: ...sktop 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 microp...

Page 2: ...ri Field Meter RAMSEY AMATEUR RADIO KITS DDF1 Doppler Direction Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator QRP Power Amplifiers RAM...

Page 3: ...it 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 KIT ASSEMBLY AND INSTRUCTION...

Page 4: ...ck it also has one stereo input for a phono with RIAA equalization boosts bass response of records The MX10 does not have any tonal controls for each channel but almost all users of this project will...

Page 5: ...ile line level audio has a level about 1V To get the microphone signal up to line level we will need an amplifier with a gain of around 20 In our case we have chosen an non inverting amplifier for the...

Page 6: ...levels from exiting the mixer U6 A and U6 B are both RIAA equalization circuits This compensates for the peculiar frequency response you get on records due to the way vinyl and the phonograph needle...

Page 7: ...sitive going signals If we did not DC rectify the signal we would constantly positively charge the capacitor on a positive pulse then negatively charge it on a negative pulse The net result would be a...

Page 8: ...ting both wires and pads simultaneously Apply the solder on the iron and the pad when the pad is hot enough to melt the solder The finished joint should look like a drop of water on paper somewhat soa...

Page 9: ...especially when there s a right way and a wrong way to solder it in Diode bands electrolytic capacitor polarity transistor shapes dotted or notched ends of IC s and so forth 4 Solder all connections u...

Page 10: ...10 1K ohm resistors brown black red R30 35 41 42 47 59 81 83 92 93 4 1M ohm resistors brown black green R53 56 64 66 2 2 ohm resistors red black gold R68 69 2 180 ohm resistors brown gray brown R57 67...

Page 11: ...resistor brown black orange 6 Install R8 a 10K ohm resistor brown black orange 7 Install R21 a 10K ohm resistor brown black orange 8 Install R17 a 10K ohm resistor brown black orange 9 Install R92 a...

Page 12: ...ow 30 Install R62 a 100K ohm resistor brown black yellow 31 Install R84 a 10K ohm resistor brown black orange 32 Install R38 a 100K ohm resistor brown black yellow 33 Install R45 a 10K ohm resistor br...

Page 13: ...4 pins are through the board before soldering the IC in place This IC is responsible for the peak hold circuits and the main mixer summing amplifiers circuits 46 Install R88 a 68K ohm resistor blue gr...

Page 14: ...l U2 the other LM386 audio amplifier IC Again make sure the notch is installed in the correct orientation Solder all 8 pins 73 Install R35 a 1K ohm resistor brown black red 74 Install R41 a 1K ohm res...

Page 15: ...rolytic capacitor Again check its orientation before soldering 89 Install C29 a 1uF ceramic capacitor marked 1 or 104 90 Install C27 a 0033uF ceramic capacitor marked 0033 or 332 91 Install C22 a 001u...

Page 16: ...MX10 Page 16...

Page 17: ...MX10 Page 17...

Page 18: ...1 or 104 113 Install C28 a 1uF ceramic capacitor Marked 1 or 104 114 Install C14 a 10uF electrolytic capacitor Orientation 115 Install C18 a 10uF electrolytic capacitor Again check installation direc...

Page 19: ...unted flush to the PC board Notice how the LEDs for the bargraph are laid out in groups of color We have two rows of three green LEDs on the left two rows of four yellow ones in the middle and two row...

Page 20: ...in or out Install D12 The long lead in this case faces in the opposite direction of the LEDs in the meter Note the triangle side on the parts layout Again this LED is mounted at the same height as th...

Page 21: ...ain check under it for possible shorts and make sure all the pins are through the board before soldering 152 Install S6 a DPDT type slider switch Make sure it is flush before soldering it 153 Install...

Page 22: ...MX10 Page 22...

Page 23: ...cks or plug in your earphones 4 Turn down all the controls to their minimum settings 5 Plug in a 12VAC power supply into J8 6 Verify that the destination is receiving your LINE level sound Vary the le...

Page 24: ...rouble shooting problem Now is a great time to have a little fun and teach yourself some trouble shooting skills Make sure a signal is present on both left and right inputs then trace through the circ...

Page 25: ...t destroy your parts taking them out since you may want to re install them later 1 Remove R57 a 180 ohm resistor brown gray brown 2 Remove C16 a 0033uF ceramic capacitor marked 0033 or 332 3 Remove R...

Page 26: ...MX10 Page 26 PARTS SIDE VALUES...

Page 27: ...MX10 Page 27 PARTS SIDE LAYOUT...

Page 28: ...MX10 Page 28 CONTROL SIDE LAYOUT...

Page 29: ...e PLL stereo transmitter To run this setup using an audio amplifier for DJing just remove the STC1 and replace the FM25 with the audio amplifier of choice To record a car tape or make a production rem...

Page 30: ...talog and see all of the projects that you can put together We have one of the most complete line of kits available today and many more products to come Give us a buzz well send you a catalog Call or...

Page 31: ...uch be assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I guess the red band really does look orange Ramsey Electronics project kits are packed with pride in the USA If yo...

Page 32: ...924 4555 www ramseykits com REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pliers Ramsey MPP4 or RTS05 Small Diagonal Cutters Ramsey RTS04 OR Technician s...