Ramsey Electronics MX-5 Assembly And Instruction Manual Download Page 8

MX-5 Page 8 

As with all Ramsey kits, we want to mount the parts AS LOW AS POSSIBLE to 
the board. A 1/4” lead length on a resistor not mounted close to the board can 
act as an inductor or an antenna, causing all sorts of problems in your circuit. 
Be aware though that if there are stand up components in your circuit, they 
don’t need to be squished to the board. Keep the portion of the resistor closest 
to the board mounted right on the board. 

For each part, our word "Install" always means these steps: 
 

1. Pick the correct part value to start with. 

2. Insert it into the correct PC board location, making sure the part is 

mounted flush to the PC board unless otherwise noted. 

3. Orient it correctly, follow the PC board drawing and the written directions 

for all parts - 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 unless directed otherwise. Use enough heat and 

solder flow for clean, shiny, completed connections.  

Keeping this in mind, lets begin by sorting out our components and cross-
checking them against the parts list to make sure we have received everything. 

NOTE TO NEWCOMERS: If you are a first time kit builder you may find this 
manual easier to understand than you may have expected. Each part in the kit 
is checked off as you go, while a detailed description of each part is given. If 
you follow each step in the manual in order, and practice good soldering and kit 
building skills, the kit is next to fail-safe.  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. 

Summary of Contents for MX-5

Page 1: ...nsmitter or audio amplifier Perfect for mixing those car tapes before the big trip 2 Line inputs and one mic input all most people will ever need Overload protection on the microphone input to soften...

Page 2: ...F and UHF Transceivers HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW 700 Micro Memory CW Keyer PA Series VHF and UHF Power Amplifiers Packet Computer Interfaces QRP Power Amplifiers...

Page 3: ...Work 5 Learn As You Build 7 Parts List 9 Construction 10 Schematic Diagram 12 Setup And Testing 16 Troubleshooting 17 Parts Value Diagram 18 Parts Layout Diagram 19 Using the MX 5 21 KIT ASSEMBLY AND...

Page 4: ...uld notice that they have upwards of fifty or so channels and seven or more controls for each channel Each channel has reverb tone controls delay and more Our MX 5 has only two inputs for the line lev...

Page 5: ...g The microphone amplifier is slightly different from what you may have expected Not only does it have gain but it also has two diodes in the feedback of one of the amplifiers First we will talk about...

Page 6: ...ch more tolerable This soft clipping circuit prevents a person from overloading amplifiers or speakers by preventing high volume levels from exiting the mixer The output from the microphone amplifier...

Page 7: ...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 8: ...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...

Page 9: ...R23 5 1K ohm resistors brown black red R14 22 24 25 26 2 1M ohm resistors brown black green R19 28 1 47K ohm resistor yellow violet orange R27 Capacitors 11 10uF electrolytic capacitors C1 2 3 4 5 6 7...

Page 10: ...resistor brown black orange 8 Install R12 a 10K ohm resistor brown black orange 9 Install R22 a 1K ohm resistor brown black red 10 Install R16 a 10K ohm resistor brown black orange 11 Install R14 a 1K...

Page 11: ...t as possible 25 Install JMP2 using another scrap piece of component lead 26 Install R15 a 10K ohm resistor brown black orange 27 Install R17 a 10K ohm resistor brown black orange We are done installi...

Page 12: ...l C13 the LAST 10uF electrolytic capacitor If we have to remind you to check polarity again then Hmmm I guess you know the consequences 41 Install D3 a 1N4002 type diode black body with white stripe o...

Page 13: ...ee under each of the sliders that there are jumpers each end marked with a circle We will be installing these jumpers but only soldering the end with the circle into place before installing the slider...

Page 14: ...possible solder bridges INITIAL TESTING THE MX 5 For this portion of the kit building experience you will need the following items Line level source such as a tape deck signal generator or CD player...

Page 15: ...trouble shooting skills Make sure a signal is present on both left and right inputs then trace through the circuit using an oscilloscope or DMM set on AC to find where the signal stops You will need...

Page 16: ...MX 5 Page 16 PARTS SIDE VALUES...

Page 17: ...MX 5 Page 17 PARTS LAYOUT DIAGRAM...

Page 18: ...MX 5 Page 18 CONTROL SIDE LAYOUT...

Page 19: ...he PLL stereo transmitter SHA 1 Headphone amplifiers for monitoring sound To run this setup using an audio amplifier for DJing just remove the STC 1 and replace the FM 25 with the audio amplifier of c...

Page 20: ...r catalog 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...

Page 21: ...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 22: ...MX 5 RAMSEY ELECTRONICS INC 793 Canning Parkway Victor New York 14564 Phone 716 924 4560 Fax 716 924 4555 Printed on recycled REQUIRED TOOLS Soldering Iron Ramsey RTS06 Radio Shack RS64 2072 Thin Rosi...

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