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CB-1 

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49. Install R7, 2.2K ohm resistor (red-red-red). This part plays a role in 
the keying of an attached radio. Depending on what type of microphone 
your radio requires depends on whether or not this resistor is used. In all 
of the Ramsey FX series transceivers and most handhelds, the resistor 
is required. We'll look at this part later when we get to the 
MICROPHONE CONSIDERATIONS section.   

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50. Install R17, 2.2K ohm resistor (red-red-red). 

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51. Install R20, 10K ohm resistor (brown-black-orange).   

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52. Install C6, .01uF disc ceramic (marked .01 or 103 or 10nF).   

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53. Install R24, 1K ohm resistor (brown-black-red). Notice that this 
resistor stands upright.   

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54. Install C10, 100pF disc capacitor (marked 100 or 101). This 
component combined with R24 determines the clock speed of the 
processor. If you power up the circuit later and you can see the displays 
flickering, check these two components for correct installation. 

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55. Install C7, 10uF electrolytic capacitor. Pay attention to polarity. This 
is a DC blocking capacitor for the audio out of the ISD chip. 

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56. Install U2, LM380 audio amplifier IC. Observe correct orientation of 
the part. 

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57. Install C2, 10uF electrolytic capacitor. Observe correct polarity. This 
part couples external mike audio to the audio amplifier.   

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58. Install R6, 10K ohm potentiometer (marked 103). 

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59. Install R26, 2.2K ohm resistor (red-red-red).   

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60. Install C4, .1uF disc ceramic capacitor (marked .1 or 104). 

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61. Install R13, 2 ohm resistor (red-black-gold). This component 
combined with C4 prevents U2 from going into high frequency 
oscillations.   

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62. Install C3, 220uF electrolytic capacitor. Pay attention to the polarity. 
C3 is the audio output coupling capacitor. 

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63. Install J2 and J3, both 1/8" mini jacks on the rear of the board. J2 is 
the speaker output, J3 is the keyed mike input. 

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64. Install J1, five pin DIN jack. This jack is where you may interface your 
radio with the CB-1 voice recorder.   

 
Congratulations!  You have just completed construction of the main board. 

Содержание CB1 CHATTERBOX

Страница 1: ...ed for longer record and playback times Loud 2 Watt audio output Very clean low noise DAST storage technology provides excellent audio quality Seven modes of operation available Even interfaces to rad...

Страница 2: ...R Series HF All Mode Receivers QRP Series HF CW Transmitters CW700 Micro Memory CW Keyer CPO3 Code Practice Oscillator Packet Computer Interfaces QRP Power Amplifiers RAMSEY MINI KITS Many other kits...

Страница 3: ...Parts list 7 CB 1 Assembly instructions 8 Initial testing 17 Troubleshooting 18 Using the CB 1 19 Microphone considerations 20 Parts Layout diagram 21 Schematic diagram 22 KIT ASSEMBLY AND INSTRUCTIO...

Страница 4: ...imply using your radio a lot This kit can take care of the tiresome tasks such as saying Over and out a call sign CQ your QTH or whatever Not only is this kit useful for repeating messages but it is v...

Страница 5: ...an the switches for mode play and address PA3 chip selects the voice recorder and through the pulse shaping circuit of Q7 resets the ISD1020 IC chip The SP output of the ISD1020 is taken through volum...

Страница 6: ...board for any possible solder shorts or cold solder joints All of these mistakes could have detrimental effects on your kit not to mention your ego Kit building tips Use a good soldering technique let...

Страница 7: ...2 220uF electrolytic C3 15 RESISTORS r 1 2 ohm resistor red black gold R13 r 2 75 ohm resistor violet green black R2 3 r 5 1K ohm resistor brown black red R4 5 8 24 25 r 3 2 2K ohm resistor red red r...

Страница 8: ...three pins r 2 Install voltage regulator VR1 7805 Observe correct placement of the metal tab Mount it so the lettering on the case is facing the edge of the board The 7805 provides a stable source of...

Страница 9: ...side of the board to verify that all 28 pins are sticking through the board before soldering After you check that all 28 pins are properly in place solder all pins Be very careful in soldering since s...

Страница 10: ...solder bridges when finished soldering This is where the microcontroller chip the IC with the sticker on top or marked XC705K1P is to be inserted Insert U3 into the socket being careful of bent under...

Страница 11: ...1 2N3904 transistor Watch the positioning of the flat side r 42 Install Q2 2N3904 transistor watching the positioning of the flat side Transistors Q1 and Q2 are used to key an external radio r 43 Inst...

Страница 12: ...orrect installation r 55 Install C7 10uF electrolytic capacitor Pay attention to polarity This is a DC blocking capacitor for the audio out of the ISD chip r 56 Install U2 LM380 audio amplifier IC Obs...

Страница 13: ...1 use the same care that you used for installing DS2 r 70 Install R2 75 ohm resistor violet green black This is another current limiting resistor r 71 Install S2 one of the mini push button switches I...

Страница 14: ...two joints check again to make sure the boards are square If all checks OK continue on to the rest of the solder pads checking for solder bridges as you go The more area that is connected with solder...

Страница 15: ...te or other color wire from the pin on the potentiometer labeled SW B to the hole on the main board near VR1 labeled SW B Solder the wire in place r 86 Connect a 5 piece of black wire from the pin on...

Страница 16: ...oldered in the correct places r 2 Make sure the power switch is turned off Plug in the 12VDC supply to J4 Make sure the center pin is the positive terminal and the outside of the jack is ground or neg...

Страница 17: ...ibed go to the trouble shooting section of the manual to determine how to resolve the problem TROUBLESHOOTING TIPS PROBLEM Neither display lights when powered up and there is no sound SOLUTION Use a m...

Страница 18: ...mike but allows audio to pass PROBLEM One or more switches won t work but everything else is OK SOLUTION Check the junction between your main board and the display board Many problems can arise here U...

Страница 19: ...CB 1 19...

Страница 20: ...you must understand the pins of the DIN connector on the rear of the unit 5 Pin DIN Jack Connections Pin 1 Audio output to radio mic in Pin 2 Ground Pin 3 Push to talk open collector Pin 4 Radio speak...

Страница 21: ...CB 1 21 CB 1 PARTS LAYOUT DIAGRAM...

Страница 22: ...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 you b...

Страница 23: ...CB 1 Assembly and Instruction manual for RAMSEY MODEL NO CB 1 RAMSEY ELECTRONICS INC 793 Canning Parkway Victor New York 14564 Phone 716 924 4560 Fax 716 924 4555 REQUIRED TOOLS Soldering Iron Radio S...

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