Ramsey Electronics Phone Patch Mixer Kit PPM3, Assembly And Instruction Manual

Page 1: ...on without having to change any connections to return to your music or other programming Perfect for the budding talk radio star in your house Operates on 8 to 12 volts DC Automatic noise gating Automatic variable gain and compression Allows both sides of a phone conversation to be broadcast over the air Connect your line level audio source to the PPM3 and use the loop output no separate mixing bo...

Page 2: ...ter RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer DDF1 Doppler Direction Finder QRP Power Amplifiers RAMSEY MINI KITS Many other kits are available for hobby school Scouts and just plain FUN New kits are always under development Write or call for our free Ramsey catalog PPM3 PHONE PATCH MIXER KIT MANUAL Ramsey Electronics publication No MPPM3 ...

Page 3: ...As You Build 8 Parts Placement Diagram 11 Parts List 12 Schematic Diagram 14 Assembly Steps 15 Testing your PPM3 21 Troubleshooting Guide 23 Specifications 25 Warranty 27 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR RAMSEY ELECTRONICS INC 590 Fishers Station Drive Victor New York 14564 Phone 585 924 4560 Fax 585 924 4555 www ramseykits com ...

Page 4: ...new dimension to your transmitting broadcasting experience Now you can allow the locals to call in and voice an opinion and hear it broadcast on your micro station Hey we all know how much people love to hear their own voice on the radio They re probably listening to you already and wondering how come you get to have all the fun We know it s because you re spending all the time and money but they ...

Page 5: ...If you re not sure what your mic needs install R13 The signal is AC coupled by C33 before it goes into the pre amp A value of 5 6nF was chosen because with an input impedance for the pre amp of 180 K a high pass filter is utilized that cuts out frequencies below roughly 150 Hz In effect this is desirable for a vocal microphone because it will eliminate some annoying pops and other low frequency no...

Page 6: ...hook and can even have spikes upwards of hundreds of volts the first three caps in the circuit C3 C4 C5 were chosen to be able to handle 1 kV each R30 performs some signal attenuation and isolation and then the isolation transformer T1 further helps prevent unwanted interference between the phone line circuit and the PPM3 circuitry T1 also takes the differential phone audio signal and converts it ...

Page 7: ... the phone circuit if a different com pression ratio is desired The clip detect circuit that powers the clip LED is basically constantly com paring the signals from both the left and right channels against a set threshold that is close to the mixer amp s upper voltage rail which is where it clips There is a little amount of hysteresis to enable the LED to be lit up long enough to visibly see it du...

Page 8: ...ue let your soldering iron tip gently heat the traces to which you are soldering heating both wires and pads simultaneously Apply the solder to 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 soaked in Mount all electrical parts on the top side of the board provided To install parts the component should be pla...

Page 9: ...arkings that may be found on the kit parts Carefully sort the parts into small piles to aid in finding the correct part at the required time Proper Component Installation Surface mount component soldering instructions The SMT components will be affixed to the topside of the PC board in the U1 and U3 positions Patience is the key when installing surface mount components Typically the first step aft...

Page 10: ...mount components to the printed circuit board before soldering The procedure is to take a small amount of glue usually with a pin or toothpick and dab the circuit board in the place where the component will be affixed Be careful not to apply too much glue as when the part is placed it may squash the glue underneath the soldering tabs of the component Carefully place the part into position and when...

Page 11: ...PPM3 Page 11 PPM3 PARTS PLACEMENT DIAGRAM ...

Page 12: ...21 C27 C28 1 1000uF electrolytic capacitor cylindrical body with a stripe or band marked 1000uF C10 Resistors 1 10k stereo audio pot R2 2 10k audio pots R12 R15 5 470 ohm resistors yellow violet brown R6 R17 R19 R20 R28 7 4 7k ohm resistors yellow violet red R7 R8 R10 R11 R23 R24 R31 1 5 6k ohm resistor green blue red R30 4 10k ohm resistors brown black orange R13 R14 R16 R18 3 15k ohm resistors b...

Page 13: ...hone amplifier ICs U1 U3 Miscellaneous Components 3 DPDT switches S1 S2 S3 1 1 4 stereo jack J7 1 Dual RJ11 jack J1 1 2 1mm power jack J4 2 Dual RCA jacks J2 J3 1 Isolation transformer large yellow part with 6 leads T1 1 Piece of heat shrink tubing ...

Page 14: ...PPM3 Page 14 PPM3 SCHEMATIC DIAGRAM ...

Page 15: ...wo of the legs of the chip 2 In the same way install U1 The notch or dot on this chip is placed toward C30 opposite of U3 that you just installed Follow the same method and be sure that the pins line up well before soldering them all into place Whew That was some work But the toughest two parts have been placed Check over your work to be sure there are no unwanted bridges and that the pins all loo...

Page 16: ...d Part Layout Diagram for correct placement of the band before soldering the part in place 12 Install R21 15k ohms brown green orange 13 Install R20 470 ohms yellow violet brown 14 Install C17 10uF electrolytic capacitor Remember to watch the polarity when installing 15 Install R13 10k ohms brown black orange 16 Install D7 another 1N4148 diode orange glass body with black band Remember to line the...

Page 17: ...9 another 1uF electrolytic capacitor Polarity 40 Install C28 and C27 10uF electrolytics Again be sure they re marked as 10uF and watch the orientation when installing 41 Install C25 1uF electrolytic capacitor Bet you can guess that I m going to tell you to be sure you orient it correctly before soldering But hey being reminded beats a big popping sound when you fire up your kit and a cap explodes ...

Page 18: ...polarity on one more of these parts But like your parents always said when they gave you advice as a kid you ll thank me later 58 Install C33 5 6nF marked 562 59 Install R9 39k ohms orange white orange 60 Install C15 the last 10uF electrolytic Oh go ahead you know you have to make sure you install it correctly Well the regular parts and the surface mount parts are in now we ll tackle some of the l...

Page 19: ... s flat part Trust me you really will thank me later 66 Install J1 the dual RJ11 jack This part snaps into place so that it is positioned correctly Solder all leads 67 Install T1 the isolation transformer You ll see a dot on the PC board and a dot on the part Orient the part so that the dots line up and solder all leads 68 Install S2 one of the DPDT switches To get these parts to lay down flat on ...

Page 20: ...nger anode lead of the green LED D5 Place the LED with the longer shielded lead toward the outer edge of the PC board Bend the leads slightly on the backside of the board to hold the part in place and solder it in 75 Take the leftover piece of heat shrink tubing and place it over the longer lead of one of the red LEDs This one will be D6 Again leave the leads long make sure the tubed lead is facin...

Page 21: ...o 15 volt DC power source to J4 3 Turn on your PPM3 the green power LED should light 4 Connect your RCA cable from the line level source to the dual RCA jack labeled Input on the back of the PPM3 5 Connect your RCA cable from the dual RCA labeled Output on the PPM3 to your stereo or other audio device with a line level input This will be used to test the audio section of the PPM3 Later you ll disc...

Page 22: ...ull hybrid phone interface and that s why it doesn t cost hundreds of dollars When you return to your normal programming you can speak into the mic like a typical DJ A speakerphone may be the best option for use with the PPM3 allowing you to continue using the higher quality microphone audio for the over the air signal but still allow the person on the other end of the phone to hear you This solut...

Page 23: ... Working backwards through the assembly steps will often lead you to the problem Revisit the extensive theory of operation included in this manual and try to apply it to your specific problem Have another set of eyes look through your work Here at the shop we have often run into a stone wall of a problem only to have a fellow technician see our obvious error It is sometimes very difficult to see y...

Page 24: ...rrectly If the power on LED is not working make sure you have a good input voltage source and that it is plugged securely into the power jack on the PPM3 Ok it seems simple but make sure the power switch is pressed If the Mic Mute LED is not lit check to be sure that that switch is pressed The same goes for the Clip LED you must have the Phone Mute button pushed and there must be enough audio leve...

Page 25: ...pe that you enjoy the use of this Ramsey product As always we have tried to compose our manual in the easiest most user friendly format that is possible As our customers we value your opinions comments and additions that you would like to see in future publications Please submit comments or ideas to Ramsey Electronics Inc Attn Hobby Kit Department 590 Fishers Station Drive Victor NY 14564 Please a...

Page 26: ...PPM3 Page 26 ...

Page 27: ... much 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 believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey please write or call us with information on the part you ne...

Page 28: ... RAMSEY MODEL NO PPM3 REQUIRED TOOLS Soldering Iron Ramsey RTS06 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pliers Ramsey RTS05 Small Diagonal Cutters Ramsey RTS04 ADDITIONAL SUGGESTED ITEMS Soldering Iron Holder Cleaner RS64 2078 Holder for PC Board Parts Ramsey RTS13 Desoldering Braid Ramsey RTS08 ESTIMATED ASSEMBLY TIME Beginner 2 hrs Intermediate 1 25 hrs Advanced 0 75 hrs RAMSEY ELECTRON...