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PHONE PATCH
MIXER KIT
Ramsey Electronics Model No.
Ever wish you could broadcast on-the-air telephone calls like
the commercial radio stations? Well now you can! The PPM3
gives you the ability to broadcast both sides of a phone
conversation 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 board needed
PPM3 Page 1
PPM3
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Table of Contents
Summary of Contents for Ramsey Electronics Phone Patch Mixer Kit PPM3
- Page 1 PHONE PATCH MIXER KIT Ramsey Electronics Model No. Ever wish you could broadcast on-the-air telephone calls like the commercial radio stations? Well now you can! The PPM3 gives you the ability to broadcast both sides of a phone conversation without having to change any connections to return to your music or other programming.
- Page 2 PPM3 PHONE PATCH MIXER KIT MANUAL Ramsey Electronics publication No. MPPM3 Revision 1.3 COPYRIGHT 2002 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.
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Page 3: Table Of Contents
Parts List ...12 Schematic Diagram ...14 Assembly Steps ...15 Testing your PPM3 ...21 Troubleshooting Guide ...23 Specifications ...25 Warranty ...27 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com PPM3 Page 3... -
Page 4: Introduction
PPM3 INTRODUCTION We’ve all heard those awesome call-in programs on the radio. You know, the ones where the host lets the average Joe give his opinion on-the-air to all of his listeners . . . regardless of intelligence level or speaking skills! Yes, we’ve all been embarrassed for poor old Joe when he puts his foot in his mouth and we’ve all thought that we could be much more brilliant and interesting than the high paid host we’re listening to. -
Page 5: Theory Of Operation
PPM3 CIRCUIT DESCRIPTION The PPM3 is essentially a stereo audio mixer, with one stereo line input and two specialized mono inputs, each feeding into the stereo line output. The phone and mic inputs each have a pre-amp stage that acts as a complete sig- nal conditioner. - Page 6 The microphone pushbutton switch (S3) is used to turn on the mic channel by pushing it in, and to mute the mic channel by leaving it out. The mic LED is powered on when the mic is on by using the other half of the switch. The phone line input is meant to monitor both ends of a phone conversation.
- Page 7 the far-end phone. So the solution is to use a high amount of compression in order to amplify the far-end, weaker signal much more than the local stronger signal. In this way both sides of the conversation are closer to each other in signal strength when applied to the main mixer.
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Page 8: Learn As You Build
RAMSEY “LEARN-AS-YOU-BUILD” ASSEMBLY STRATEGY Be sure to read through all of the steps, and check the boxes as you go to be sure you didn't miss any important steps. Although you may be in a hurry to see results, before you switch on the power check all wiring and capacitors for proper orientation. - Page 9 Although we know that you are anxious to complete the assembly of your phone patch mixer kit it is best to follow the step-by-step instructions in this manual. Try to avoid the urge to jump ahead installing components. Remember that all of the components will be mounted on the component side of the circuit board and soldered on the solder side of the circuit board (the side that contains the printed circuit traces).
- Page 10 Once this is accomplished, the part can be installed by holding it with tweezers in contact with the “tinned” trace and re-heating the solder (see the associated diagrams). Another commonly used technique is to glue the surface 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”...
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Page 11: Parts Placement Diagram
PPM3 PARTS PLACEMENT DIAGRAM PPM3 Page 11... -
Page 12: Parts List
PARTS SUPPLIED WITH YOUR PPM3 KIT Capacitors 2.2nF ceramic disc capacitor [marked 222] (C16) 5.6nF ceramic disc capacitor [marked 562] (C33) 10nF ceramic disc capacitors [marked 103] (C11,C13,C23) High voltage 10nF capacitors [large red capacitors marked .01M] (C3, 47nF ceramic disc capacitor [marked 473] (C31) 0.1uF ceramic disc capacitors [marked 104] (C8,C9,C22,C24) High voltage 0.1uF ceramic disc capacitor [very large orange cap marked .1M] (C5) - Page 13 SSM2165-1S surface mount microphone amplifier ICs (U1,U3) Miscellaneous Components DPDT switches (S1,S2,S3) 1/4” stereo jack (J7) Dual RJ11 jack (J1) 2.1mm power jack (J4) Dual RCA jacks (J2,J3) Isolation transformer [large yellow part with 6 leads] (T1) Piece of heat shrink tubing PPM3 Page 13...
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Page 14: Schematic Diagram
PPM3 SCHEMATIC DIAGRAM PPM3 Page 14... -
Page 15: Assembly Steps
PPM3 PHONE PATCH MIXER ASSEMBLY Assembly of the PPM3 is easy but still requires some time and patience. We will start with the surface mount parts and get them out of the way. As with any static sensitive parts be careful when installing the IC’s in this kit. - Page 16 5. In the same way install C20, a 10uF electrolytic capacitor, again checking your polarity before soldering. 6. Install C19 and C18, noting that these are also 10uF electrolytics and the polarity is exactly opposite to the two parts you just installed. Simply follow the silkscreen and layout diagram for proper placement.
- Page 17 25. Install R19, 470 ohms (yellow-violet-brown). 26. Install R27, 15k ohms (brown-green-orange). 27. Install C23, 10nF (marked 103). 28. Install C22, 0.1uF capacitor (marked 104). 29. Install R22, the last 15k ohm resistor (brown-green-orange). 30. Install R18, 10k ohms (brown-black-orange). 31.
- Page 18 We’ll skip T1 for now and come back to it later. 46. Install C31, 47nF (marked 473). 47. Install D2, 1N4148 diode (orange glass body with a black band). Orient the black band with the band marked on the silkscreen and PC board layout.
- Page 19 save them for last. Ok, that’s not the reason, it just makes sense to do them after all the big, bulky parts are in. 61. Install C10, the big 1000uF electrolytic capacitor. Ok, one last time, for real, make sure you get the positive lead and the negative lead oriented correctly before soldering.
- Page 20 72. Install R15, the other 10k audio pot. 73. Install R2, the 10k stereo audio pot. Now the LEDs. As you may know, LEDs have a polarity just like diodes (they are diodes, light emitting ones) and must be installed correctly to work. The diagram below shows the anode (positive) and cathode (negative) pins of an LED.
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Page 21: Testing Your Ppm3
A stereo or other device that has line level inputs • A microphone • A telephone with phone line attached • A length of standard phone line cable • An RCA cable to connect your line level audio source to the PPM3 •... - Page 22 8. Plug your phone line from the wall jack into the “Telephone Input” on the back of the PPM3. 9. In order to control a phone line you need to connect a phone to the “Telephone Output” of the PPM3. If you lift the receiver on the phone you should be able to hear the dial tone through the unit.
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Page 23: Troubleshooting Guide
TROUBLESHOOTING GUIDE If your PPM3 does not work at all, recheck the following: • correct orientation of VR1 and the ICs (see PC board layout diagram). • You should be able to measure the voltage on the input and output terminals of voltage regulator VR1. - Page 24 known good cables between the stereo, line level source, and PPM3. Try switching cables or using a different cable if you’re having audio trouble. PROBLEM: The microphone doesn’t work. SOLUTION: Test the microphone with another unit to be sure it works on its own.
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Page 25: Specifications
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 also feel free to visit our Website at www.ramseykits.com and offer... - Page 26 PPM3 Page 26...
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Page 27: Warranty
'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 need and proof of kit purchase. -
Page 28: Victor, New York
• Desoldering Braid Ramsey #RTS08 Price: $5.00 Ramsey Publication No. MPPM3 Assembly and Instruction manual for: RAMSEY MODEL NO. PPM3 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com PPM3 REMOTE INTERFACE KIT Quick Reference Page Guide Introduction ...4...