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Ramsey Electronics UAM4SYS Assembly And Instruction Manual

Universal audio amplifier system
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UNIVERSAL
AUDIO AMPLIFIER
SYSTEM
Ramsey Electronics Model No.
The UAM4SYS is a state of the art audio amplifier that utilizes a class
D power amplifier. Professional balanced input is provided along with
an unbalanced line output that can be configured as a buffered input
feed thru or as the "processed", (tone, balance, level) signal to feed
remote locations. All controls use DC or digital levels, eliminating
control noise. Headphone level is provided by a 64 step digital
control with memory. Automatic over temperature protection and
power stage mute is provided. All this in a rugged compact
aluminum case.
FEATURES
•
42 watt class D amplifier (21W per channel stereo mode)
•
0.1% + N distortion
•
Balanced or unbalanced inputs
•
All DC or digital controls for noise free operation
•
Selectable direct or processed (bass, treble, balance, level, loudness) line
outputs
•
Pre-mute headphone output
•
64 step digital headphone level adjustment with level memory
•
Operates on 12 to 18VDC @ 3.3A max power input (up 87% efficient)
•
Quick connect spring terminal output terminals accept 28AWG to 14AWG
wire
•
Selectable 22, 25, 29.5 or 36dB gain
•
Rugged shielded aluminum case
•
Compact profile (5.6in x 6.6in x 1.6in) weighs in at 1.24 lbs (excluding
power supply)
UAM4SYS • 1
UAM4SYS

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  • Page 1 Ramsey Electronics Model No. UAM4SYS The UAM4SYS is a state of the art audio amplifier that utilizes a class D power amplifier. Professional balanced input is provided along with an unbalanced line output that can be configured as a buffered input feed thru or as the “processed”, (tone, balance, level) signal to feed...
  • Page 2 COPYRIGHT 2008-2010 by Ramsey Electronics, LLC, 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, LLC. Printed in the United States of America. UAM4SYS • 2...

  • Page 3: Table Of Contents

    Assembly Steps..........14 Setup and Testing ..........24 Specifications ........... 36 Schematics ..........38-41 Parts Layout Diagram........42 Ramsey Kit Warranty........43 RAMSEY ELECTRONICS, LLC 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com UAM4SYS • 3...

  • Page 4: Theory Of Operation

    C5, C10, C11, and C12 are input coupling capacitors. They provide DC isolation between the input audio device and the UAM4SYS. R11 and R14 provide a 5 volt bias to the op amp buffers. Because the input can be a balanced signal and there is negative feedback applied to the ‘-‘...
  • Page 5 The input buffer allows both unbalanced and balanced input signals to be applied to the UAM4SYS. First we will take an unbalanced signal into the unbalanced input at J4. An unbalanced single is one that uses two conductors, one for the audio signal and one for ground.
  • Page 6 ‘+’ inputs will be tied to ground. This is handy if you have inputs that use separate left and right cables and mono 3.5mm plugs. Also, when using the UAM4SYS in mono mode only the right channel, J2, input is used for mono operation. Again this can then be used either balanced or unbalanced.
  • Page 7 Since pin 7 is +5V, power is applied to the loudness LED on the front panel (sheet 3) through current limiting resistor R28 which lights the LED indicating the UAM4SYS is muted. Line Output Buffer With headers H1 and H2 the user can select either processed (from U3) or unprocessed (directly from input buffers U1A and U1B) audio to be sent to the line outputs.
  • Page 8 U10 is that it remembers where it is set even when the power is removed. So if you turn off the UAM4SYS and then turn it back on the headphone level will be where you left it. Also notice that the signal to the headphones is before the mute function, just like the line output signals, which will be discussed in the ‘Power Amp’...
  • Page 9 The input signal(s) are applied to U7 though C57 and C59. Once the signal reaches the MAX9708 there isn’t a lot more to say other than it amplifies the signal and applies it to the output terminals at T1. SETUP AN UAM4SYS • 9...
  • Page 10 UAM4SYS as either a single 42 watt amplifier if are installed between L+ & R+ and between L+ & R-. If jumpers are not installed between L+ & R+, and between L+ & R-, the UAM4SYS will operate as two 21 amplifiers with the same input signal.

  • Page 11: Learn-As-You-Build" Kit Assembly

    (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. UAM4SYS • 11...
  • Page 12 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 the glue dries, solder the connection. UAM4SYS • 12...

  • Page 13: Parts List

    UAM4SYS PARTS LIST Sort and “check off” the components in the boxes provided. We do our best to pack all our kits correctly but it is possible that a mistake has occurred and we missed a part. Please note that physical descriptions of parts are for those currently being shipped.

  • Page 14: Assembly Steps

    An example of this is the MAX9708 Class D 40 watt audio amplifier IC (U7) used in this kit. Since SMT parts are normally small they can be difficult or impossible to install by hand, so we have installed UAM4SYS • 14...
  • Page 15 Be careful not to disturb the fingers once pressed into place. MOUNTING TAPE BACK SLIDE BOARD IN IB. INPUT BUFFER CIRCUIT 1. Install R15, a 10K ohm resistor (marked Brown, Black, Orange). Resistors have no special polarity so they can be installed in either direction. UAM4SYS • 15...
  • Page 16 13. Install J2, a 3.5mm stereo phone jack. Make sure that this jack and all that follow in this kit sit flat and square to the board before soldering. 14. Install J4, another 3.5mm stereo phone jack. UAM4SYS • 16...
  • Page 17 Solder two pins in opposite corners of the IC. Make sure the IC is flat and square to the board. If not, reheat one pin at a time UAM4SYS • 17...
  • Page 18 3. Install U10, a DS1669 digital rheostat IC (marked DS1669). Install this IC like you did U1 and U3. 4. Install C38, a 0.22uF ceramic capacitor (marked 224). 5. Install C37, another 0.22uF ceramic capacitor (marked 224). 6. Install C45, a 10uF electrolytic capacitor (marked 10uF). Very good UAM4SYS • 18...
  • Page 19 4. Install U6, a CD4066 analog switch IC (marked CD4066). Install this like you did the other IC’s. 5. Install C41, a 0.1uF ceramic capacitor (marked 104). 6. Install C31, another 0.1uF ceramic capacitor (marked 104). 7. Install C32, the last 0.22uF ceramic capacitor (marked 224). UAM4SYS • 19...
  • Page 20 3. Install H5 the last 3 pin header. Install this part just like H4. 4. Install T1 a 4 position spring loaded terminal block. This part must be flush and square to the board before soldering. 5. Install C1, a 1000uF electrolytic capacitor. Remember to watch polarity! UAM4SYS • 20...
  • Page 21 10. Install J7, the other 10 pin dual in-line connector, the same way you installed J40 in the previous step. BA. BOARD ATTACHMENT In order to properly attach the front panel circuit board to the main board part of the case needs to be assembled. UAM4SYS • 21...
  • Page 22 Make sure that the main circuit board front left and right tips (under S1 and J20) touch the back side of the front panel. When you are satisfied that everything is correct UAM4SYS • 22...
  • Page 23 4. Look between the circuit board and case bottom to make sure all leads are short enough so they don’t touch the case bottom. 5. Check the back of the front panel circuit board for solder bridges. UAM4SYS • 23...

  • Page 24: Setup And Testing

    H2 so that pins 2 and 3. Set these jumpers to pins 1 to 2 for testing. 2. Set the MONO jumper on H3. If you wish your UAM4SYS to operate in stereo mode place the jumper on only one pin of H3. This is just to keep the jumper with the kit so in case you need it in the future you will have it.
  • Page 25 2. Ring: Right-hand channel for stereo signals, negative phase for balanced mono signals. 3. Tip: Left-hand channel for stereo signals, positive phase for balanced mono signals, signal line for unbalanced mono signals 4. Insulating rings Tip-Ring-Sleeve Jack Plug UAM4SYS • 25...
  • Page 26 DO NOT for any reason short the speak wires. If you are going to use your UAM4SYS in single channel mono mode, connect the output lines together on the circuit board at the locations provided near T1.
  • Page 27 Verify the mute and loudness LED’s are off. Turn on power switch S1. The power LED, D4, should illuminate. Slowly rotate the volume control. Listen for clean audio from the speakers. Press the MUTE switch. Verify the speaker audio mutes and the mute UAM4SYS • 27...
  • Page 28 FINAL CASE ASSEMBLY Now that we have the UAM4SYS operating we’ll complete the case assembly. 1. Locate the top cover. In order to assure a good ground connection between the cover and the case bottom for noise shielding purposes we need to make a slight adjustment to the cover.
  • Page 29 2.Check VR2’s output resistance, if it is close to 0 ohms check for shorts on all of the 5V foil runs on the circuit board. If the resistance is higher than 5 ohms but less than 5k ohms check IC orientations. UAM4SYS • 29...
  • Page 30 U1. Also check that C13 and C14 are installed correctly. 4. Use the headphone test jig to check for signal on pins 8 and 14 of U1. If no signal is present check the signal path between these pins UAM4SYS • 30...
  • Page 31 This is the only ‘signal’ that is common to all these functions. If the voltage is not correct go to step 2. 2. Check the entire circuit path for short circuits from U3 pin 17 on UAM4SYS • 31...
  • Page 32 Treble control only not functioning properly Checks: 1. Measure the voltage on U3 pin 17, [READING = 5.4VDC] If correct go to step 2, otherwise go to the “Improper operation of bass, treble, balance, loudness and volume controls” troubleshooting section. UAM4SYS • 32...
  • Page 33 5.4VDC] If not correct go to step 3 otherwise re-solder the connection on R20. 3. While adjusting R20 measure the voltage on the center connection of R20. [READING varies between 0 and 5.4VDC] If correct measure the voltage on U3 pin 12 while adjusting R20. UAM4SYS • 33...
  • Page 34 [READING = +5VDC +/-0.02VDC] If good go to step 6. Otherwise check all connections and components between these pins and the +5 volt supply for open and short circuits and correct installation. 2. While measuring the voltage at U5 pin 4(12) press the loudness UAM4SYS • 34...
  • Page 35 JP1 and JP2 is installed. If you are using the UAM4SYS in single channel mono mode make sure you have installed the jumpers between “L+” and “R+” and “L-“ and “R-“ correctly, H3 is installed and you are applying the input signal to the RIGHT input channel. Other than the surface mounted capacitors and resistors there is nothing else you can repair without specialized soldering equipment.

  • Page 36: Specifications

    (4 ohm load, THD = 10%) Controls/Indicators: Front Panel: Main audio: Bass, Treble, Balance, Volume Headphone: Digital 64 step up/down level buttons with memory Mute: Digital push button with LED indicator Loudness: Digital push button with LED indicator UAM4SYS • 36...
  • Page 37 MAX9708 Junction Temperature 139 (degrees C) Dimensions: Board 5.28in x 6.2in x 1.21in (13.2cm x 15.75cm x 3.1cm Case 5.6 in x 6.6 in x 1.6 in (14.22cm x 16.76cm x 4.1cm) (shielded aluminum) Weight: 1.24lbs (.567kg) UAM4SYS • 37...

  • Page 38: Schematics

    Schematic Sheet 1/4—Input Processing UAM4SYS • 38...
  • Page 39 Schematic Sheet 2/4—Control and Headphone Amps UAM4SYS • 39...
  • Page 40 Schematic Sheet 3/4—Front Panel UAM4SYS • 40...

  • Page 41: Schematics

    Schematic Sheet 4/4—Power Amp UAM4SYS • 41...

  • Page 42: Parts Layout Diagram

    Parts Layout UAM4SYS • 42...

  • Page 43: Ramsey Kit Warranty

    “1K ohm” resistors are actually the “missing” 10 K parts ("Hum-m-m, I guess the orange band really does look red!") Ramsey Electronics project kits are packed with pride in the USA by our own staff personnel.
  • Page 44 • OptiVisor Magnifier • Tweezers RAMSEY ELECTRONICS, LLC Manual Price Only: $5.00 590 Fishers Station Drive Ramsey Publication No. UAM4SYS Assembly and Instruction manual for: Victor, New York 14564 Phone (585) 924-4560 RAMSEY MODEL NO. UAM4SYS (585) 924-4555 UNIVERSAL AUDIO AMP SYSTEM www.ramseykits.com...

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