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SHA2 

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 1  

SUPER STEREO 

HEADPHONE 

AMPLIFIER KIT

 

Ramsey Electronics Model No.          SHA2 

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Separate volume, treble, bass, balance and loudness 

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Signal level clipping indicator LED 

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Stereo loop-through for multiple feeds with separate controls 

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CD quality audio 

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Runs on a 9 volt battery or 12 to 20 VDC external power 

 

Want to listen to your audio source with headphones but the 
manufacturer provided no headphone output? No problem; 
simply connect the line level output to the input on the SHA2, 
connect your stereo headphones, and you’re all set! This is the 
next generation headphone amp with the ability to connect 
multiple outputs and with more control options than our SHA1.   

Summary of Contents for SHA2

Page 1: ...quality audio Runs on a 9 volt battery or 12 to 20 VDC external power Want to listen to your audio source with headphones but the manufacturer provided no headphone output No problem simply connect t...

Page 2: ...y LTS1 Laser Trip Sensor ICI1C Infrared Switch Control Interface RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers DDF1 Doppler Direction Finder Kit QRP Series HF CW Transmitters and QAMP Powe...

Page 3: ...it Description 4 Learn as you Build 8 Parts List 9 Parts Layout Diagram 10 Assembly Steps 11 Schematic 12 Setup and Testing 19 Troubleshooting 21 Warranty 23 INSTRUCTION MANUAL FOR RAMSEY ELECTRONICS...

Page 4: ...ce this is a stereo system R9 R10 R11 and R12 are the volume tone and balance controls These functions are controlled by U3 with a DC voltage applied to the respective control pins This voltage is sup...

Page 5: ...to light D3 is not grounded through the low output The looping buffer The purpose of this circuit is to provide a signal which is identical to but isolated from the input signal to feed other devices...

Page 6: ...the direct input feed to the SHA2 or the output of the LM1036 processor By connecting a jumper between pins 1 and 2 of the headers the buffered output is simply whatever the input is If the jumper is...

Page 7: ...ode to which the arrow points in the schematic or the end with a band or mark on it in the actual device The anode is the other side The cathode likes to be negative with respect to the anode Anyway y...

Page 8: ...t 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...

Page 9: ...5 6 8 13 1 100k ohm resistor brown black yellow R15 1 560k ohm resistor green blue yellow R17 4 1M ohm resistors brown black green R1 2 3 4 SEMICONDUCTORS 3 IN4000 series diodes IN4000 to IN4004 black...

Page 10: ...SHA2 10 SHA2 PARTS LAYOUT DIAGRAM...

Page 11: ...is sitting flat on the board before soldering all the pins In the same way install U2 and U4 the LM386N low voltage audio power amplifiers Orient the notched ends and check placement before soldering...

Page 12: ...SHA2 12...

Page 13: ...SHA2 13...

Page 14: ...220nF ceramic disc capacitor marked 224 Install C17 10uF electrolytic capacitor Remember the polarity when installing Install C7 220nF ceramic disc capacitor marked 224 Install C19 390nF ceramic disc...

Page 15: ...another polarity sensitive component The white band on the part and the white band shown on the silkscreen need to line up with each other Solder as usual Install R17 560k ohms green blue yellow Insta...

Page 16: ...lead hole Install C31 10uF electrolytic capacitor and this is the last time you ll have to hear about polarity and orientation Refreshing isn t it Install R18 470 ohms yellow violet brown between J2...

Page 17: ...eter It s different from the other three and easy to spot Before we install R10 we d better install D3 the mini red LED The part has a flat side and a flat edge is shown on the PC board for orientatio...

Page 18: ...oard That s it But wait before you grab a battery and fire up your kit let s check a few things Mainly check the orientation of the ICs diodes and all those electrolytics We don t want anything to go...

Page 19: ...d right set where you want it 7 Try out the treble control R10 and the bass control R11 and set them for the sound you want 8 Next try pressing in S1 the loudness control You should hear the differenc...

Page 20: ...ine level source has been changed and now matches what you re hearing through the headphones That s about it You re ready to start using your SHA2 One last thought about the buffered output You can us...

Page 21: ...r is positive especially if you didn t get it from Ramsey A meter isn t the best way to test a battery but it will tell you if a 9 volt is beyond hope A battery tester will put the battery or cell und...

Page 22: ...ave tried to compose our manual in the easiest most user friendly format possible As our customers we value your opinions com ments and additions that you would like to see in future publications Plea...

Page 23: ...and received five extra 1K resistors you can pretty 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 Electronic...

Page 24: ...nual Price Only 5 00 Ramsey Publication No SHA2 Assembly and Instruction manual for RAMSEY MODEL NO SHA2 Super Stereo Headphone Amplifier REQUIRED TOOLS Soldering Iron WLC100 Thin Rosin Core Solder RT...

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