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SHA1

 1  

STEREO 
HEADPHONE 
AMPLIFIER

 

Ramsey Electronics Model No.        SHA1 

Need a way to listen to line level audio from a tape deck or CD 
player? Need a way of boosting up any low level signal to 
earphone level for top quality stereo listening? This kit has CD 
quality audio capabilities with super low distortion, a wide 
frequency spectrum, and a superior signal to noise ratio!  

Uses the LM386 audio amplifier ICs. 

Better than 100dB Signal to noise ratio. 

10Hz to 100kHz power spectrum (+-3dB) 

Almost 1W output per channel when run on 9V battery 

Accepts mike or line level 

Handy phono type input, and 1/4” stereo headphone output 

Operates on 9 to 15 volts DC 

Independent left and right volume controls 

Super easy hook-up with push-button sibilance filter. 

Informative manual answers questions on theory, hookups and 
uses - enhances resale value, too! 

Add our custom case and Knob set for a finished “Pro” look. 

Summary of Contents for SHA1

Page 1: ...rior signal to noise ratio Uses the LM386 audio amplifier ICs Better than 100dB Signal to noise ratio 10Hz to 100kHz power spectrum 3dB Almost 1W output per channel when run on 9V battery Accepts mike...

Page 2: ...DIO KITS DDF1 Doppler Direction Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator QRP Power Amplifiers RAMSEY MINI KITS Many other kits ar...

Page 3: ...Strategy 6 Parts List 7 Parts Layout Diagram 8 Part Values Diagram 9 Schematic 10 Assembly Steps 12 Testing the SHA1 16 Troubleshooting 17 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR RAMSEY ELECTRONICS IN...

Page 4: ...ifier capable of driving low impedance loads It requires very few external components runs very efficiently and has great fidelity With the sibilance switch open the audio passes directly into U1 and...

Page 5: ...pacitor and it serves the same purpose as C1 at the start of the circuit This prevents the DC portion of the signal on the output of U1 from being sent to the earphones VR1 C15 and C16 supply the regu...

Page 6: ...gently heat the traces to which you are soldering heating both wires and pads simultaneously Apply the solder on the iron and the pad when the pad is hot enough to melt the solder The finished joint s...

Page 7: ...gold R4 8 2 10K ohm potentiometers R3 6 Capacitors 5 01uF ceramic capacitors Marked 01 10n or 103 C4 8 10 12 14 4 10uF electrolytic capacitors C1 6 15 16 1 470uF to 1000uF capacitor C2 2 220uF capaci...

Page 8: ...SHA1 8 PARTS LAYOUT DIAGRAM...

Page 9: ...SHA1 9 PARTS VALUE DIAGRAM...

Page 10: ...SHA1 10...

Page 11: ...SHA1 11...

Page 12: ...c capacitor Marked 01 10n or 103 4 Install R2 a 4 7K ohm resistor yellow violet red 5 Install R7 another 4 7K ohm resistor yellow violet red 6 Using a scrap piece of component lead install JMP2 These...

Page 13: ...scrap piece of component lead install JMP5 Note that this part does not need to be bent as shown in the diagram just make sure that it is installed in the correct holes 16 Install C4 a 01uF ceramic ca...

Page 14: ...rientation 25 Install C6 a 10uF electrolytic capacitor Orientation 26 Install C1 the remaining 10uF electrolytic capacitor 27 Install J3 the 1 4 earphone jack Make sure all the pins are soldered for g...

Page 15: ...e to orient the cap as the silkscreen shows 38 Install the battery connector by soldering the black wire into the hole marked and the red wire into the hole marked 39 Install J4 the power jack Well it...

Page 16: ...olt battery or DC power supply Simply connect your SHA1 up as if you were going to use it 1 Connect your signal source to the two RCA jacks on the SHA1 2 Hook up the 9V battery or power supply 3 Turn...

Page 17: ...s OK SOLUTION You may have a short or open somewhere through the circuit This is where an oscilloscope would come in handy Insert an audio signal into both of the inputs then trace through the circuit...

Page 18: ...SHA1 18...

Page 19: ...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...

Page 20: ...ED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pliers Ramsey MPP4 or RTS05 Small Diagonal Cutters Ramsey RTS04 OR Technician s Tool Kit TK405 ADDITIONAL SUGGESTE...

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