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STEREO
HEADPHONE
AMPLIFIER
Ramsey Electronics Model No.
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!
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Uses the LM386 audio amplifier ICs.
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Better than 100dB Signal to noise ratio.
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10Hz to 100kHz power spectrum (+-3dB)
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Almost 1W output per channel when run on 9V battery
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Accepts mike or line level
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Handy phono type input, and 1/4" stereo headphone output
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Operates on 9 to 15 volts DC
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Independent left and right volume controls
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Super easy hook-up with push-button sibilance filter.
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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.
SHA1• 1
SHA1
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Summary of Contents for Ramsey Electronics SHA1
- Page 1 STEREO HEADPHONE AMPLIFIER Ramsey Electronics Model No. 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...
- Page 2 1995 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. Printed in the United States of America. First printing: September 1995...
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Page 3: Table Of Contents
Parts List ... 7 Parts Layout Diagram ... 8 Part Values Diagram ... 9 Schematic ... 10 Assembly Steps ... 12 Testing the SHA1 ... 16 Troubleshooting ... 17 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 SHA1•... -
Page 4: How Does It Work
LM386. This makes the load of the speaker look more like a resistive one than inductive, which prevents “motorboating” of the audio signal. SHA1 • 4... - Page 5 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 regulated DC voltage for the circuit. SHA1• 5...
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Page 6: Assembly Strategy
(1). The part is then soldered securely to the board (2-4), and the remaining lead length is then clipped off (5). Notice how the solder joint looks on close up, clean and smooth with no holes or sharp points (6). SHA1 • 6... -
Page 7: Parts List
SHA1 PARTS LIST Semiconductors 2 LM386 Audio Amplifier ICs (U1,2) 1 1N4002 rectifier diode (Black body with white stripe on one end) (D1) 1 7808 Voltage Regulator (U3) Resistors 2 4.7K ohm resistors (yellow-violet-red) (R2,7) 2 2 ohm resistors (red-black-gold) (R4,8) -
Page 8: Parts Layout Diagram
PARTS LAYOUT DIAGRAM SHA1 • 8... -
Page 9: Part Values Diagram
PARTS VALUE DIAGRAM SHA1• 9... -
Page 10: Schematic
SHA1 • 10... - Page 11 SHA1• 11...
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Page 12: Assembly Steps
ASSEMBLING THE SHA1 HEADPHONE AMPLIFIERS: Sort out all of your parts to begin with, making sure you have all of the parts required. You can use old egg cartons to hold various parts to make them easier to find. Make sure to mount parts on the correct side! You will want to use the parts layout diagram to assist you in finding where the parts go. - Page 13 21. Install JMP4 using a scrap piece of component lead. 22. Install C2, a 470uF to 1000F electrolytic capacitor. Make sure and mount this part in the correct direction! If you look at the component you will see a stripe down one side, SHA1• 13...
- Page 14 34. Using a scrap piece of component lead, make a jumper that mounts through the holes where the battery is to be mounted. Thread the jumper through the metal 9V battery holder and then solder the jumper to mount the clip to the PC board. SHA1 • 14...
- Page 15 Check all of your solder joints for cold solder connections, and then check all of your traces and pads for any solder bridges. Last of all check the orientation of all your parts against the parts layout diagram. SHA1• 15...
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Page 16: Testing The Sha1
RCA jacks to feed audio to the SHA1 Good quality headphones. A 9 volt 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. -
Page 17: Troubleshooting
PROBLEM: Sound is terrible or “motorboating” SOLUTION: Check your power supply voltage or your battery. PROBLEM: I just can’t get the #@%*$#&! thing to work! It’s Ramsey’s fault! SOLUTION: Read the warranty information towards the back of this manual. SHA1• 17... - Page 18 SHA1 • 18...
- Page 19 '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...
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Page 20: Fishers Station Drive Victor, New York
590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com SHA1 STEREO HEADPHONE AMPLIFIER KIT Quick Reference Page Guide How does it work ... 4 Assembly Strategy ... 6 Parts List ... 7 Parts Layout Diagram ... 8 Part Values Diagram ...