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SUPER STEREO
HEADPHONE
AMPLIFIER KIT
Ramsey Electronics Model No.
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.
•
Separate volume, treble, bass, balance and loudness
•
Signal level clipping indicator LED
•
Stereo loop-through for multiple feeds with separate controls
•
CD quality audio
•
Runs on a 9 volt battery or 12 to 20 VDC external power
SHA2 • 1
SHA2
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Related Manuals for Ramsey Electronics SHA2
Summary of Contents for Ramsey Electronics SHA2
- Page 1 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.
- Page 2 2005 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. March 2006...
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Page 3: Table Of Contents
Ramsey Publication No. SHA2: Manual Price Only $5.00 INSTRUCTION MANUAL FOR SUPER STEREO HEADPHONE AMP TABLE OF CONTENTS Circuit Description... 4 “Learn as you Build”... 8 Parts List... 9 Parts Layout Diagram ... 10 Assembly Steps ... 11 Schematic ... 12 Setup and Testing... -
Page 4: Circuit Description
The capacitor lets the audio pass through to pin 19(2) of U3, an LM1036, which is the tone/volume/balance control IC. This IC can be thought of as the heart of the SHA2. It provides control of all the major functions of the unit including volume, tone, balance and loudness. - Page 5 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 such as additional SHA2 units, your tape recorder, etc. The isolation feature prevents the additional devices from interfering with the original input signal.
- Page 6 Let’s say that you want to use your SHA2 to listen to the record level output of your amplifier because it does not have a headphone jack but you also want to be able to record the program you are listening to.
- Page 7 It is not a good idea to attempt to charge a battery, in fact it can cause a battery to explode, if the battery is not designed to be charged. NEVER attempt to charge a standard alkaline or carbon/zinc battery. SHA2 • 7...
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Page 8: Learn As You Build
(2-4), and the remaining lead length is then clipped off (5). Notice how the solder joint looks close up, clean and smooth with no holes or sharp points (6). SHA2 • 8... -
Page 9: Parts List
SHA2 PARTS LIST CAPACITORS 5 10 nF ceramic disc capacitors [marked 103] (C3,13,15,21,25) 2 100nF ceramic disc capacitors [marked 104] (C14,27) 2 100pF ceramic disc capacitors (marked 100, 101, or 101K ) (C11,23) 4 220nF ceramic disc capacitors (marked ) (C6,7,8,26) -
Page 10: Parts Layout Diagram
SHA2 PARTS LAYOUT DIAGRAM SHA2 • 10... -
Page 11: Assembly Steps
The PC board silkscreen shows a “+” sign next to one of the holes for the part. This corresponds to the longer of the two leads, the positive. The negative SHA2 • 11... -
Page 12: Schematic
SHA2 • 12... - Page 13 SHA2 • 13...
- Page 14 I don’t want to bug you about it. Install C13, the last 10nF ceramic disc capacitor (marked 103). Install C10, 10uF electrolytic capacitor. Polarity. Install C11, 100pF ceramic disc capacitor (marked 100, 100K, or 101). SHA2 • 14...
- Page 15 Install D2, 1N4000 series diode. Again, follow the white band on the board and on the part for orientation. Install R3, 1 M ohm resistor (that’s a million ohms!) (brown-black-green). SHA2 • 15...
- Page 16 Hmmm, kind of dating myself now, huh? Ok, let’s get back to building! Locate the DPDT switch and install it in the S1 position. Happily, I have no SHA2 • 16...
- Page 17 = negative lead Leave these leads as short as possible PC Board Side view SHA2 • 17 front of PC board...
- Page 18 Bridges can be dangerous to your circuit. Be sure none of your clipped off wires have lodged between the connections on the back. When you’re satisfied we’ll move on and give your headphone amp a try. SHA2 • 18...
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Page 19: Setup And Testing
3. Connect your DC supply or 9 volt battery. 4. Turn on your line level source. 5. Turn on your SHA2. The LED, D3, should light and then go out after a few seconds. Turn the volume up to a comfortable level. - Page 20 Simply plug the buffered output of the first SHA2 into the line level input of the second SHA2. Now you have 4 headphone jacks all on the same “channel”, all hearing the same audio. Think of the possibilities for long car trips.
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Page 21: Troubleshooting
Check your headphones on a different source to be sure they aren’t the problem. This is also a good thing to do if the SHA2 seems noisy because it’s probably not the kit but may well be a poor connection inside the headphones. - Page 22 Please submit comments or ideas to: Ramsey Electronics Inc. Attn. Hobby Kit Department 590 Fishers Station Drive Victor, NY 14564 or email us at: techsupport@ramseymail.com And once again, thanks from the folks at Ramsey! SHA2 • 22...
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Page 23: Warranty
'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 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 24: Victor, New York
Assembly and Instruction manual for: SHA2 • 24 Super Stereo Headphone Amplifier TOTAL SOLDER POINTS ESTIMATED ASSEMBLY TIME Beginner... 3 hrs Intermediate... 1.5 hrs Advanced ... 1 hr Manual Price Only: $5.00 Ramsey Publication No. SHA2 RAMSEY MODEL NO. SHA2...