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Ramsey Electronics SHA1 manual

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Table of contents for the manual

  • Page 1

    SHA1 • 1 STEREO HEADPHONE AMPLIFIER Ramsey Electronics Model No. SHA1 Need a way to listen to line leve l audio from a tape deck or CD player? Need a way of boosting up any lo w level signal to earphone level for top quality stereo listen in g? This kit has CD quality audio capabilities with super low distortion, a wide frequency spectrum, and a [...]

  • Page 2

    SHA1 • 2 RA M SEY TRA NSMIT TER KIT S • FM100B Professional FM Stereo Transmitter • FM25B S ynthesized Stereo FM Transmi tter • MR6 Model Rocket Track ing Transmitter • TV6 Television Tr ansmitter RAMSE Y RECEI VER KI TS • FR1 FM Broa dcast Receiver • AR1 A i rcraft Band Recei ver • SR2 Shortwa v e Receiver • SC1 Shortwav e Conver[...]

  • Page 3

    SHA1 • 3 STEREO HEADPHONE AMPLIFIER KIT Ramsey Publication No . MSHA1 Price $5.00 How does it work . ............ ....... 4 Assembly Strategy ................. 6 Parts List ........... .............. ....... 7 Parts Layout Diagram ............ 8 Part Values Diagram .............. 9 Schematic ........... ............ ....... 10 Assembly Steps ....[...]

  • Page 4

    SHA1 • 4 What is it and how does it w ork? Let’s take a look at the schematic diagram, and we will follow through from input to output to get a general idea how this kit works, and why. W e will look onl y at the left channel circuitry starting at J1 since the right channel is ide ntical to the left. A line level audio signal is placed in J1. L[...]

  • Page 5

    SHA1 • 5 C3 is another coupl in g capacitor, 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 fr om being sent to the earphones. VR1, C15 and C16 supply the regulated DC voltage for the circuit.[...]

  • Page 6

    SHA1 • 6 RAMSEY “LEARN-AS-YOU-BUILD” ASSEM BLY STRATEGY Be sure to read through all of t he steps, and check the bo xes as you go to be sure you didn't mi ss any important steps. Althoug h you may be in a hurry to see re sults, before you switch on the power check all wiring and capacito rs for proper or ientation. Al so check the board [...]

  • Page 7

    SHA1 • 7 SHA1 PARTS LIST Semiconductors  2 LM386 Audio Amplifier ICs (U1,2)  1 1N4002 rectifier diode (Bla ck body with white stripe on one end) (D1)  1 7808 Voltage Regulator (U3) Resistors  2 4.7K ohm resistors (y ellow-violet-red) (R2,7)  2 2 ohm resistors (r ed-black-gold) (R4,8)  2 10K ohm potentiometers (R3,6) Capacitors ?[...]

  • Page 8

    SHA1 • 8 PARTS LAYOUT DI A GR AM[...]

  • Page 9

    SHA1 • 9 PA RT S VA LUE DIA GRA M[...]

  • Page 10

    SHA1 • 10[...]

  • Page 11

    SHA1 • 11[...]

  • Page 12

    SHA1 • 12 AS S EM B L I NG T H E SH A1 H E AD P HO N E AMP L IF I E R S: Sort out all of your parts to begi n with, making sure you have all of the parts required. You can use old egg cartons to hold various parts to make them easie r to find. Make sure to mount parts on the correct side! You will want to use the parts layout diagram to assist yo[...]

  • Page 13

    SHA1 • 13  11. Install U2, one of the LM38 6 audio po wer amplifier ICs. Check the orientation of this ch ip to make sure the dot o r notch representing pin one is in the same direction as shown in the parts diagram. Make su re all eight pi ns are through the board before soldering. Note t hat it is very easy to have a pin folded under the IC [...]

  • Page 14

    SHA1 • 14 usually indicating the negative (-) terminal of the component. You will notice on the parts layout diagram that the hole for the positive terminal is denoted, not the negative one. You will want to install this component wi th the positive (+) lead in the same orientation as shown in th e parts layout diagram. If you do not install it c[...]

  • Page 15

    SHA1 • 15  35. Install C16, 10uF electrolytic capacitor. W atch polarity!  36. Install U3, the 7808 voltage regulator. You will want to bend the center lead out and orient the pa rt so that the writing on the front of the part faces the ou tside of the board. Solder all three leads.  37. Install C15, the last 10uF electrolytic capacitor.[...]

  • Page 16

    SHA1 • 16 TESTING THE SHA1 You will need the following equipment for this test.  Audio source such as signa l generator, C D player, or tape deck.  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 so[...]

  • Page 17

    SHA1 • 17 TROUBLESHOOTING TIPS PROBLEM: No sound out of any c hannel. SOLUTION: Use a DMM to check the power supply voltage, do you have a fresh batt ery? If everything is OK, check your assembly, especially your parts orientation (D1?). Also check your earphones for proper operati on as well as your sound source. PROBLEM: One channel is out , th[...]

  • Page 18

    SHA1 • 18[...]

  • Page 19

    SHA1 • 19 The Ramsey K it Warranty Ple ase r ead ca refully BEFO RE callin g or wr iting i n abou t y our kit. Most pr oblem s can be solv ed without contac ting the fac tory. Notice that thi s is not a "fine prin t " warranty . We want you to u nderstan d your righ ts and ours too ! All Ramsey kits will work if assembl ed properly. The[...]

  • Page 20

    SHA1 • 20 SHA1 STEREO HEADPHONE AMPLIFIER KIT Quick Reference Page Guide How does it work .......... ................. ... 4 Assembly Strategy .................. .......... 6 Parts L ist .................... ................. ...... 7 Parts Layout Diagram ................. ...... 8 Part Values Diagram ........ ................ 9 Schemati c ......[...]