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Ramsey Electronics SHA1 Assembly And Instruction Manual

Manual is about: Ramsey Electronics Stereo Headphone Amplifier Specification Sheet

Summary of SHA1

  • Page 1

    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 d...

  • Page 2

    Sha1 • 2 ramsey transmitter kits • fm100b professional fm stereo transmitter • fm25b synthesized stereo fm transmitter • mr6 model rocket tracking transmitter • tv6 television transmitter ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave receiver • sc1 sho...

  • Page 3: Stereo Headphone

    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 ...............

  • Page 4

    Sha1 • 4 what is it and how does it work? 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. We will look only at the left channel circuitry starting at j1 since the right channel is identical to the left. A ...

  • Page 5

    Sha1 • 5 c3 is another coupling 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 from being sent to the earphones. Vr1, c15 and c16 supply the regulated dc voltage for the circuit..

  • Page 6: Kit Building Tips:

    Sha1 • 6 ramsey “learn-as-you-build” assembly strategy be sure to read through all of the steps, and check the boxes as you go to be sure you didn't miss any important steps. Although you may be in a hurry to see results, before you switch on the power check all wiring and capacitors for proper orie...

  • Page 7: Sha1 Parts List

    Sha1 • 7 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) 2 10k ohm potentiometer...

  • Page 8: Parts Layout Diagram

    Sha1 • 8 parts layout diagram.

  • Page 9: Parts Value Diagram

    Sha1 • 9 parts value diagram.

  • Page 10

    Sha1 • 10

  • Page 11

    Sha1 • 11.

  • Page 12

    Sha1 • 12 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 la...

  • Page 13

    Sha1 • 13 11. Install u2, one of the lm386 audio power amplifier ics. Check the orientation of this chip to make sure the dot or notch representing pin one is in the same direction as shown in the parts diagram. Make sure all eight pins are through the board before soldering. Note that it is very ea...

  • 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 with the positive (+) lead in the same orientation as shown in the pa...

  • Page 15

    Sha1 • 15 35. Install c16, 10uf electrolytic capacitor. Watch polarity! 36. Install u3, the 7808 voltage regulator. You will want to bend the center lead out and orient the part so that the writing on the front of the part faces the outside of the board. Solder all three leads. 37. Install c15, the ...

  • Page 16: Testing The Sha1

    Sha1 • 16 testing the sha1 you will need the following equipment for this test. Audio source such as signal generator, cd 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....

  • Page 17: Troubleshooting Tips

    Sha1 • 17 troubleshooting tips problem: no sound out of any channel. Solution: use a dmm to check the power supply voltage, do you have a fresh battery? If everything is ok, check your assembly, especially your parts orientation (d1?). Also check your earphones for proper operation as well as your s...

  • Page 18

    Sha1 • 18.

  • Page 19: The Ramsey Kit Warranty

    Sha1 • 19 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All ramsey kits will work if assembled...

  • Page 20: Ramsey Model No. Sha1

    Sha1 • 20 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 .......