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VEC-841K Owner's Manual

Tunable SSB/CW Audio Filter Kit

Содержание VEC-841K

Страница 1: ...ific part is no longer available or if Engineering has determined that an alternative component is more suitable Vectronics reserves the right to make substitutions at any time In most cases these cha...

Страница 2: ...it well and include the minimum payment plus shipping and handling charges 25 00 total No work can be performed without pre payment Also provide a valid UPS return address and a day time phone number...

Страница 3: ...construction requires a clean smooth and well lighted area where you can easily organize and handle small parts without losing them An inexpensive sheet of white poster board makes an excellent constr...

Страница 4: ...orm when a trail of excess solder shorts pads or tracks together see Solder Tips below 4 Omitting or Misreading a Part This is easier to do than you might think Always double check to make sure you co...

Страница 5: ...Digit 2nd Digit Multiplier Tolerence Black 0 tens Brown 1 hundreds Red 2 K Orange 3 10K Yellow 4 100K Green 5 1Meg Blue 6 Violet 7 Gray 8 White 9 Silver 10 Gold 5 Resistor Color Code gold or silver Wh...

Страница 6: ...stors Electrolytic capacitors are always marked in uF Electrolytics are polarized devices and must be oriented correctly during installation If you become confused by markings on the case remember the...

Страница 7: ...ease go through the parts bag to identify and inventory each item on the checklist before you start building If any parts are missing or damaged refer to the warranty section of this manual for replac...

Страница 8: ...olystyrene capacitors 1000J C5 C6 C7 C8 1 100uF electrolytic capacitor C12 2 470uF electrolytic capacitor C11 C14 1 10uF electrolytic capacitor radial leads C13 2 10uF electrolytic capacitor axial lea...

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Страница 10: ...ild your kit please refer back to the section titled Tools and Supplies If you re ready to begin now here we go The directions use two sets of check boxes Check one when a step is complete and use the...

Страница 11: ...let red Carefully bend the leads close to the resistor body as in Step 1 Insert at R18 solder in place and trim the leads 12 Locate resistor R33 This is a 4 7K resistor yellow violet red Carefully ben...

Страница 12: ...yellow orange Carefully bend the leads close to the resistor body as in Step 1 Insert at R3 solder in place and trim the leads 24 Locate resistor R22 This is a 24K resistor red yellow orange Carefully...

Страница 13: ...re made of a polystyrene type material Avoid overheating these components when soldering to prevent melting the capacitor body 1 Locate capacitor C5 1000pF The is a polystyrene capacitor and will be m...

Страница 14: ...horizontal trimpot 4 Insert R24 into its mounting holes until it stops making sure that all three 3 legs are inserted into the board Bend the legs outward to secure the part to the board Solder in pla...

Страница 15: ...ate capacitor C10 10uF This is an electrolytic capacitor and will be marked 10uF actual value in uF Capacitor C10 is the type of capacitor with leads coming out of the ends of the component like a res...

Страница 16: ...agram for the location of points JMP7A and JMP7B Once installed solder in place and trim the leads 13 Locate the remaining piece of the 6 insulated wire Measure and cut one 1 piece 1 long then remove...

Страница 17: ...iagram for proper orientation Be sure not to bend any of the pins underneath the IC body and that all pins are inserted into the socket 6 Locate the LM380 audio amplifier integrated circuit Insert it...

Страница 18: ...ue used Start at one side of the board and work your way across in an organized pattern Inspect the solder side of the board for cold solder joints and solder bridges between tracks or pads Use a magn...

Страница 19: ...follow each step as it is written and laid out for you This will ensure that filter will perform well Well if you are ready then let s get started Test Equipment Needed The following is the test equip...

Страница 20: ...dure This here is the actual test and alignment procedure Please follow each step as it is written and laid out for you This will ensure that the procedure is done correctly Important Note If you are...

Страница 21: ...Frequency control R26 on the VEC 841K set the signal displayed on the scope to it s absolute MINIMUM amplitude 14 Set SW1 on the VEC 841K to the OUT position PEAK 15 Using the small plastic alignment...

Страница 22: ...hone jack J4 which requires an RCA phono plug The center pin of the RCA phono is positive while the outer shell is ground Next connect the POSITIVE lead of the external speaker to the TIP of a 3 5mm m...

Страница 23: ...an actually notch or null out nearby adjacent signals and interference You can also use a pair of mono headphones with a 1 4 mono plug attached Connect your headphones to the phones jack J5 IN CASE OF...

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Страница 26: ...VEC 841K Owner s Manual Tunable SSB CW Audio Filter Kit 24...

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