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Summary of Contents for Velleman K4601
- Page 1 Total solder points: 131 Difficulty level: beginner 1 advanced AUDIO / VIDEO MODULATOR K4601 ILLUSTRATED ASSEMBLY MANUAL H4601IP-2...
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Page 3: Specifications
Features & Specifications If it is desired to connect a video signal originating from a camera or other video source to a normal TV set, you will need this modulator. The audio and video signal is converted into a UHF TV signal so that the signal can be received through the TV antenna input. - Page 4 Assembly hints 1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: • A good quality soldering iron (25-40W) with a small tip.
- Page 5 AXIAL COMPONENTS ARE TAPED IN THE CORRECT MOUNTING SEQUENCE ! REMOVE THEM FROM THE TAPE ONE AT A TIME ! You will find the colour code for the resistances and the LEDs in the HALG (general manual) and on our website: http://www.velleman.be/common/service.aspx...
- Page 6 Construction 1. Zener diodes. Watch the Resistors 4. Choke. 1/4W polarity ! R... L... L... ZD1 : 11V L5 : 10µH (1 - 0 - 0 - A) ZD2 : 6V2 CATHODE 5. Capacitors c... R2 : 100 (1 - 0 - 1 - B) R3 : 560 (5 - 6 - 1 - B) R4 : 1K...
- Page 7 Construction C13 : 180pF (181) 8. High frequency inductors C14 : 470pF (471) Cut 3 lengths of the 0.6mm wire supplied to the exact length. C15 : 1nF (102) Scrape the enamel off the ends of each length of wire with a sharp C16 : 1nF (102) knife for about 5 mm and tin the ends.
- Page 8 Construction 9. Transistors 12. RCA connectors 15. Antenna connector T1 : BC547B J1 : Audio : RF (!) J... T2 : MPSH10 J2 : Video T3 : MPSH10 13. Electrolytic Capacitors Watch the polarity ! 10. Switch. 16. LED. Watch the polarity! C20 : 4µ7 SW...
- Page 9 Construction Insert the red LED into the housing as in the drawing. Anode Fig 5.0 Solder them together Cathode Pay attention to the polarity! Now connect the two wires with the pins of the LED, respect the polarity! Fig 6.0...
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Page 10: Lock Washer
Construction 17. High frequency transistor 18. Fitting inside the housing T4 : BFR90 Attach the sticker giving the connection information to the back of the housing. Mount the 3 threaded rods on the bottom of the housing, together with a tooth lock washer and M3 countersunk-head bolts (see figure 8.0). - Page 11 Test and setup 19. Test and setup Preparation: Set trimmer potentiometers RV1 (audio) and RV2 (video) to a maximum (completely clockwise). Set the frequency trimmer capacitor, CV1, to the middle of its range. Carefully turn the core of L4 completely down using a suitable screwdriver. Put the housing cover into place.
- Page 12 Test and setup Adjusting the picture: Set the TV set to "search" on the UHF band until a clear picture is obtained. If a clear picture cannot be obtained then try turning the trimmer capacitor to a different setting (turn 1 to 2 mm per test). "Expand"...
- Page 13 Test and setup The modulation of the video signal can be further adjusted using trimmer potentiometer RV2. NOTE: The above instructions for setting the received picture are only guidelines. A little experimentation with the setting of the frequency capacitor, CV1, and also variations in inductor L2 and potentiometer RV2 can greatly improve the picture quality.
- Page 14 Diagram 20. DIAGRAM...
- Page 15 21. PCB...
- Page 16 VELLEMAN Components NV Legen Heirweg 33 9890 Gavere Belgium Europe www.velleman.be www.velleman-kit.com Modifications and typographical errors reserved © Velleman Components nv. H4601IP - 2004 - ED2 5 4 1 0 3 2 9 2 9 0 4 1 2...
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