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Pierre_

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About Pierre_

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    Paris, France
  1. Pierre_

    Issue with a 633

    Hello, Thank you for the answers. You were right, with an 7.5 A/C wall adapter, the video is just fine !! Thank you very much to all again for all you help !!! Pierre
  2. Pierre_

    Issue with a 633

    Hi, In fact I don't want to use a lipo 2S, I would like to use the AC 220V reg, as the RX would be near a house (the one that is not working). I have tried with the capacitor I have. I will buy 0,33uF and try again with the reg. The result is almost perfect with the lipo, I like that ! Pierre
  3. Pierre_

    Issue with a 633

    Hello, Some news !! I finally have found the source of my parasites. They came from the 625RX power supply. I am using a cheap AC 230V/DC 6V regulator. If I use a 2S lipo to feed my 7805, it works fine, but with the régulator, I have lines on the video : http://www.dailymotion.com/Pierre__/video/5555027 I have the same regulator on the 633TX, with no pb. But if I use it on the 7805 of the 625RX... So far I have 2 100nF capacitors on the 7805. Any ideas of values for capacitor that would cure this issues, as I would like to use this regulator on the RX side. Thanks, Pierre
  4. Pierre_

    Issue with a 633

    Thanks for you answer. I have grounded the channel 4 of the 625 and haven't modify the 633. Seems fine on a DVM. Should I check with the oscope? On the TX and RX, the resistance value between the antenna pin and the ground is above 20 MOhm. The value is now just below 1 Vpk-pk ?! ? Should I try to ground another channel on the 625 and 633 ? Pierre
  5. Pierre_

    Issue with a 633

    Hello, Some news, I have tried with video and I am quite disapointed by the noise added : First video I have check the Vp-p out of my camera on a 75 ohm resistor, and I have 2V with a light pointing on the lens. Can this cause this kind of noise ? I wasn't able to find on the forum a way to lower the Vp-p of the cam. Can I use 2 resistors to split the voltage in 2 is the good solution, or is there a better way ? Thanks for your help ! Pierre
  6. Pierre_

    Issue with a 633

    Hello, The news. I have wire the 633 on the new power supply, and ground the ch4 on the 625. I just have transmitted sound !!! Thanks you guys very much for your help ! I need to wire the video signal now. I have a amplitude issue, and I need to understand how to lower the voltage from the cam. I have spotted a good thread on that. Pierre
  7. Pierre_

    Issue with a 633

    Hello, Some news. The 317 is working. I have downloaded another version of the 317 datasheet, and I have found a typical value for R1 of 240 Ohm. I was way out. Thanks Thomas for this, I wasn't able to find a typical value in the fairchild datasheet, so I took big resistor to have a low current through them. I have add 100nF cap on the entry and output. Not sure about the 100uF, because I have a 470uF on the output as specified on the 633 datasheet, and the 317 datasheet only suggest a 100nF on the entry ? Right now I have a 4,7 Ohm 2W resistor to simulate the 633 and after 10 minutes, the heatsink mounted on the 317 is hot, but I can hold my finger on it, and the voltage is around 3.26 V. Seems fine. I have checked the value between the video input and the ground on a low scale of my DVM, and it's around 45 Ohm.... Things are going way better. Thank you very much to you all for the support ! So next step is wiring again the 633, put the channel 4 of the 625 to the earth and try it. I will let you know how it goes. Pierre
  8. Pierre_

    Issue with a 633

    Hello, Thank you to you 2. Terry, I have just bought a resistor of 4.7 Ohm and 2 W (big thing), a heat sink (17°C/W) and a new 317 (Mr RC-Cam you are right, the value of the resistor are not correct ?!? I don't understand...). Tonight (1 PM here right now) I will solder a new power supply. Sorry about the picture, if it's still not working, I'll find/buy a camera. Regarding the video input, I'll check that again, I was using the "diod test" position of my DVM maybe it rings below 50 Ohm. Pierre
  9. Pierre_

    Issue with a 633

    I don't have a camera. I have to borrow one, and as it's made on a a test board, it's not really easy to see something. The diagram of the 317 is ok, or am I wrong ? (I know that it's pretty simple, and I checked it several times, but...) I am going to put a load on my 317 with some resistor to check that it can output 600 mA and find a heatsink to mount on it. I will let you know how it behaves. I have to buy some parts (a 5 Ohm resistor able to take 2 W and the heatsink for the 317). I don't understand how I messed up the video entry of the 633, I heated it when I soldered the SMA connector directly on it (as read on the forum), and it was hot, but I was still able to touch it. Pierre
  10. Pierre_

    Issue with a 633

    Hello, Thank you for your answer, they are helping. Seems that I have to order a new 633, and work on my power supply. I can't supply picture, but here's my 317 diagram. The resistor values that I gave are ball park figure, as I have fine tune one of the resistor to obtain 3,3V on the output. One thing is the 317 stay cool when I connect the 633, and the voltage in entry does not go down. I am not able to monitor the intensity (my meter only goes to 200 mA). Thanks, Pierre
  11. Pierre_

    Issue with a 633

    Hello, This is my first post here, and I am french, so sorry if it's not really clear, and please ask me if it's not. I am trying to use a 633 TX and a 625 RX. It's not working (of course ) and I have some questions : - I use a 317 to provide the 3.3V supply to the 633, fed by a 6V supply able to give 1A. With no load, the output of the 317 is 3.3, but with the 633 connected, It falls to 2.2v. Normal ? (To me it's not, the 317 should maintain the voltage but I don't see what wrong with the wiring so maybe something that I havent understood...) - Before I applied the power for the first time, but after having solder the SMA connector directly to the 633 case, the Ohm value (bad english sorry) between the video input and the ground is 0. Again, normal ? - Can I live the channel selection pin to the air on the 633 and the 625 (I don't want to change the channel later, as I am sure to be alone) ? If you have any questions, or checks to suggest, you are welcome !! Thanks, Pierre
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