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Pierre_

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About Pierre_

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    Paris, France
  1. 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. 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. 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. 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. 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. 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. 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 minute
  8. 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. 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 co
  10. 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. 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 f
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