| Author |
Message |
amr_electron
Joined: 20 Nov 2004
Posts: 53
|
 20 Nov 2004 3:07 tv receiver |
|
|
|
Any one have any circuit or idea on how to make a tv receiver . I want to apply power & RF signal to the circuit and get BASEBAND video output plus the audio.
REGARDS
|
|
| Back to top |
|
 |
IanP
Joined: 05 Oct 2004
Posts: 6346
Helped: 1505
Location: West Coast
|
| 20 Nov 2004 3:13 Re: tv receiver |
|
|
|
I would suggest that you find yourself an old VCR (must be plenty of faulty VCRs by now) and "extract" HF receiver out of it.
It will have baseband video+audio. There will be couple of things to connect: power (usually around 12Vdc), tunning voltage for tuner (0-33Vdc), band selector...
|
|
| Back to top |
|
|
amr_electron
Joined: 20 Nov 2004
Posts: 53
|
| 20 Nov 2004 4:08 Re: tv receiver |
|
|
|
thank you IanP for your reply,
But i only need a low cost receiver which could consist of an old tuner .
|
|
| Back to top |
|
|
flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
|
| 20 Nov 2004 4:32 Re: tv receiver |
|
|
|
| You might try going to a repair shop to buy one. They probably can sell you one on the spot or order one for you. The complex part is the digital interface you will have to interface to the outside world. There may not be any data sheets on it.
|
|
| Back to top |
|
|
amr_electron
Joined: 20 Nov 2004
Posts: 53
|
| 20 Nov 2004 23:41 Re: tv receiver |
|
|
|
I connected an analoge tuner to a Vtune resistor and a
band selector and got the IF signal out .
What's the next step to get the audio and baseband
video out from the IF signal,
Please post any schematics or INFOs.
Regards
|
|
| Back to top |
|
|
echo47
Joined: 07 Apr 2002
Posts: 4205
Helped: 565
|
| 21 Nov 2004 4:23 tv receiver |
|
|
|
You are probably missing the IF amplifier, the detector, the sound IF amplifier, and the sound detector. Go get the missing pieces.
Or follow IanP's simpler suggestion. Find an old VCR that has video/audio outputs, and you are done. Doesn't matter if the tape transport works or not. You can probably find one for free.
|
|
| Back to top |
|
|
cozturk
Joined: 02 Apr 2002
Posts: 110
|
| 22 Nov 2004 13:37 tv receiver |
|
|
|
Buy a cheap tv card like fly. I purchased about 20$.
Remove the tuner and control it via pic or pic and PC. Audio and video signals ready from the tuner. 33v etc. circuits also . You need only 5v for tuner power. And you have to add 2 buffer for audio and video. The buffers can be done by 1 tr. (BC337 voltage follower current source)
Get PLL IC's I2C protocol from the datasheet. Perhaps TSA5523M. etc.
YES THIS IS STAND A LONE TV RECEIVER.
some ideas here: this is radio only receiver:
http://hem.passagen.se/communication/uv916rec.html
Be happy.
|
|
| Back to top |
|
|
djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
|
| 23 Nov 2004 5:55 Re: tv receiver |
|
|
|
| amr_electron wrote: |
Any one have any circuit or idea on how to make a tv receiver . I want to apply power & RF signal to the circuit and get BASEBAND video output plus the audio.
REGARDS |
ASSUMING you have the antenna part, which you did not mention.
You have not mentioned the standards. What standard?
Also indoor TV or outdoor TV?
Satellite TV or broadcast TV?
plus others (as included) as contrast, tint, RGB circuits, etc?
anyway... here is something if I think it can be helpful. See the picture
|
|
| Back to top |
|
|
amr_electron
Joined: 20 Nov 2004
Posts: 53
|
| 23 Nov 2004 23:30 Re: tv receiver |
|
|
|
It's terresterial transmission, PAL B/G.
The IF output is at 38.9 MHz European Standard.
|
|
| Back to top |
|
|
gecky
Joined: 13 Aug 2004
Posts: 128
Helped: 3
|
| 10 Dec 2004 15:23 Re: tv receiver |
|
|
|
Hi,
sorry for cutting in... but you guys know what are the specs for PAL?
In particular, I need the specs for the PAL output of those miniature CMOS survellience . PAL is 5MHz?
Also, how sensitive is a conventional TV to this signal? (How good the tracking, min power of signal for detection... etc )
I'm building a microwave tx at 6GHz to AM this video sig. So I'd like to see if I'll be able to down-covert the signal (on a receiving patch antenna, mixer and sig gen but without a LNA) to baseband and view the video on a TV.
Currently, I can get a -60+ dBm signal at baseband (seems to 4.5MHz, I not too sure). Don't know if I'm on the right track.... Any advice welcomed 
Many Thanks!
|
|
| Back to top |
|
|
