Hi,
I am making a single transistor TV transmitter on VHF using the instructions at Micro Silent TV How to build the most simplest TV transmitter?
On first look, the circuit diagram uses non-standard conventions but I decided to try nevertheless. I am using the version on the bottom of the page
**broken link removed**
It took me half an hour to assemble it on a perf board. The circuit showed working signs upon first power on using the composite output from a DVD player. The TV detected a distorted image, obviously from my transmitter. Took me another 1 hour to adjust the trimmer resistors/capacitors to get a snowy but somewhat watchable display on my TV. The display is not distorted, in fact text from the DVD player are readable. The colors are also correct. The only problem is the snow and some artifacts on the display. Moving the transmitter closer to the TV does not help - in fact the same picture remains with the transmitter as far as 10m from the TV.
I am using a 2N3904 transistor and a 1k trimmer as I do not have a 500R trimmer. All other values are exact.
My TV is made around 1998. It has VHF/UHF with PAL/SECAM/NTSC. It supports both auto scan and manual scanning using the "+" and "-" key on the remote controller. In fact, the transmitter frequency is detectable using auto-scan.
Any ideas how I can improve the quality? Or is this simply the quality of this transmitter, or is my TV just not sensitive enough?
I am making a single transistor TV transmitter on VHF using the instructions at Micro Silent TV How to build the most simplest TV transmitter?
On first look, the circuit diagram uses non-standard conventions but I decided to try nevertheless. I am using the version on the bottom of the page
**broken link removed**
It took me half an hour to assemble it on a perf board. The circuit showed working signs upon first power on using the composite output from a DVD player. The TV detected a distorted image, obviously from my transmitter. Took me another 1 hour to adjust the trimmer resistors/capacitors to get a snowy but somewhat watchable display on my TV. The display is not distorted, in fact text from the DVD player are readable. The colors are also correct. The only problem is the snow and some artifacts on the display. Moving the transmitter closer to the TV does not help - in fact the same picture remains with the transmitter as far as 10m from the TV.
I am using a 2N3904 transistor and a 1k trimmer as I do not have a 500R trimmer. All other values are exact.
My TV is made around 1998. It has VHF/UHF with PAL/SECAM/NTSC. It supports both auto scan and manual scanning using the "+" and "-" key on the remote controller. In fact, the transmitter frequency is detectable using auto-scan.
Any ideas how I can improve the quality? Or is this simply the quality of this transmitter, or is my TV just not sensitive enough?
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