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It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc.
A mono audio signal can be from a microphone and most FM transmitter circuits have enough gain for a microphone. I think I may just leave it in the window.
It appears to me your problems are in the audio feeding it and not the transmitter itself. Posted April 29, If you have good range with the 8 volt supply, use it.
The specs are fine- remember that the amperage is the MAX the power supply can supply- the FM02 will only use the current it needs.
I went ahead and hooked up the 8V power supply after reading another thread that said people have successfully got it working all the way down to 6V and since I knew the 8V supply was clean in the past I went ahead and hooked it up.
It’s the 19Khz pilot level. I b1h415 got good sound from a pc and was so catasheet I could here the real faint pulse of the datwsheet supply so I thought hey I got that other one. I started this topic without any knowledge about b1415 Glad you found the solution and resolved the problem.
In my truck, there’s probably better filtering in that head unit for the pilot tone, and it’s barely noticeable. In some receivers, cheap ones and so so mid grade ones, their filtering is not the greatest and will pass some of that pilot right through the audio chain and into the speakers.
There are days when I think I know what I’m doing with regards to blinky-flashy I tried the FM02 but had problems just my unit, I know others have used them successfully, and ukewarrior has been very helpful with the group buys and support. Solder one lead of the cap to Pin 19 at it’s very end to avoid over-heating the pin. However, I’m not sure there isn’t a cap somewhere on the board, tied to pin Should I run to radio shack and grab ferrit beads for everything?
At least for those who are going through so much trouble. There have been a few changes over the years to the FM02 so I’m curious if any of them ever had the capacitor. You might have some luck with a tunecast, belkin or other short-range transmitter that’s designed to transmit from an iPod or similar mp3 player to a car radio. If you don’t, and the statis is related to the volume of the signal, that changes the focus. Could have damaged your digital devices. It seems to work fine but I’m willing to play with it for grins.
The “shhhhh” issue is not a power supply problem, or audio source problem. It’s ok to have it a little higher than 10 percent, but I would not go any higher than 15 percent.
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Are we trying to set up professional FM Stereo stations here withwatts of radiated power? That is probably the last thing in the pile to look datasheeg. Analog Layout Finger Size 4. That is recognizing good engineering practices and that is also helpful in 10 miliwatt setups for light shows. For systems where wiring is already moved away but there is still hum issues or inductive interference issues onto other devices, use the Radio Shack snap-on chokes on all your wiring, both at the input and output points.
Thank you so much Mac!
BH Datasheet, PDF – Alldatasheet
My question may be very basic, so much so that it seems obvious. James, I’m glad to dstasheet that everything is working out for your show and your got your FM02 today. Dataxheet have a chip capacitor from Pin 19 to ground, and a few of those have too high a value of capacitor for the proper pilot level.
I’ve tried it with a PC power supply — horribly noisy. Some people are trying the blame the antenna. Uke – can you get the schematic for the FM01 as well? VCO uses varicap diode that changes the capacitance as different levels of voltage are applied. Same transmit distance as before, just a nice clean signal.
Could you post that once you receive it so we all can have a copy? The problem is with the lack of adjustment of the pilot level itself and that is done at Pin 19 of the BH chip.
I try an ipod, and it works flawlessly with much better by1415 than my old tunecast. The time now is Dec 242: