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You need to be a member in order to leave a comment. The FM02 is pretty sensitive to that. To bad I fried it or I would send it back. Here is a pretty good article about the theory of FM stereo with some links at the bottom about Rohm’s older ICs: Apparently the one he has now after the run of them is working good so far.

BH Datasheet, PDF – Alldatasheet

My issues are sound quality coming from PC I think. RFB Uke as one of the lucky few? Power supply input filtering could use some attention too. This pin adjusts the 19Khz pilot level.

When adjusting the pilot tone level, do this with no modulation. This can throw the resonant frequency off. If you measure continuity between Pin 19 and the solder pad on the unused slot next to the IC itself, this would be where to install the pf capacitor. Thanks I went and got ferrite beads for all the cables today and the sound is much better now.

【BH1415 ROHM】Electronic Components In Stock Suppliers in 2018【Price】【Datasheet PDF】USA

Had I gotten a perfect transmitter done, and nothing in the yard, what good would that have done me? Connect the capacitor between Pin 19 of the BH chip and ground. If there is enough VSWR present along the RF chain, it can cause junky audio and cruddy stereo separation and harmonic distortions causing the sidebands of the modulation to spit and splatter far beyond the Khz deviation, just basically sounding like garbage.


In order to correct this, a proper modulation monitor or O-scope capable bh1451 Mhz or more will be needed to adjust properly. I know using IC will make it easy,but I think that not using IC will help in understanding many concepts Looks like it’s necessary to solder the capacitor directly to datasheett 19 and the far pad.

The down side to switchers is that some can have output “ripple” because of the switching technology. I see in the picture I found, I still don’t have the board in front of me three vias or that’s what they appear to be in that area.

It is not solving it at all, it is merely “covering it up” but it is still there and will always be there until the pilot level is correctly adjusted. It just seems there is no sweet spot in the volume.

I managed to get one but there is no sample schematic in the Datasheet. If your using an external audio processor you bh415 have to dztasheet it so that it does not fight with the IC’s internal processor or the internal IC processor fighting the external one.

I’ll need catasheet google about 13 things just to gh1415 this statement. Is this crkt going to give me nothing or is it worth trying? Create an account or sign in to comment Datashset need to be a member in order to leave a comment Create an account Sign up for a new account in our community. Don’t worry about the current rating of your 12 volt supply. I may be able to help you, my show is going to be a little different this year where I will not be using my FM02, and I would be willing to sell it to you if you really can’t get yours working, I forgot what I paid for it but I would be willing to sell it to you for the same price i paid for it plus PayPal fees and shipping, if you are interested shoot me a PM.


Just trying to be helpful and provide some ideas to the issues being posted. P Just as another note For one, keep the volumne level down.

Last week we did not notice the buzz on the car radio, we do now. I just don’t know what frequencies ddatasheet like what as for filtering, issues, etc. Have turned the volume way dataaheet and up and everywhere in between to see if maybe I was just over diving the audio. A ferrite bead will help a little, but not enough to make a big difference. It is a very rugged, versatile unit.

Can I transmit voice with a stereo transmitter??? Use caution and as little heat as possible when soldering the cap to the pin.

If you don’t, and the statis is related to the volume of the signal, that changes the focus. Sign In Sign Up.