开云体育

Neither of Jerry's recommendations are pin for pin replacements. Both of them are recommended for relatively low voltage applications, even though the maximum voltage is given as 15v or so. The idea

Curious. I'm having no trouble down to 1000 khz using the firmware that came with the uBitx when shipped. Jerry

Mouser sells the NJM2073D, seems a reputable manufacturer, should drop in for the TDA2822 There's also the $0.29? UTC? TDA2822 clones on Tayda, they apparently work fine according to reports in the

Ash: I think Arv is right. There are innumerable pairs of NPN/PNP transistors available which will make a good audio amplifier. They are most widely used in TV audio circuits, but appear almost

Ron, May I suggest a separate thread for your issue. Start with a "compose new email" and address it to the group mailto:[email protected] and add an appropriate subject line. This way it becomes

Greetings all, I just put together a micro bitx rig but I'm not getting any audio. The board powers up normally and tunes normally with the encoder. I just have no audio. Any suggestions on where to

https://sites.google.com/site/arvidevans/discretecomponentafamplifier You can build this with a 2N3904 and 2N3906 pair for lower power or use a cheap 4A NPN-PNP pair for 8 watts or so. _._

You have a good chip Arv. Some in my collection work great!

Fokko If you suspect the BPF, try disconnecting it and bypassing it with a 100 pf capacitor. This will get you lots of unwanted signals as well as the desirable ones but it will tell you if the

Jerry, Do I need to use a different firmware to tune that low?? Seems to hit a stop in the 2000khz range. -- Jason Schlager KM6AUS

davidaker There is no error feedback when writing in uBITX yet. What version of uBITX firmware do you use? Do not errors occur when reading? Ian KD8CEC 2018-03-07 3:44 GMT+09:00

Their There They're now. Polite, secure people do not correct other people’s grammar. Fun eh?

Thanks now that its up and running with a new U1 the audio is not bad at all. I guess my issue was the TDA2822 WX. I may still play with it thanks again for the great work Ian. -- David ?N8DAH

I tried to replicate this experiment. I tuned to the local AM station so that there would be some audio for the FCI TDA2822 to amplify.? The rig has an internal 4 ohm speaker.? I turned the radio up

I just tested it in Version 1.9.7 works great. In "general" pick the "FT817" under "Ports" select the port yours shows up as mine was port 4, 38400 Baud, DTR off, RTS TX. If you use winwarbler under

Well, that's life. A pity the 2822 is leaving, it was a good IC. I personally would actually prefer a more modular approach, which would allow users to more easily replace certain parts with something

Change the amplifier to a Class A amp. Do this by reducing R29 until you measure ~7 dBm out of the amplifier. Use an RF probe to make the measurement. As Satish says, that should be about 0.6v RF.

David Thanks for feedback In the uBITX Manager, setting the BFO value to 0 is the factory default value. If the problem is solved by moving the frequency, try adjusting the Master Calibration rather

David, Would that imply DXlabs commander would also work if configured for FT-817? I would be overjoyed if so. Don N9GOD

Here is the story. This is going to cause a lot of heartaches. I chose TDA2822 after listening to a lot of bad press about the LM386. Upon looking at its harmonic distortions et al, it was found to be