开云体育

Umm, yes. If you wire the phone jack such that the audio out is going to both tip and ring, then plug in a mono plug with just tip (and sleeve at ground), then the audio out gets shorted to ground,

Farhan Possibly use an op-amp for the audio pre-amp and follow it with an NPN-PNP pair. Feedback from the NPN-PNP cathodes to input of the op-amp (with resistive divider to set gain) and you have a

Ron N4RT http://www.hfsignals.com/index.php/ubitx-circuit-description/ Scroll to the bottom for the full schematic. Arv K7HKL _._

I got the heads up form PayPal that my uBit has shipped.? Ordered on Jan. 8,2018, almost 2 months to day.? I still have wire up the Bit40, plus other projects, I am probably the only ham that has

What's this reference? My guess is that they are telling you that in the bridge configuration of the TDA2822M where both halves are used out of phase, you must use a stereo jack to external

David, The message # for the problem with using a mono plug for the speaker is #42601 J

ST makes the 78L** parts in a SOT-89 package. Same package as U2, the 78L05 for the IRF510 gate bias. TI and Fairchild LM78L** parts only come in the SOIC-8 and TO-90 (also some dinky BGA that we

Hi David, I have the TDA2822M in mine.? I found a reference where they indicated that you must use a stereo plug for an external speaker.? I was using a Kenwood SP23 thinking quality but found it

""just a total malapropism (look that up!) WOW! How did you know i had to? It is a gift right? Is it because I'm Canadian living among the Ameriglish/Yankish? It is really no big deal. I make

How about the wiper of the volume pot? Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/ http://www.metalworkingfun.com

For my part I'd be happy with the provision of an audio take-off connector on board. That way I can run whatever drop-in module or external powered speaker I like. Paul ZS2OE

Maybe Claude is your Santa: ? ??/g/BITX20/message/43156 The uBitx needs the extra gain of a 1uF cap between pins 1 and 8 as on the Bitx40. (The 0.1uF cap of post 43189 is likely

Thanks Satish, John and Arv. I did not have the BPF connected at the time of experimenting. But it would probably lower the signal even more. So it's best to get a strong signal before I attempt

Ok my fault.? I assumed that since band select stopped at 2000 khz it didn't go lower.? Tuned in 1530 and it comes in with static but intelligible. -- Jason Schlager KM6AUS

Graham, A current limiter on the PA is not a good idea. That would be the same as overdriving the PA and causing "flat-topping". That causes all kinds of spurious responses in your transmitted

Does the 2073D work as well or better than the TDA2822? thanks, Paul K0ZYV To: [email protected] Sent: Wednesday, March 7, 2018 9:45 AM Subject: Re: [BITX20] Micro BitX No Audio TDA2822?

I like this solution. I can't quite see what is printed on your unit but it seems to be an SOT-89 type package. I can't find any 7809 units in that configuration. I can find them in the D2pak or the

There's more than one failure mode. The bad clones like the DX can't tolerate 12v. A good part might eventually go if you exceed the power dissipation rating by running it at high volume with a 12v

Well it is time to get off the Pot and ship the first of the new Ubit RaduinoUMax. Working like a beaver here since the PCBs arrived Friday! The MAX is for the 16 Added I/O pins on the end of the

Ron, The audio is available from the yellow and green ground. You could connect that to an ampli speaker and confirm. If that is working then replace the amp U1. Raj