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I just ?wired up and tried a $5 audio amp from ebay ,works a dream. Cheers Ross

Gordon, I’ve been using the easydigi’s, is that the purpose of cap in between both mic and audio connections to radio? Joe

Agreed that the supplied voltage on the mic capsule will give you hassels. With a 600:600 transformer things will be worse. The supplied voltage will now go through the transfomer winding to ground.

Since someone asked about an RC filter ...Logical place would be on Clk02 (45-75 Mhz)? ...as an example random/scraped from google Double the l's and spice it ...Not simple ..There is a reason RF

...more on this here: /g/BITX20/message/65994

There is a voltage on the MIC circuit, you NEED a 1:1 transformer and/or a blocking cap, or your laptop/tablet/soundcard will freak out at the least, or get damaged at the worst. The MIC in on my V4

Any 600ohm 1:1 audio transformer is a very good idea. 600ohms is a typical impedance presented by headphones these days, so it's a good value to shoot for. There is a voltage present on the MIC in of

Transformer Makes it worse. Do not short the dc bias voltage—likely it will take input transistor or op amp to un-usable bias

could something like a 600:600 transformer solve that issue too? I’ve been putting them between all my audio and mic I/O’s when connecting to pc/soundcard Joe kd2nfc

Hey Allison, since all we need are a few DB less harmonics, would a modest number of limited stages diode switched accomplish a useable goal? Maybe 10-12 dB improvement on a daughterboard?? You

We made the mistake of not dc blocking mic inputs of some commercial vhf rigs —-bad distortion in input stage

Is there RC that can do it? Best answer for that is SERIOUSLY?? ;) The frequency range is more than 10:1 from about 1.8mhz to 29.9999 pick an rc value that rounds the edges at say 3mhz that doesn't

Is dc blocking capacitor necessary between sound card audio output and mic input of ubitx during digital modes?. I made a direct connection between above without DC blocking cap. Though? my ubitx

It is Nice , but take precaution to power TDA2822 only with 6V dc by using 7806 only for powering TDA2822. Secondly, never use mono 3.5mm plug in the stereo 3.5mm socket provided for speaker. The

Got my TDA2822 in the post, and installed it. I put it on the rear of my case, and fed it with the speaker leads from the audio board that comes with Sunil's case, then i have the output switchable

Hello All I have one (5 volt) of these but I don't know how to wire it on my uBitx v5 please help ! Many thanks. 73' Olivier

I mean, sure, but you could also put some filtering on a couple of si5351 outputs to get them to be sine waves, then mix them to get higher frequencies with the kind of control (and yeah, a bandpass

Thanks, Josh. Took me a fair bit of thought to wrap my head around your explanation, but yes: got it. Looks like GHz DSP and 16-bit or better to do it that way: abort! :) 73 Dex

If you were to produce the correct sine values for each point, you are describing a DDS. If your samples are fast enough, this might push harmonics out - but in the case of a 30MHz carrier (call this

Ain't that essentially what we're already doing on the output? OK, so we do that on the input too: cleaner CW. Is there RC that can do it? 73 Dex