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Dumb question; have you verified 12 volts to the final. I'll be testing while hooked via USB to my computer and forget to turn on the power supply. A mind is a terrible thing to lose but I'm becoming

I'm off looking at a very inexpensive standalone LED bargraph mWattmeter with a 25W to 25mW (30dB) range using the cheap AD8307s, but there are apparently MANY MANY different implementations and

Thank you

Thank you

Decided to expand the title a little since I'm sure there will be more questions for Don, ND6T, on his designs. Uploaded some pictures to the "Photos" section showing one alternative for AGC board

Here's a good thread about what all is going in inside the LM386. ? ?/g/BITX20/message/30876

Mic is wired correctly and can hear audio in a second rig. Audio sounds good.? Thanks

CW Keydown I hear side tone no RF

Allison, Here's my summary of issues around that 45mhz IF, correct me where I am wrong. Swapping out Q20,21,22 to BFR106's helps fix gain variations with supply? voltage, and also reduces unwanted

Looking at the internal networks of several popular audio IC devices can reveal a number of techniques to make stacked output devices more linear. The datasheet for an LM368 is a good

Also, Arv: This will work but only if a small 'trickle' of + at input base produces a transition towards - at the output emitters. 73 de ZL2DEX

Oh how little Audio experience here! Any real Hi-fi amps using comp-sym pair will have a low resistance (1 down to even below 0.1 ohms) in each emitter, and a bit of extra resistance between bases

Good Morning, I am too novice - thus afraid to try and load a different firmware - but I read the code of the Ver. 4 Firmware and it?is different, the V3 program seems much easier to work with -

Thanks for the reply's guys. That is what I was afraid of. Personally, I had no problems with the FCI TDA2282M chip that was on my board, it worked flawlessly and didn't heat up excessively even at

I didn't address anything but the audio as I don't use the original Raduinos on any of my uBITX builds but I believe Farhan said it would work. The V4 board has the Raduino built with the NANO on the

Simple solution was to use a mic that has enough contacts on PTT to allow interrupting the? mic audio on receive.?? The pop and click mods usually help with audio on the speaker during

I know Farhan said it had enough audio to drive a small speaker, but I have not found this to be the case. Mine will drive the pants off of a pair of 32 ohm headphones (only set I have with a 1/8"

First are you testing in SSB or CW? IF CW you should see power with keydown. IF SSB you will see nearly nothing (microwatts) without audio input.? Are you putting audio in? First places to look,

Could be RF getting into it. Does it happen on a dummy load? The others are ground loop, poor grounding and cross talk between the leads. Allison

very bad sound. distortion when the volume is reduced.