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OK, I think we need to know a little more about the connections from the analogue connector.Firstly are you using a direct connection between this analogue connector and the sockets(earphone etc) or

Is this a stock display?? Any other mods? Easiest might be to just add a heatsink if one is not already installed. This would be the first time that I have read about a stock system having 7805

Ubitx ver 4.3 Was working now frequency stuck at 7.149.950. LM7805CT very hot power supply 12.5 v

Some day I'll tell the follow-up to the story where I ran into that high school counselor 10 years later... Jack, W8TEE

My daughter is a PhD economist like you and she took all the math I did as an EE plus some! Maybe you should have stuck it out. Couldn't talk her into IE either... James

Really neat stuff!! I loved electronics as far back as I can remember. I got my Novice license when I was 11 (1954), General a year later, and have been licensed ever since. I wanted to be an EE.

@Raj vu2zap The problem is at any volume

@Ian Reeve the problem remains.

Has anyone set up WSPR for position report and message ( http://aprs.org/aprs-wspr.html ) use?? I find Bob Bruninga's web pages read more like hypothetical possibilities than actual application but

Are there any controls or jacks that I should isolate from my metal chassis?? Specifically, I'm thinking of the PTT and C/W key inputs, since those are wired to the Raduino.? Since they are part of

If the problem is at low volume level then add any resistor value between 1-10K in series with center volume control wire and see if that helps. Raj, vu2zap

OK short the lead that went to the centre contact to the case and advise if the noise stops. Get Outlook for Android<https://aka.ms/ghei36> ________________________________ Sent: Wednesday, August 21,

I tried unplugging the volume control completely, the problem persists

I don't recall the colors of the wires that go to the volume control but what I would do is unsolder the lead to the centre connection(audio to amplifier) If the noise continues it signifies a problem

Please help

I think you meant Mistakes are made by those *who do things* ,?but then even those who never do anything make a mistake by not doing anything. and it is so true. . _._,_

HI Mistakes are made by those who never do anything, but then even those who never do anything make a mistake by not doing anything. Enjoy.

HI, This interesting article shows prototypes like I see in projects in this group, are like the test and development prototypes for many analog ICs. A look into the days before SPICE simulations

Well that makes more sense.? How do you make a 25 kHz wide LC filter at VHF? You don't.? I optimistically misread. Thanks Lawrence. As Roseanne Rosannadanna used to say..."nevermind."

I'm looking to potentially add an audio DSP filter to my uBITX... I've got a Teensy 3.2 lying around that hasn't been used for anything, and I figured that 'd be the perfect toy to try out for this