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It looks like you had a short between +12 and GND. A fuse will help with fire, but it will not protect the electronics. If you have a stable 5V at the output and can adjust the frequency you have a

Talk about the boosted voltage for higher output included a mention of turning down the output by reducing voltage to PA. Anyone have a figure on how low the voltage can be? And does the

Is information available on the changes needed to put the BITX40 on 80 Meters? Thanks - Dave, N4ELM

I think there may have been a short inside the circuit board or something, i moved the chip to the backside and glued it on, then ran wires to different points on the board and it seems to work

Can you post a picture indicating where the smoke comes out and which trace has been blown? That part is a voltage regulator that includes current limitation, so I do not think you have a short on

Volume Pot, no switch ( http://www.ebay.ca/itm/10K-OHM-Logarithmic-Taper-Potentiometer-Pot-A10K-/250840408606?hash=item3a6740e21e:g:ec8AAOxyhtpR58Jx ) Tuning Pot (

My mic also uses a common ground. I checked the grounds from mic, ptt and speaker on the bitx, they all seem to be the same at least at dc. Schematic seems to show the same. I connected the ground

Great idea makes everything automatic, just supply the voltage you want for the final. Also if you use the step up/down modules seems like you could lower the voltage to get low power out for

Yes I added USB and a digital interface to the rig. I used an easy digi?http://www.ebay.com/itm/EASY-DIGI-Digital-Sound-Card-Interface-PSK-RTTY-SSTV-NBEMS-JT-65-HF-VHF-UH5-/220896968460 (

The mcHF SDR kits sold by Chris in the UK (M0NKA) use the STM32, and are CAT enabled using the same command set as the Yaesu FT-817. RichKC8MWG

Lacking a Radio Shack style of store makes the "see, touch and feel" part of your purchase difficult, unless you have one that is still open near you. We have a nice electronics place here in MA. If

Might I suggest that you series the batteries and then use a buck module to create the 12 volts. The last ones I bought I got 5 for $6 on ebay from a US supplier. They are good for 3 amps.

Great Job Bruce !

Anyone tried WSPR Tx/Rx from BITX40?

You can do a better job. Just use 24V, then use 3 regulators in series. The 24V feed the PA directly. It also goes to a 7820 regulator, which then goes to a 7815 regulator which then goes to a 7812

I was also thinking about STM32 cheap modules, but the code certainly will require porting of some of the libraries. Dimiter, LZ1NEF

Instead of Teensy, how about an STM32 "blue pill", very cheap? John VK5COR

Because I'm not doing it, I don't have an answer, but what is the current drain of the final while in transmit when connected at 24V.. Is the IRF150 totally turned off? without excitation in

Have you gotten this to work?? I am curious to how it was wired up to the board.? I wasn't able to get my similar speaker mic to work due to a common ground.

how about 6 volt and 12 volt. or stack 1.2 volt rechargables in half inch plastic pipe to safe voltage supply.