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Ok it's clear now. Thanks for the help I have a lot to learn. When I get a chance I will change that diode and try again.

Thank you for the advice. I already have a bunch of low pass filter boards from kitsandparts a few years back, so just need the bandpass units. I was looking at the qrp labs board, so that may be the

Hi, Over the months I have published a number of minimal hardware mods that are required for certain added functionalities in the Raduino software. I noticed it is sometimes confusing and hard to

Looks like D7 is a snubber diode for the relay K1. There's also a snubber diode D8 on relay K2 (near the blue trimmer RV1).

The Raduino has a 5V regulator to drop the voltage for the Nano soldered in. Raduino takes the same 12V that the BITX40 takes but brings it down to 5V. By mistake if you connect or a oops moment put

Thats confusing unless I'm missing something. The wiring diagram shows +12v to orange wire on raduino and black to ground

OK, folks - Tuning clicks conquered! Reading back on earlier messages here, it seems the regulator 7805 deserved some attention. I had fed this via 51E to drop a few volts and 'take some heat', and

Hi Brent,? ? ? ? ? ? ? ?There are one or two boards already out there that used fixed inductors and are set up for Multiband use. WB6DHW BPF Board springs to mind as it is one I tried. It was

Dex, Put a 1K to 10K in the brown lead going to the volume control. That should get rid of the hum. It results from LM386 getting unstable. Raj

"Standard" inductors have a verly low quality factor, so they are not usable for bpf?s having a narrow bandwidth. In contrast, the Coils Farhan uses carbonbyl cores, for his Coils giving an unloaded

Bill N2CQR wrote... https://www.youtube.com/watch?v=7z9NUV_YrOo So, if half of the BITX40 is made of Bosons, does it mean the other half is made of Fermions? It's all over my head. I just turn it on

It's a SMT 1N4148. It can take about 1.5A forward current before overheating and giving up the ghost. It is a cheap and common diode if you have to replace it. If the reversal was short enough, most

Nothing special, just a 4148 I believe.

Wow I actually did have the voltage backwards. I was trying out this down converter with 4 18650 batteries and they have the negative out labeled as positive. Does anyone know the specs on that diode?

D7 is in the VCC line right next to the relay K1. Check your wiring. It seems likely that you applied 12v to the Nano (or reversed the polarity), which probably fried it. If K1 coil is open, then the

Bottom left corner of schematic. Are you sure you don't have the power hooked up backwards?

I forgot to ground the black wire on the arduino. When I plugged in the power D7 started smoking. I pulled the power grounded the black wire (one next to the brown) then tried again and it started

Greetings, all ... I have replaced my banjaxed raduino. It ran on the original firmware, and I'd applied several fixes to the Bitx40: ?- better biasing for Q16 ?- N2CQR's active filter replacing

I still have lots of Raduino X bare PCBs and completed boards. In case you blew up stock Raduino or want to make alternate projects. I have sold about 30, but ordered 50 PCBs. For those wanting a

I bought a BitX40 a while back with no intention of using the Raduino. It's still in the bubble wrap. $30 shipped prio conus. Email me direct if you're interested. vev at michvhf dot com Vince. --