New to the BITX community, but have had some Arduino/DDS projects in the portfolio, and while awaiting my rig have been doing dangerous and foolhardy things - reading manuals and schematics - hi Notic

A bit more digging into the datasheets for the ATMEGA328 and the Si5351a... The I2C bus SCL and SDA pins of the NANO (A5 and A4) are part of the ATMEGA's "Port C" general purpose I/O. When used as a d

Ah ha !! TWEN... that's the info I was looking for... Thanks for the heads up. Now I can sleep at night again - and put the scope probes away :^)) Jim, N5IB From the ATMEGA328datasheet: • SCL/ADC5/PCI

The principal problem is that A6 and A7 can not be used as digital pins. Now, since the level detecting keyer scheme sorta works on A6, why not use A7 to do the same sort of thing, but to implement th

For the relays, think of them as a 16 pin DIP package, but with some pins not used. The pin numbers on the uBITX schematic can be used to draw up the pinout on a 16 pin array. Pins 2,4,67 on one side,

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Here's what I get if I draw out the relay pinouts (attached) N5IB

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It may be a poor contact issue between the actual LCD panel and its driver board. I noticed it on a similar display here While the display is powered up, try squeezing the LCD portion of the display u

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Hi Gordon, No - that ExpressPCB file will not be acceptable to most manufacturer's who require gerbers. The Gerber/Excellon format is a very specific industry standard method for specifying automated

I visited the EasyEDA site this morning and noticed they have changed the portal for submitting gerbers for fabrication. It now brings you to a JLCPCB page with a gerber viewer that is different from

One other possibility to consider to protect against overcurrent situations is to use a current limiting power supply, or add a current limiter to an existing power supply or battery. The current limi

ALPS, a maker of rotary encoders, recommends 10K pullup to Vcc, then 10K in series with 0.01 uF to ground. The internal pullup in the ATMega is loosely specified - somewhere in the tens of K, max 50K

I have a never-used Raduino/NANO (optionally, with LCD display) for sale. $25 postpaid to a USA address for just the Raduino/NANO, $30 postpaid USA for the Raduino/NANO and display. Shippping to a DX

The Raduino and display are spoken for... Jim, N5IB

Here's the one on mine. 852 of batch 2 With apologies to Monty Python.. it's not dead yet And has a 10 ohm resistor... N5IB

Here's what our little Skunkworks has been up to. A wee PC board that accepts a Teensy 3.5 or 3.6 processor, then plugs into the space that would have been occupied by a NANO. Corresponding I/O lines

Forgot the photo,,,

Hi Bob, Thanks for that great work to provide a clear diagram for the uBITX connections. It highlights a point of possible confusion that will probably need to be clarified higher up the pay grades th

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Just a couple of days left in our "Name the Board" contest. About three dozen entries in hand. Entries due by 2359 UTC on May 20 2018 Only entries sent to "jrg.qrv (at) gmail (dot) com" will be consid

Check the metal spring-sockets that are inserted into the plastic housing of the wiring harness. I found on mine that the little tab that is supposed to keep the metal contact from backing out did not

It would be tough. One important factor is that in moving from HF to VHF, at least here in USA, the spectral purity requirements are ratcheted up by an order of magnitude - from 43 dB down from the fu