Eric Brombaugh designed this ADC board for RF signals:
This is an ADC designed for use in digitizing RF signals with up to 40MHz bandwidth and 80dB SNR. The form-factor is compatible with a dual-connector Digilent Pmod so that it can be used with commonly available FPGA development boards to build a variety Software-Defined radio functions.
- ADC14C105 14-bit 105MSPS RXADC.
- Onboard 3.3V Regulator (5V input)
- Filtered Analog 3.3V Supply
- Onboard 80MHz clock oscillator
- Digilent-compatible 2-connector Pmod interface
- 50-ohm SMA input – 2.5Vpp ~= 0dBfs
emeb has shared the board on OSH Park:
Brian Benchoff of Hackaday writes about a surprise PCB he received at the Hackady Unconference in Chicago last weekend:
For the last few years, Hackaday has really been stepping up our game with marketing materials. Our t-shirts and swag are second to none, and last year we introduced the ‘Benchoff Buck’ [..]
Andrew Sowa created the Benchoff Nickel. It’s a visage of yours truly emblazoned on a PCB, rendered in FR4, silkscreen, gold, and OSHPark’s royal purple.
The Benchoff Nickel was created in KiCad using the Bitmap2Component functionality. Planning this required a little bit of work; there are only five colors you can get on an OSH Park PCB, from white to gold to beige to purple (soldermask on top of copper) to black (soldermask with no copper). Luckily, the best picture we have of me renders very well in five colors.
We are excited for the 2017 Open Hardware Summit this Fall in Denver, and we’re pleased to see the Ada Lovelace Fellowship is now open for applications:
The Ada Lovelace Fellowship encourages women, LGBTA+, and/or other minorities in the open technology movement to both participate and nurture an incredible, diverse community within open source.
For the fifth year running, we are ecstatic to offer TEN (10) Open Hardware Fellowships to members of the community. This includes travel assistance and entrance to the 2017 open Hardware Summit!
We are at an exciting point in time for open source and hope to encourage everyone, no matter their walk in life, to embrace and participate in this incredible movement!
Today the 2017 Hackaday Prize begins! This is Hackaday’s global engineering initiative that encourages people to direct their skill and energy to make the world a better place. We call it the Hackaday Prize, but it’s far more than that. Join a community of talented people who enrich their own lives by seeking out new challenges and new…
via 2017 Hackaday Prize Begins Right Now — Hackaday
Surface mount PCBs (Part 1) If you look at a circuit board today, you’ll see a beautiful array of surface mount chips and components, including very fine 0.5mm or even 0.4mm leaded devices and BGAs. Some of these ‘exotic’ devices can contain really advanced technology such as high speed ARM microprocessors, flash and high capacity […]
via Working with Surface Mount Components and BGAs — Intelligent Toasters
Piotr Zapart designed this board to overcome range issues when using traditional 300 degree potentiometers or Hall sensors as rotational angle to voltage converters:
The idea was to create a device that will perform an axis calibration, usually done in digital domain, but before sampling the signal in the ADC, still in analog domain, using it’s advantageous infinite resolution
the main function of this device is to:
- Buffer the analog output signal coming from a potentiometer or another rotary angle to voltage converter like ie. Hall sensors.
- Filter out the high band noise and limit the bandwidth to an usable range only, protect the input against voltage spikes.
- Match the output voltage range of the source (pot/hall sensor) with the input range of the ADC, thus making the most of the available ADC resolution.
- Linearize the hall sensor output signal response by amplyfing it’s most linear region to the full scale ADC input range.
The board is shared on OSH Park:
Teensy creator Paul Stoffregen designed this board to momentarily disconnect a USB device:
This simple board plugs inline with a USB cable. It always passes the 5V power and normally passes the USB data signals. But when you press the button, the USB data signals are momentarily disconnected.
For the last few months I’ve been developing a USB Host Library
for powerful but complex EHCI USB port in Teensy 3.6 [..]
Reaching over to physically unplug the USB cable gets old quickly! Really, really old, both hands off my keyboard… right when trying to focus [..]
I made this handy little board with a proper USB 2.0 high speed mux chip. The control signal is just 3.3V logic, so I might even wire it up to something to automate the process.