Potentiometer Input Impedance For AtoD Inputs This is based on the discussion found here. AtoD inputs will be specified with a maximum source resistance for them to function correctly to all of their specifications. The source resistance of a pot is highest at its midpoint setting, but even at that position it is only 1/4 of […]
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Relay Contact Materials
Hard Silver Ag[97-98%], Cu+Ni General application relays. The copper and nickel contents give hardness. Long contact life, but tends to oxidise at higher temperatures. Silver Nickel AgNi A good standard contact material. More resistant to welding at high loads than hard silver. High burnout resistance. Silver Cadmium Oxide AgCdO More resistant to welding at […]
Thermocouples
Good resources http://circuitcellar.com/editorsblog/the-basics-of-thermocouples/
UNI/O General
The UNI/O protocol was created by microchip and is a 1 wire bus. Docs UNI/O Bus Specification Recommended Usage of Microchip UNI/O™ Bus-Compatible Serial EEPROMs Voltage Range Not specified by the protocol so dependent on the devices being used. Circuit A pull up resistor is not required but advisable so the bus is idle if the master […]
SMBus General
Referred to as: System Management BusSMBusSMB Commonly found on computer motherboards for communication with the power source, battery charging, etc. Based on I2C bus: Clock frequency range 10kHz to 100kHz (a minimum is specified as SMBus has a timeout feature). Voltage levels and timings are more strictly defined than for I2C, but devices using the two […]
Modbus General
Good Resources https://www.rtautomation.com/technologies/modbus-rtu/ https://www.rtautomation.com/technologies/modbus-tcpip/ Serial Modbus Serial MODBUS connections can be ASCII and RTU (binary coded). Modbus RTU: Messages are a smaller size and therefore faster, Uses timing of bus silence Modbus ASCII messages are easily human readable. All nodes within one MODBUS network must use the same transmission mode. UART Setup No specific baud […]
.Power Supply Suppliers
UK ecopacpower.co.uk meanwell.co.uk powerboxcraftec.com powersolve.co.uk (now part of XP) xppower.com
USB Cables
USB To Mini Round DC Power Cables http://www.lindy.co.uk/cables-adapters-c1/usb-c449/usb-power-c1518/1-5m-usb-to-2-5mm-inner-5-5mm-outer-dc-adapter-cable-p7253 http://www.lindy.co.uk/cables-adapters-c1/usb-c449/usb-power-c1518/1-5m-usb-to-1-35mm-inner-3-5mm-outer-dc-cable-p7252 http://www.lindy.co.uk/cables-adapters-c1/usb-c449/usb-power-c1518/1-5m-usb-to-0-7mm-inner-2-3mm-outer-dc-cable-p7251
Battery Transit
Example of a lithium battery warning label used by Amazon in the UK late 2013
Thermify
Thermify uses the by-product of computer processing for heating. Our head designer founded Thermify – see our data furnace page here.