In today’s post is a tiny Programmable Waveform Generator module based on the Analog Devices AD9833
AD9833 Waveform Generator – [Link]
by codebender_cc @ instructables.com:
An RGB LED has 4 pins, one for each color (Red, Green, Blue) and a common cathode. It has tree different color-emitting diodes that can be combined to create all sorts of color! Any color is possible depending on how bright each diode is.
How to use an RGB LED – Arduino Tutorial – [Link]
LM5160A 65V, 1.5A synchronous buck converter with integrated high-side and low-side MOSFETs is the industry’s highest power synchronous buck regulator and supports TI’s innovative Fly-Buck™ topology to deliver isolated bias supplies up to 15W with no opto-isolator.
LM5160A offers great flexibility which enables direct point-of-load regulation from a wide input voltage range of 4.5V to 65V and also simplifies isolated DC/DC designs by enabling very good output regulation with no opto-coupler required.
LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter – [Link]
The Wino board is an Arduino-like stackable development system which is both smaller and cheaper than Arduino units and features built-in WiFi as standard.
The main Wino controller board measures 26.5 x 18.5 mm and fitted with an Atmel ATSAMD21 running at 48 MHz with 128 kB Flash storage and 16 kB RAM. The board uses the ESP8266EX WiFi module which supports all the 802.11 b/g/n standards offering P2P and soft-AP modes and TCP-IP / UDP, static IP and DHCP networking. The 27-pin stackable connections around the board periphery provide connections for 15 digital GPIO pins, 6 x 12-bit ADCs and a 1 x 10-bit DAC.
Wino… like Arduino, only smaller – [Link]
by Ron Quan:
In some JFET op amps such as the AD743, the input capacitance is in the order of 18 to 20 pF. In comparison, with an LSK489 dual FET, the input capacitance is in the order of 3 pF, which will be suitable for low noise photodiode applications. In this section we will see why it is important to have low equivalent input noise and low input capacitance in a photodiode preamp.
A Guide to using FETS for Sensor Applications – [Link]
The IEEE 1394, which is also called FireWire by Apple, is an interface standard for high-speed serial bus for connecting devices to a personal computer. Like USB, IEEE 1394 is a serial bus that uses twisted-pair wiring to move data around. However, USB is limited to 12Mbps, IEEE 1394 currently handles up to 400Mbps. The reference design illustrates single and dual port FireWire protective circuits. The single-port FireWire protective circuit is designed using the MAX5943A, while the dual-port FireWire protective circuit utilizes the MAX5944.
The circuit provides a 2.5A adjustable current limiting to the load at initial connection or during an overcurrent fault condition. It also provides 2ms adjustable current-limit timeout for excessive load current. It automatically attempts to restart after a fault shutdown condition. Some other features involve; less than 8 percent current-limited duty cycle during continuous fault condition, 6.5V undervoltage shutdown protection, low-drop O-Ring in multiple-power-source applications, and fault reporting. The FireWire port used in this design is the TE Connectivity’s 1734290-1. This connector conforms to IEEE 1394 standard with easy connections to equipment for use with plug and play devices.
This reference design is intended for circuit protection of IEEE 1394 single and dual port FireWire. It is applicable to wide ranges of PC connections, AV equipment and other related peripherals. It is also useful for automatic mounting machines with embossed tapes.
IEEE 1394 Single And Dual Port FireWire Protective Circuits – [Link]
Dilshan Jayakody writes:
UC3844 is popular current mode controller which is commonly found on DC-to-DC converter circuits and switch mode power supplies. This motor speed controller is also based on UC3844 and it is specifically design to drive 20V – 24V DC motors.
In this given configuration UC3844 produces (approx.) 50kHz to 240kHz PWM output and this range can be adjust by changing the value of C2 timing capacitor. As per the datasheet UC3844 is capable to produce PWM output frequency up to 1MHz.
UC3844 base motor speed controller – [Link]
Pitt Meadows build a weather station based on ATMEL ATMega168 microcontroller. He writes:
The Small Weather Station is a battery-operated, wireless, weather station. I have been working on the project for almost a year now, and now I have an unshielded prototype that is partially functional. I say partially functional, because it does not have any wind/rain sensors installed, only the connections for them. So far it can log several things: temperature, humidity, atmospheric pressure, and battery voltage. However, the connectors for the rest of the sensors are functional; the only thing they require are several magnetic reed switches.
ATMEGA168 Weather Station – [Link]
A possibility to read an RFID card even on a longer distance is usually highly appreciated at its everyday usage.
As we know, RFID module range is expressively depending on a size and shape of the RFID antenna (coil). That´s why the module with a big antenna has a potentially bigger chance to reach a long range. This is exactly a case of the ID3LA module – working in a wider operating voltages range (2,8-5V) than its predecessor – the ID2 module. This enables its usage even with a 3.3V logic and also for example in battery-operated devices (3-4x NiMH, or 1x Lithium cell, …) not requiring DC converters or a precise voltage regulation.
ID3LA belongs to the „ID3/ID12/ID20“ family with very similar electrical parameters and a way of usage. All modules of this family function as readers sending data – a unique ID of a given RFID tag. The most favourite type – ID12(LA) has a very decent range (approx.. 12cm) sufficient for majority of applications. However, if the space in your application allows you to use ID3LA, you´ll reach a significantly longer range. ID3LA requires an external antenna – included in the package, as illustrated on the attached pictures.
Detailed information will provide you the ID3LA datasheet.
With the ID3LA RFID module it´s possible to read a tag up to 30cm – [Link]
Housed in a low-profile 24-pin QFN package, the LTC4040 from Linear Technology is a 2.5-A lithium-battery–backup power-management system for 3.5-V to 5-V supply rails that must be kept active during a main power failure. The device uses an on-chip bidirectional synchronous converter to provide high-efficiency battery charging, as well as high-current, high-efficiency backup power.
When external power is available, the LTC4040 operates as a step-down battery charger for single-cell lithium ion or lithium iron phosphate batteries, while giving preference to the system load. When the input supply drops below the adjustable power-fail-input threshold, the LTC4040 operates as a step-up regulator capable of delivering up to 2.5 A to the system output from the backup battery. In the event of a power failure, the part provides reverse blocking and a seamless switchover between input power and backup power.
IC manages battery-backup systems – [Link]