20 W direct AC LED driver analog and phase-cut dimming

Broadcom Switch/PHY Timing Solutions from Silicon Labs

Schematic PCB

Simple wireless temperature monitor also has data logging capabilities

This design idea shows how you can design a simple wireless temperature-monitoring system with data-logging capabilities by using a local temperature sensor and an ASK transmitter and receiver pair.

LPC845-BRK: LPC845 breakout board for LPC84x series MCUs

The LPCXpresso845 breakout board is an ultra-low-cost development board for evaluation and prototyping using the LPC84x series MCUs.

Schematic PCB

RHYTHM SB3231 Behind the Ear Hearing Aid Reference Design 1.0

555 timer: 4MHz (80 meter band) CW transmitter

Might not be an actual working transmitter, but it does produce a few mW of RF power at 4 MHz using only two LMC555s.
Principle of Operation (see attached simplified schematic):
At lower operating voltages, the flip-flop (TR) input of the LMC555 can be used as an inverting comparator input to control the output of the device. This requires the Threshold (TH) input to be active (high). This circuit applies a DC bias at the switching threshold of TR and superimposes a small AC feedback signal to create an oscillator. An inverted version of the same signal is applied to the second LMC555 to produce two complementary open collector outputs (the device's discharge output). The output is then connected as a standard push-pull RF amplifier. The TH input is used as the enable input to key the transmitter.

Schematic PCB

Huawei RF Basic Knowledge Training

Schematic PCB

B4860QDS: QorIQ ^® Qonverge Development System

B4860QDS is a development system that supports NXPThe B4860 baseband system-on-chip (SoC) device provides a complete application development environment.

SPIRIT1 - Low Data Rate Transceiver - 169 MHz - Full Kit

SPIRIT1 - Low Data Rate Transceiver - 169 MHz - Complete Kit

Schematic PCB

EPR-68 - 6.6W DC-DC Flyback Converter

Schematic PCB

SPIRIT1-Low Data Rate Transceiver-915 MHz-USB dongle

SPIRIT1 - Low Data Rate Transceiver - 915 MHz - USB dongle

Schematic PCB

CN0145

Build a 4 mA to 20 mA loop-powered temperature monitor using the ADuC7060/ADuC7061 precision analog microcontrollers

Schematic PCB

Intel FPGA Timing Solutions from Silicon Labs

Schematic PCB

Calibration system for pressure transmitter based on AD855X programmable gain amplifier

This reference design addresses this need for pre-factory calibration and provides a complete multi-channel fully automatic calibration system for pressure transmitter calibration before leaving the factory.

Schematic PCB

Mixed Signal Digital Predistortion (MSDPD) Platform

Digital predistortion technology has become a mainstream technology to improve the efficiency of power amplifiers and is widely used in mobile communication systems. The efficiency of the traditional 3G air interface LDMOS power amplifier is only about 15%. Using digital predistortion technology can increase the efficiency to about 45%, which can save considerable costs for a huge base station network. The high-performance digital predistortion platform provided by ADI includes a transmit link and a predistortion receive link.

Schematic PCB

Sub-1 GHz 868 MHz RF expansion board based on S2-LP radio for STM32 Nucleo

Sub-1 GHz 868 MHz RF expansion board based on S2-LP wireless transceiver for STM32 Nucleo

Schematic PCB

GPS USB Reference Design Using the MAX2769

The MAX2769 is a low-cost, single-conversion, low-IF frequency GPS receiver that provides 115dB cascaded gain and a 1.4dB cascaded NF. The MAX2769 GPS USB reference design, working together with the GeotateSM GPS software installed in a PC or laptop, forms a complete low-cost high-sensitivity GPS solution. The reference design provides high-precision position information with quick acquisition times. It demonstrates the excellent capabilities of the MAX2769 in a full GPS receiver design.

Offline High Power Factor Triac Dimmable LED Driver GreenPoint® Reference Design

10.5GHz (X-band) patch antenna

4 Layers PCB 60 x 171 mm FR-4, 1.6 mm, 1, HASL lead free, Green Solder Mask, White silkscreen;10.5GHz, 8 element, patch antenna. Make your own phased array for communications or radar. Full instructions at github .com/jonkraft

Schematic PCB

MAX2830 WLAN Reference Design

This reference design is a complete RF front-end solution designed to meet the WLAN IEEE® 802.11b/g standard. Using the MAX2830 RF transceiver, the design is capable of accommodating full range of 802.11g OFDM data rates (6, 9, 12, 18, 24, 36, 48, and 54Mbps) and 802.11b QPSK data rates (1, 2, 5.5, and 11Mbps). This solution offers high performance, small size, and low BOM cost.