Hotplate Soldering Iron: Repurpose an old electric iron into a heated soldering station

The basic concept of this work is slightly different from standard tools such as a reflow oven or soldering iron. Heat is provided from the bottom of the PCB.

Schematic PCB

Smarthome-dashbutton: smart home control button

This is what smart home enthusiasts want to control their entire lights, thermostat, or any other smart device from their couch without having to activate a wall switch.

Schematic PCB

Picoclick: Small and simple IoT button

Picoclick is a simple IoT button in a very small package. The size of the PCB is only 18x20mm, and the height with the 300909 battery is only about 10mm. It's able to connect to your local WiFi at an impressive speed of about 1.5 seconds on average. Yes, since it calls IOT-Button, it uses WiFi of course! This opens up countless possibilities for that little device.

Schematic PCB

Picoclick-C3: Small WiFi and BLE IoT button for multiple applications

Picoclick-C3 The name relates to its new processor, the ESP32-C3, a single-core RISC-V 160MHz CPU. Picoclick C3T is a small WiFi and BLE IoT button suitable for a variety of applications. Originally designed for smart homes, Picoclick can also be used as an actuator for IFTTT automation or as an MQTT device. It is based on the single-core ESP32-C3 RISC-V processor, so it has a lot of useful features. The C3T measures just 10.5mm x 18mm.

Schematic PCB

ESP32Picoremote: ESP32 WiFi remote control with TFT display, mini TV, capable of playing GIFs

The WiFi remote control is based on ESP32 Pico D4 MCU and 160x80 pixel mini TFT display. Additionally, there are onboard I2C temperature and humidity sensors and an accelerometer.

Schematic PCB

Fully open source reflow soldering Reflow-Controller: based on ESP32-S2, magic oven modification

Reflow-Controller is designed to control different types of reflow ovens, hot plates, etc. It's based on the ESP32-S2, so it can be programmed to work with WiFi applications, but it also has an onboard OLED display and three buttons for use as a standalone solution.

Schematic PCB

100W LED driver evaluation board using high-frequency LCC transformer to achieve low-cost and miniaturized design

This 100 W reference design highlights the excellent power quality and high frequency performance of the half-bridge (HB) driver using the ICL5102 with the economical CoolMOS™ P7 series. The design takes full advantage of the applicable frequency range of the HB driver to create Highly compact LCC transformer. This transformer integrates the series inductance of the LCC resonant tank. Relying on this high power density transformer design, the high frequency operation capability can drive system cost and size reduction.

CoolMOS™ CE 16W single-ended cap T8 lighting demonstration board in SOT-223 package

A SOT-223 packaged CoolMOS™ CE superjunction MOSFET (IPN60R3K4CE) (600V, 3.4Ω) is used as the main switch for this single-ended cap T8 LED lamp driver board with high line output and 16W/66V output converter. The converter uses ICL8201 (SOT23-6-1) to achieve average current controlled non-isolated single-stage buck topology in a cascade structure LED driver. Unique features of this reference design include single-stage design for high efficiency and power factor, single choke (no auxiliary winding) critical conduction operation, true regulated output current over a wide output voltage range, and excellent EMI performance and various protection modes for high reliability and small size that easily fits into a standard T8 LED lamp single-ended cap.

XDPL8105 40W Reference Design

The XDPL8105 40W reference design is a digital ground configured LED driver with a universal input of 90-305 V AC, a wide output load range of 16-45VDC and isolated 0-10V dimming based on a CDM10V dimming IC. The power stage uses IPD80R1K4CE, a 900mOhm CoolMOS™ CE power MOSFET. 

42 W high power factor constant voltage output flyback converter based on ICL8810

REF_ICL8810_LED_42W_PSR This 42 W reference design uses Infineon's high power factor flyback controller ICL8810. The evaluation board is a constant voltage (CV) secondary side regulation (SSR) system designed for use with a constant current (CC) converter for LED lighting applications.

43 W high power factor constant voltage output flyback converter based on ICL8820

REF_ICL8820_LED_43W_JT This 43 W reference design uses Infineon's high power factor flyback controller ICL8820. The evaluation board is a constant voltage (CV) secondary side regulation (SSR) system designed for use with a constant current (CC) converter for LED lighting applications.

15W 5 V USB Adapter Reference Design Board Using Quasi-Resonant PWM IC ICE2QS03G and CoolMOS IPS65R 1 K5CE

This is a 15W 5V USB adapter reference design board using quasi-resonant PWM IC ICE2QS03G (DSO-8) with CoolMOS™ IPS65R1K5CE (IPAK SL) and secondary side synchronous rectification with OptiMOS™ BSZ100N06LS3G (S3O8, 3x3 mm style SuperSO8) IR1161 (5-pin SOT-23). Designed for high-reliability systems, this reference USB adapter board features a compact form factor, high efficiency, low standby power, various protection methods, and passes conductive electromagnetic interference, ESD, and lightning shock wave testing. Customers only need to make slight changes to this board, and it can be used for production after final confirmation.

43 W high power factor constant voltage output flyback converter based on ICL8810

REF_ICL8810_LED_43W_BM This 43 W reference design uses Infineon's high power factor flyback controller ICL8810. The evaluation board is a constant voltage (CV) secondary side regulation (SSR) system designed for use with a constant current (CC) converter for LED lighting applications. Two-stage topologies are becoming increasingly popular due to the easy scalability of primary-side power and secondary-side characteristics. The REF_ICL8810_LED_43W_BM solution features a plug-and-play design and can be used with the secondary-side DC/DC evaluation board. As a default, the reference design board is equipped with a depletion mode MOSFET BSS126I based startup circuit on a small adapter board. This setup will significantly reduce standby losses. If low standby power consumption is not required, the startup circuit can be changed to a resistive startup design. This reference design comes with two conditioning circuits. Both are plug-and-play solutions, but at least one circuit must be connected to the motherboard. There is a cost trade-off between the two evaluation boards; the TL431 evaluation board is lower cost and has good standby performance, while the op amp board exhibits excellent overall performance at the 30 mW power level. With its benchmark power factor correction and total harmonic distortion performance at full and light load conditions, the ICL8800 supports window driver and platform designs. In addition, the IC combines excellent efficiency with low EMI characteristics without compromising light quality.

43 W high power factor constant voltage output flyback converter based on ICL8800

REF_ICL8800_LED_43W This 43 W reference design uses Infineon's high power factor flyback controller ICL8800. The evaluation board is a constant voltage (CV) secondary side regulation (SSR) system designed for use with a constant current (CC) converter for LED lighting applications. Two-stage topologies are becoming increasingly popular due to the easy scalability of primary-side power and secondary-side characteristics. The REF_ICL8800_LED_43W solution features a plug-and-play design and can be used with the secondary-side DC/DC evaluation board. As a default, the reference design board is equipped with a depletion mode MOSFET BSS126I based startup circuit on a small adapter board. This setup will significantly reduce standby losses. If low standby power consumption is not required, the startup circuit can be changed to a resistive startup design. This reference design comes with two conditioning circuits. Both are plug-and-play solutions, but at least one circuit must be connected to the motherboard. There is a cost trade-off between the two evaluation boards; the TL431 evaluation board is lower cost and has good standby performance, while the op amp board exhibits excellent overall performance at the 30 mW power level.

8W 12V reference design using ICE5AR4770BZS

This 8W auxiliary SMPS reference design operates over a wide input range and is considered for indoor residential air conditioning applications. It uses the new ICE5AR4770BZSPWM fixed frequency CoolSET™ with a 700V integrated MOSFET in a DIP-7 package.

Schematic PCB

OpenHeat: open source intelligent heating platform

A practical heating table for PCB reflow soldering. It is quite cool. It may be the most beautiful and functional heating table on the market. Parameters: The hardware is based on the ESP32PICO-D4 chip, the input power is 24V/10A, the maximum power is 200W, and the heating temperature is up to 300°C. It has Bluetooth function. If I have time later, I will develop a mobile APP to set the temperature rise curve.

Schematic PCB

DIY Tactile Input Knob: BLDC Motor + Round LCD

SmartKnob is an open source input device with software-configurable stops and virtual locators. The brushless gimbal motor is paired with a magnetic encoder to provide closed-loop torque feedback control, allowing the feel of the detent and stop to be dynamically created and adjusted.

Schematic PCB

Super mini & low-cost Linux development board based on Allwinner F1C200s (produced by Zhihuijun)

The cost of the board should be less than 50RMB, and it provides a lot of information, which is very suitable for novices to use as a development board to learn Linux.

Schematic PCB

Universal gear indicator for motorcycles

This is a new design for a universal gear indicator that can be installed on any motorcycle as an aftermarket accessory. Its main advantage is that its operation depends entirely on the movement of the gear lever, rather than being connected to speedometer and tachometer sensors (found in expensive commercial equipment), which are rarely found in older motorcycles. It consists of a main circuit including a 7-segment LED indicator, two Hall sensors attached to the motorcycle frame, and a small magnet placed on the gear lever.

Schematic PCB

Small security key product designed based on STM32L432

Somu is a small FIDO2 security key that you can use with your Google, Twitter, and GitHub accounts for two-factor authentication, or with your Microsoft account for passwordless login.

Schematic PCB