Sqkybeaver writes, “who’s been working on projects this holiday? I just hit a relatively high point in one of my projects. just barely up to spec for 2M transmitter.” Via the project log forum.
Wvdv2002 shared his digitally controlled power supply with us in the forums. It’s capable of driving 0-18V while having a current controlled output of 0-3A. The brains of the design is the PIC18f46j50 which controls a switch mode regulator’s voltage and current output through the MCP4822 two channel I2C DAC. Via the forum.
Need to test your power supply with a 20A capable electronic load? Gelbanana is designing just such a device. It’s an electronic load designed to spread the heat dissipation through 4 transistors each taking 5 Amps. So far he is testing the cooling system which consists of two massive aluminum heat sinks. Via the forum.
A booster board for the MSP430 LaunchPad controls brushless DC motors with or without sensors. A bunch of double NPN transistor MBT2222AD ICs drive the motors: I thought that I would share my project on the forum. I call it BLDC Booster. It is a booster pack for the MSP430 LaunchPad that allows for sensored […]
Matseng is currently developing a power line frequency, and voltage monitor. The design is meant to monitor the quality of the line power and log to an SD card for later computer analysis. He is sharing his development through GitHub and discussing it in the forum. I’m thinking of doing this project on two separate […]
Bearmos designed a 3-axies CNC stepper motor controller. It has a ATX connector, allowing it to be powered from a computer power supply. The motors are driven via onboad driver chips, while commands are received from the computer Via the parallel port. This board is mainly designed to be inexpensive, have lots of indicators for […]
Got burned by the errata? Yup, we have a bunch of times. This also happened to Matseng on his 6502 Single Board Computer Emulator. The datasheet (Atmel XMEGA D4) plainly said that the Port E can be used as a secondary I2C port, so with that assumption in mind he connected an I2C EEPROM to […]
Matseng was bored over the weekend and decided to make some art. He soldered up a Little Wire in dead bug style using a fine tipped soldering iron, stereo microscope, and 2 hours of his time. Check out below how this project ended up when encased in not so clear resin. My level of boredom […]
LOpen is a PIC-based logic probe that fits inside a pen. It detects if a pin is at a logic ‘High’, logic “Low”, or at high impedance (floating). This time it’s a Logic Pen controlled by a tiny 6-pin PIC10F202. The PCB is 5 cm by 5mm so it fits just fine inside a regular […]
DIY Audio function generator is a low-distortion function generator which operates in the Audio frequency range. Conventional function generators use a square wave signal to generate the other waveforms like triangle, or sine wave. This approach adds noise to the sine wave output, which is the one waveform Eric wants for his audio development. His […]
Arhi has been busy debugging noise from PTC type soldering iron sensors. The problem was the sensor’s sensitivity to the current used as a bias. If the current used is greater or less then 1mA the sensor picks up too much noise. In the latest revision of the Soldering iron driver both PTC and TC […]