One of my electronics interests is building radios, particularly those featured in older UK electronics magazines such as Practical Wireless...
An off-line power supply
Bidirectional solid state relay
The circuit below can switch up to 4 Amps of current with a peak voltage up to 20 V. It is fully isolated using two inexpensive red LEDs...
Simple, compact circuit conveniently controls devices and systems
This easy-to-build PWM source is a handy testing tool for hobbyists, technicians, engineers and other RC-based device developers...
Medium power 12V brush motor speed controller
In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed...
Logic controlled 12V DC motor with automatic brake
There are times when you would like to control a DC motor using a simple +5 V logic swing signal. The circuit below performs this feat and also includes an automatic motor braking circuit...
Toshiba releases high-speed 2:1 multiplexer / 1:2 demultiplexer switches for industrial applications
Toshiba Electronics Europe introduces TDS5B212MX and TDS5C212MX, multiplexer / demultiplexer switches for high-speed differential signals...
Build a practical 400 mA linear Li-ion charger with visible CC-CV behavior
Single-cell lithium-ion chargers are widely used, yet many practical designs rely on highly integrated ICs that conceal their internal operation...
Asahi Kasei Microdevices begins mass production of camera-less modules for detection of falls, vital signs, posture, and position
Asahi Kasei Microdevices began mass production of the AK5816AIM, an Antenna-in-Module millimeter-wave radar module...
Now and then: minicomputers
For some time, minicomputers were a dominant force in computing. But where do they stand now?...
One-input numeric keypad
This is a 12-key numeric keypad for use in a range of microcontroller projects. It has the advantage that you only need one analogue input...