Make sure your optocoupler is properly biased
02.21.2018 · Articles
In isolated power supplies, optocouplers pass the feedback signal across the isolation boundary. Optocouplers contain both a light-emitting diode and a photo detector. Current flowing through the LED results in a proportional current flowing in the photo detector...
Vintage electrical measuring instruments from the 1950s
02.06.2018 · Articles
When EDN published its first issue in 1956, electrical measuring instruments looked a little different than they do today. Howard Skolnik, a former colleague and key analog mentor from my Burr-Brown days, has always had a passion for significant products made by pioneering electrical instrument companies and has accumulated a large collection over the years that includes Burr-Brown, General Radio, Leeds, and Northrup and Weston...
Inside an isolated RS-485 transceiver
01.24.2018 · Articles
Isolation is a means of preventing current flow between two communicating points, while allowing data and power signal transmission between them. Isolation prevents high voltages from damaging sensitive electronic components or harming humans. It also eliminates ground loops in communication links with large ground potential differences to maintain signal integrity...
Simple Transient-Response Measurement Determines Power-Supply Bandwidth
01.11.2018 · Articles
It’s normal to assume that there’s an easy way to relate the bandwidth of a power-supply control loop to its transient response – no good reference exists that defines this in simple terms. It seems like a straightforward problem, which should have a simple solution. The higher the bandwidth, the faster the loop responds, and with less voltage deviation...
Synthesized Inductor Delivers Maximum Power Transfer
12.28.2017 · Articles
To transfer maximum power from a circuit to a load, the load’s resistance, RL, must match the source resistance, RO. In the case of a complex load, ZL, and a resistive source, this transfer can require the use of a bulky inductor. This idea shows how to replace the physical inductor with a smaller synthesized inductor...
10 Best Raspberry Pi and Pi 2 Alternatives. Part 2
There are actually two versions of the MinnowBoard MAX available; a $140 version and a $100 version. The extra $40 gets you 2 GB of RAM instead of 1 GB, but both versions include a 1.33 GHz dual-core processor...
10 Best Raspberry Pi and Pi 2 Alternatives. Part 1
The Raspberry Pi and Pi 2 have taken the world by storm and created a huge interest in single-board computers; their simplicity, portability, and affordability make them great for thinkerers and kids alike. But not everyone wants a Pi...
Generate A Differential Signal Using A Transformer Plus Signal Splitter
12.06.2017 · Articles
Most function generators and network analyzers have one port to provide the output signal. If a differential signal is needed, then you may need to acquire a network analyzer with two output ports at great cost. Of course, there are alternate solutions in generating a differential signal without acquiring expensive equipment...
Digital Potentiometers vs. Mechanical Potentiometers: Important Design Considerations to Maximize System Performance
11.30.2017 · Articles
This article will provide design details on how to use digital potentiometers with other components highlighting the important considerations and specifications for each use case to ensure the designer gets the best possible system performance. Important design considerations and specifications that should be taken into account when combining digital potentiometers with other components, such as op amps to cre-ate flexible multiuse systems will be addressed...