Reed contacts feature many properties, by which they considerably outperforms standard switching technologies. Components from company Meder electronic belong to a top in this segment.
A reed switch operates on a principle of deformation of magnetically conductive blades in a magnetic field. It can be said, that the most of reed switches outstanding properties results from the fact, that the reed themselves are small, light-weight and distant only few hundredth of milimeter (at small types). At the same time, they are hermetically sealed in a glass capsule in a vacuum, or more often – filled by an inert gas. Thanks to this construction, Meder electronic reed contacts (and on their basis produced reed relays and reed sensors) feature mainly these properties:
A reed contact can be considered to be a “sensor” controlled by a magnetic field, the most often by a permanent magnet or by a coil, creating a reed relay. Components with reed contacts can be divided to three basic groups – reed contacts, reed sensors and reed relays. Reed relays themselves, soldered into a PCB, can serve for many applications like for example a monitoring of a position (for example closing of a door, end positions of various mechanisms, …), counting of goods, etc. However, from mounting and mechanical protection point of view, in praxis the reed sensors are usually more convenient, as they are optimized exactly according for a given application. Reed relays offer all above-mentioned features of reed contacts, thus being an ideal choice for example in a measurement equipment, HF/ audio/ video and other devices with small signals, at switching of high voltages and in many other applications. Small dimensions, very low power consumption of common relays (50-125 mW), extreme reliability and a relatively low price are another arguments for usage of components from company Meder electronic. Many useful informations can be found in documents „The Basic Reed Switch“, „Reedswitch used with permanent magnet“, „Reed Switch used as Reed Relay“ and „Parameters_of_Reed_Switch“.
Wouldn´t a reed switch suit to you? - [Link]
Two independent touch switches housed in a single 8 pin chip. Power supply between 2V and 5V. New version 2.0 has Individually configurable momentary or latching operation.
Have you have ever wanted to add a simple touch switch to your project? Well now you can with our touch switch IC you can now add momentary or locking touch switch functionality.
- For momentary operation connect the CFG1 / CFG2 pin to Ground.
- For latching operation, connect the CFG1 / CFG2 pin to +VDD.
Touch Switch IC - [Link]
Derek Wolfe writes:
This circuit allows a simple switch or a low voltage pulse (5V for example) to control a large dc load. There’s a good explanation of MOSFET transistors and how to use them as a switch here. This is great for connecting a large load to a microcontroller or other logic circuit. Power MOSFET transistors are perfect for this application and can handle high voltage and current (100V, 77A for the NTP6411). This design would be able to power almost any load you can think of (probably even your car).
N-Ch Power MOSFET Switch - [Link]
The temperature switch IC inverts the output according to the detected temperature, enabling a simple circuit configuration ideal for reducing costs and space in a system.
In a temperature switch that is configured using a thermistor, a comparison circuit is required downstream. However, this circuit is not required in SII’s temperature switch IC because the IC inverts the output when the detected temperature reaches a preset value. This makes the IC ideal for reducing costs and saving space in the customer’s system.
In the temperature switch ICs, the output is inverted when the temperature exceeds the set value.
The following temperature switch ICs are available: a latch type that maintains an inverted state (latch) to prevent an unstable output at the detected temperature and a hysteresis type that releases the inverted state when the temperature decreases to the set value.
S-5840B / S-5841 – Temperature Switch ICs - [Link]
Sergei Bezrukov writes:
It is not a rare phenomenon that some USB devices attached to a computer during power-up remain invisible to the OS after booting. This concerns home-made devices during experiments and also some commercial ones. To make them visible again one has to disconnect the USB plug and reconnect it again. This leads to excessive contact wear of the USB connector. It would be nice to have a way to reconnect the device without mechanically unplugging it. A trivial solution based on buttons/switches or relays won’t work because of their contact bouncing, which might confuse as device as well as the OS.
USB switch - [Link]
If you´re searching for a rocker switch with small dimensions and a great design, then you shouldn´t overlook the Marquardt 1858.
Marquardt 1858 is a miniature 2-pole switch with 10A/250VAC rating, made of immediately self-extinguishing material (UL-94V0). Inspite of small dimensions it handles up to 100A inrush (capacitive) currents. Silver plated terminals provide a low resistance and a safe plugging of connectors (fastons) is ensured by double fixing of terminals in the switch housing. Ambient temperature on the terminals side can be up to 100°C, what enables to use the switch even in pent conditions of power applications. For an increased dust and water protection you can use the 203.089.011 transparent cover. The switch surface is silky matt with an abrasion-proof marking.
Small dimensions and an elegant design make the Marquardt 1858 switch suitable for applications like for example a main power switch of various devices, as well as for a control of peripherials. In the 1858 series there are available switches in various versions, in stock we keep 1858.1103 type. Detailed information will provide you the Marquardt 1858 datasheet as well as Marquardt switches overview.
Elegant, miniature, powerful – Marquardt 1858 double switch - [Link]
MCP9501/2/3/4 family of devices are temperature switches with ±1°C (typical) accurate factory set output thresholds. These devices are ideal for high power supply systems where an overtemperature protection circuit is needed. These devices do not require external components, consume 25 μA (typical), and the factory set thresholds provide simplicity.
MCP9501 – Temperature Switch with Selectable Hysteresis - [Link]
These chrome-plated metal buttons are rugged and waterproof and look real good while doing it! Simply drill a 16mm hole into any material up to 1/2″ thick and you can fit these in place, there’s even a rubber gasket to keep any water out of the enclosure. On the front of the button is a flat metal actuator, surrounded by a green plastic LED ring. On the back there are 3 contacts for the button (common, normally-open and normally-closed) and 2 for the blue LED ring (+ and -). Connect 3 to 6V to the LED to have it light up nicely, there’s a built in resistor! If you want to use this with a higher voltage, say 12V or 24V, simply add a 470 ohm resistor in series with the LED connection to keep the LED current at around 20mA.
Waterproof Metal On/Off Switch with Green LED Ring - [Link]
Light Switch XBee: Example Project by Rob Faludi. [via]
Just finished documenting the latest example project. The Light Switch XBee is a wireless wall switch that can control lamps, fans, motors or your homemade robot using Digi’s XBee radio. It’s a model for almost any digital input device you’d like to build. If it goes on and off, you can make it wireless using this example as your guide!
Light Switch XBee: Example Project - [Link]
This week I’m presenting a project easy to build and it might be in interest of automobile enthusiasts.
Certain vehicles, like Mercedes, BMWs and others, have a system that turns the cabin light off a few seconds after the doors are locked and with a fade-out effect .
This project does that.
The soul of the circuit is a 12F615 microcontroller. Pins 2 and 3 will be connected to jumpers that, either connected to 5V or 0V change the behavior of the circuit.
On/Off switch with fade effect - [Link]