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20 Mar 2014

vpapanik demonstrates the EM-1712 magnetic on-off switch on the breadboard:

Ultra-low standby current (less than 0.1 mA) magnetic on-off switch based on the AKM micropower hall bipolar latch EM-1712 and Microchip MCP1801 3.3V LDO. Of course, any regulator with EN (or SHDN) pin can be used. Ideal for touchless power switching, e.g. battery operated devices in watertight enclosures.

Micropower magnetic on-off switch - [Link]

30 Jan 2014


The Ethos lite is a tiny unmanaged Ethernet switch that has 5 ports, supports 10/100mb data rates on a board measuring just 1.75″ x 1.75″ and weighing only 15 grams. One primary area where the Ethos lite stands out is in situations where weight and power are high priorities such as Unmanned Aerial Vehicles or robotics. All 5 ports are fully shielded with magnetic couplers for common mode rejection meeting Ethernet wiring specifications. This allows designers the ability to skip the large RJ45 connectors and wire directly onto connected peripherals or place the connectors in a more flexible location.

The Ethos board can accept a wide range of voltage input from 5-15V making it an ideal fit for Unmanned Systems that provide battery power. The Ethos board can also double as a 3.3V regulator providing up to 1 Amp of current. Under full load (all 5 ports actively sending data) the Ethos consumes less than 2 Watts.

Connections to the Ethos lite are provided by Molex PicoBlade headers with one for each port and an additional connector for power. As an added feature the MDIO lines to the Ethernet switch IC have been exported allowing developers access to management data registers.

Included with the Ethos lite is the main board along with 6 Molex PicoBlade cables (5 with RJ45 connectors, 1 with bare wires for power). The Ethos lite costs $250 with the ability to purchase extra Molex cables in a variety of configurations.

Gadgetsmyth releases the Ethos lite – A tiny Ethernet Switch – [Link]

17 Sep 2013


Anthony H Smith writes:

The circuit in Figure 1 lets you switch high-voltage power to a grounded load with a low-voltage control signal. The circuit also functions as a submicrosecond circuit breaker that protects the power source against load faults. Power switches to the load when you apply a logic-level signal to the output control terminal. When the signal is lower than 0.7V, transistor Q3 is off and the gate of P-channel MOSFET Q4 pulls up to the positive supply through R6, thus holding Q4 off. During this off condition, the circuit’s quiescent-current drain is 0A.

Inexpensive power switch includes submicrosecond circuit breaker - [Link]

9 Aug 2013


When the circuit is powered up, all of the transistors are off and stay off. C1 gets pulled up to Vp. When the switch is pushed, Q3 and Q2 turn on, since their base is pulled up. Q1 and Q4 are in turned on as well. Q1 keeps Q2 turned on and Q2 keeps Q3 turned on and Q3 keeps Q4 turned on. Q4 supplies current to the load. When Q2 is asserted it keeps pin 1 of SW1 at ground.

When the switch is pulled low again, the base of Q3 is tied to ground, because Q2 is on, and the chain is broken an all of the transistors turn off.

C1 and R1 and R5 form the time constant for the debounce circuit. Adjust these values for an appropriate debounce time.

Latching Momentary Switch for breadboard - [Link]

29 Jul 2013


The MAX14777 quad SPST switch supports analog signals above and below the rails with a single 3.0V to 5.5V supply. The device features a selectable -15V/+35V or -15V/+15V analog signal range for all switches. Each switch has a separate control input to allow independent switching, making the device an alternative to opto-relays in applications that do not need galvanic isolation.

The IC features 10Ω (max) on-resistance, and 9mΩ (typ) RON flatness, along with a low 50nA (max at +85°C) on-leakage. For maximum signal integrity, the device keeps this performance over the entire common-mode voltage range. Each switch can carry up to 60mA (max) of continuous current in either direction.

MAX14777 – Quad Beyond-the-Rails -15V to +35V Analog Switch - [Link]

17 Jul 2013


Top quality rocker switch with an IP65 protection can be available even for a very competitive price. It is the case of a novelty in our offer – Marquardt 1932.3112.

Series 1930 may be probably familiar to you, for example from our article Series 1930 – Double Pole Rocker Switches with IP65. Till now, we had in stock types 1935.x with green and red backlight.

We react to your requests for switch with the same excellent properties but without a backlight and for as good price as possible. Type 1932.3112 from company Marquardt features an advanced construction with an integrated gasket, thus the switch doesn´t require any other sealing or a special assembly procedure to reach IP 65.
With the price under 2 EUR/ pcs and a considerable stock level, we´re able to offer you a top quality switch for a very affordable price. The switch contains a reliable mechanism with a long lifetime and handles up to 120A inrush (capacitive) current.

In case of interest even in other versions, please contact us at info@soselectronic.com.

Say stop to dust and water with the Marquardt 1932 switch – [Link]

3 Jul 2013


Mats continues his challenge of designing one PCB every week. In week 12 he came up with BB Prince, a small multi-purpose utility for your solderless breadboard:

This PAW is a small utility board for your breadboard that have some of the most common things you need when building a microcontroller-based project on the breadboard. It’s a small (2.5×1.5cm / 1×0.6”) PCB with a Power Led, a Reset button with a pullup and goes low when pressed, a Signal button with pulldown that goed high when pressed and two general Indicator Leds that are connected to ground via resistors.


BB Prince – breadboard utility PCB - [Link]

14 May 2013


Push-buttons resistant to dust and water, moreover with the well-visible LED backlight, will manage even rough handling.

If you have an application, where you need sturdy push-buttons and ideally even with backlight, then the Schurter MSM19 may be the right for you. Dust- and water-proof push-buttons can be advantageous not only in an expressly demanding industrial environment, but also in a common indoor environment, when they´re supposed to be frequently used, for example in various information or control panels etc. Right such a “harmless” environment can be easily dangerous thanks to wet hands, spilled coffee, …

Push-buttons Schurter MSM series feature a similar usage like MCS series, but it features a higher protection class – IP67 (from the actuator side). In the MSM series can be found several versions, in stock we keep 2 types – 1241.6624.x  with a ring green or red backlight (powered by 24VDC). Transparent ring from polyamide is of a neutral color (in off state of LED).

MSM series is constructed modularly, i.e. consists of the stainless steel body and the micro-switch which determines its electrical properties. MSM series can be equipped by various tact switches – 2 Types which we keep in stock are equipped with the type 1050.1151 from company Marquardt. Mid-rated force of 4,5N necessary to push the switch and the 1mm travel make these push-buttons very pleasant for handling. Gold-plated contacts of the micro-switch enable also to switch very small currents.

Detailed information will provide you the Schurter MSM datasheet.  In case of interest, please contact us at info@soselectronic.com.

Resistant and irresistibly beautiful push-buttons Schurter MSM 19 - [Link]

30 Apr 2013


Drawing only microamps (other than load current), this circuit switches in accordance with ambient light levels. Raju Baddi writes:

You can use an LED as a photoelectric sensor. A previous Design Idea shows that such a switch is highly power-efficient, consuming almost no power (Reference 1). However, you cannot adjust that configuration to switch at the desired light intensity. You can adjust the circuit in this Design Idea to any threshold level of light intensity necessary to maintain the on state of the photoelectric switch while retaining almost the same power efficiency of the original circuit

Adjust power-efficient LED switch to any light intensity – [Link]

30 Mar 2013


Switch-on, switch-off, change-over, change polarity,… all this is possible with 2-pole push-buttons switches of Unimec series.

If we design a device with push buttons, it is usually advantageous when we can use the same push-buttons, independently on whether we use them for switch-on, switch-off, change-over,… Moreover, at a modification of a given device, a possibility to change the function of a given push-button without its exchange is often highly welcome. Unimec series push-buttons easily meet these requirements for versatility, what probably was a reason why a word „Uni“ is also in the name of this series. The quality of the Unimec series is also guaranteed by the fact that company MEC from Denmark already for 75 years develops and produces top quality push-buttons.

Unimec push-buttons can be used by up to eight ways, as illustrated in the attached diagram. Unimec are available as momentary or latching and also in a standard or a high-temperature version (for operation at up to +160°C). Unimec are also available with silver-plated conacts (for currents from 0.5 mA) and also with gold-plated contacts, for currents already from 0.5 uA. Maximum current of 250mA (up to 500mA in a steady state) allows a universal usage, including a direct switching of many components, like for example latching relays. High-quality plastics, inner parts made of stainless-steel and an IP54 protection give a presumption of a long lifetime of these push-buttons.

Unimec series can be used with various key-caps without or with indication LEDs. Moreover, with the 16.250 adapter it is possible to use a wide spectrum of key-caps from the Multimec series. Detailed information will provide you the Unimec datasheet.

Selected types we keep in stock, upon request we´re able to provide you any other types of the Unimec series. In case of interest, please contact us at info@soselectronic.com.

Switches MEC Unimec switch in up to eight ways - [Link]





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