Effective single phase solid state relay for High-Risk Applications
Reliable single phase solid state relay Designs for Industrial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their entire range of single phase solid state relay . They offer a total set of single phase solid state relay solutions as well as other interrelated merchandise. These units are observed in distinct applications including industrial applications, industrial manage circuits along with OEM Panels. These devices include excellent precision and repeatability. The standard single phase solid state relay which can be created lately require pretty tiny panel space.
single 3 phase solid state relay
single three phase solid state relay
single three phase solid state relays
Description: Come with a aluminum heat sink provides long lasting usage, it will help dissipate the heat and protect your relay. Solid State Relay ideal for automatic process control application, a must component for temperature controller and other machinery control system.
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rigid asked keypad security door lock...?
i am making a keypad security door lock using the microcontroller 89c51. in this the password is entered by the user. the microcontroller matches the password with the default password if it is correct the door opens. the problem is i want to introduce the feature to change the default password. in other words the user should be able to set the default password of his on will. how can i do it.? another thing if the microcontroller is turned off the changed password will remain in the microcontroller and user can enter the new password to open the door. thank you
And got the following answer:
I've no idea where Fred comes off with "You can't" and "whole computer" and "4 to 5 times the price." A standard keylock featuring a keypad built into a standard door lock hardware frame runs about $100 (low end) to about $250 (high end.) An example of one at $119 is in the 1st link below. That commercial product, multiplied by 4 or 5 according to Fred, would set your max budget to beat what he is saying. Frankly, if you can't come in a LOT LESS than that, then you shouldn't be bothering to try at all. You can buy (over ebay) a keypad for about $1 and for ones with actual plungers in the keys are about $4 or so. A complete 32-bit microcontroller with ¼ megabyte of flash and 48 kbyte and a lot of extras (like a 3D accelerometer, 3D gyro, and compass) is a mere $11 from Digikey. (STM32F3DISCOVERY) See 2nd link below. Price is $10.90 in ones. But you could get by with an under $2 microcontroller for this work, frankly. You just need an internal EEPROM in one and at under $2 there are a lot of choices. The main problems are all mechanical stuff related to installation and the solenoid used to unlock the door. I'm actually in the process of developing a 220VAC (both phases of a single phase household system) lock that uses 40kHz ultrasound to ensure that the operator of a home stove system doesn't leave the area when it is on. It will have a full keypad, display, locking codes, the ability to change them of course, two 40kHz sensor system (they are about $3 each from ebay) for full angular coverage of the area, a keypad system, and both an SSR (solid state relay that I will operate at 0° phase angle) and a regular power relay which will do the heavy lifting afterwards. (The SSR will act to protect the relay contacts, but because it dissipates power will not be the active unit while the stove is operating thereby allowing me to use a much lower powered [cheaper] SSR circuit.) It's all really a piece of cake. Just do it. As far as being able to change passwords, almost EVERY micro out there either includes internal EEPROM, which is a decent place to store such changed codes, or else can support any number of the external serial EEPROMs that exist (and cost NOTHING to speak of.)
The single phase solid state relay function extremely well with different applications that happen to be particular to power distribution and protection. The relays come with wide adjustment ranges having a scale that may be simple to read either in 3 or four digits based on the model. These single phase solid state relay aid in escalating the flexibility in the applications, decrease the all round power and maintenance expenses. There are relays which are made use of for basic purposes which come in dependable styles with fast replacement choices. And you will discover models which are made use of for industrial applications and heavier duty applications that perform on substantial loads. These goods are created to meet the lifetime industrial control requires of your applications.
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