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82 Threads found on edaboard.com: Mechanical Switch
Unclear what you want to do with the card related to light and AC. The card has no buttons, so it can't be used as remote control. A usual technique is to have a mechanical power switch activated for the room when the key card is stored in a respective holder. The operation is not specific to the type of card put in, and isn't needed to be.
Your question needs more detail. Are you talking about a mechanical signal switch relay? If so, it works exactly the same way as any other relay, an electromagnet pulls at a moveable contact to change it's connection state. High frequency signal relays work the same way but their contacts are arranged to keep impedance mismatching to a minimum
Perhaps you want an instantaneous cut-off when the set current limit is exceeded; it is not meaningful to involve the power or wattage at this point. A conventional triac cannot be turned-off for the remaining half-cycle. We obviously need another fast switch. mechanical switches (like relays) are too slow to act in quarter cycle; 5 ms is (...)
An SSR is probably the optimum part to use. Assuming your AC is 50Hz or 60Hz, each cycle lasts 20mS or less so if you turn it on and off 10 times per second, you have no more than 50% of one tenth of the time to enable the power, that only gives you a few mS in each burst. If you use a mechanical switch, whether reed or conventional relay, the time
I think that this is probably a rotary problem not a USB problem. A mechanical rotary encoder will occasionally send out the wrong code due to switch bounce. The only way to stop this is to either use a optical encoder or redesign the software to cope with errors from the rotary encoder.
A mechanical 3 pin switch uses center pin (POLE) to switch to Normally Open (NO) or closed (NC) positions. It depends if it is a slide switch, , rotary or toggle switch. For low current, you may need to bypass cap to clean non gold plated contacts from oxide. For better reliability, gold plated (...)
For that kind of application I use a lever microswitch. Most are change-over types so you can them to turn the lights on with the door open or closed by swaping one connection. The lever gives you plenty of adjustment range and minimal mechanical resistance. If you want to do it electronically, use the magnetic switch as before but wire it (...)
Hello experts, I am working with Solar Charge controller. For charging battery with solar there is a diode (.3v junction difference) between Solar positive and Battery positive. Diode protects the flow of current from battery to solar. That's good but during day time it makes up a good power loss (.3 volt X Current) so i need a heavy heat sink.
Best solution so far is a MCP9504 driving a FET, small and < $1 Realistically, you'll hardly find a mechanical thermostat with similar accuracy and size.
An electrical analog switch works like a relay - however, not mechanical but electrical. In principle, it is like a resistor between two nodes - input and output - which can be operated between two extreme values: Very large (megohm range, switch "open") and veryx small (milliohm range, switch closed). Such a (...)
Welcome to EDABoard Robin, asking questions like this is exactly what the board is designed to help with. The problem is because older cameras used a mechanical switch to trigger the flash, basically two metal contacts that close along with the shutter mechanism and let current flow between them. They do not care what the voltage is but on modern
its a mechanical mechanism. buy a cheap one off of ebay, and take it apart.
Why think so grandiose?.. Just use a self locking switch. ( these are DIFFERENT from on off switches), They have a mechanical 'latch' inside but the button ALWAYS returns to the start position, however the internal contacts 'remember' the state. So : 1.button down and up = switch internally 'closed' 2.button down and (...)
Presumed we are talking about mechanical relays or "contactors" (larger power relays). Theoretically you would want to switch a resistive AC load on or off during voltage zero crossing to reduce arcing. Practically, relays have considerable delay, often larger than 10 ms, so if you power the relay coil at zero crossing, the contact may close just a
Most modern components are hard metric, the de-facto standard for SMD components (IPC-7351) is metric based, all mechanical design is metric, so it makes common sense to layout PCBs in metric...I have done for years.
The contacts of the reed switch, any other mechanical switch or relay contacts bounce a few times when they open or close and the CD4017 will count every bounce. Then your counting sequence will get mixed up unless you use a debounce circuit or filter. I use TWO light bulbs in my washrooms in case one of them burns out then there is still l
What controls the switching circuit? Why can't you use a mechanical switch?
Hi, As said switching such a heavy load with mechanical contacts will always present problems. No mention what if any protection you have give any input leads / switch to the micro or what kind of pcb / ground plane etc you have used. No mention if the Resets occur at relay switch on or switch off, (...)
I think what you want is a limit switch. This is simply a mechanical switch with some type of actuating mechanism; something as simple as a lever arm. Look at this, for ideas
For my research I often have to compare the performance of different RF networks in a signal chain (for example, a LNA connected between an antenna and a mixer). Normally I have each stage as a separate PCB with BNC or SMC connectors, so I can manually arrange things how I want. But the problem with this is that the measurements are actually sensit