Superior 12vdc time delay relay On-line via Any Electronics Co., Ltd.
The organization specializes in supplying electronic products such as 12vdc time delay relay, programmable timers, programmable digital timers, proximity switches, inductive linear sensors, photo-electronic switches, optical screen sensors, strong state relay, and switch energy provide, among others. The consumer friendly internet site aims to provide great quality at affordable rates to service seekers across the globe.
Located in China?¡¥s Liushi, Any Electronics is actually a firm that prides itself on consistently adapting to technological improvement. The enterprise provides solutions in machinery manufacturing, motor technique control, distribution transmission, control device, oil and mining, automation industry, solar handle, lighting control and other such areas. The organization also supplies new product improvement and OEM solutions. All services presented are strictly in accordance with ISO9002.
Superior 12vdc time delay relay On the web by way of Any Electronics Co., Ltd.
The firm specializes in offering electronic merchandise which include 12vdc time delay relay, programmable timers, programmable digital timers, proximity switches, inductive linear sensors, photo-electronic switches, optical screen sensors, strong state relay, and switch power supply, amongst others. The client friendly site aims to deliver excellent quality at inexpensive costs to service seekers across the globe.
Located in China?¡¥s Liushi, Any Electronics is actually a company that prides itself on constantly adapting to technological development. The firm supplies services in machinery manufacturing, motor technique handle, distribution transmission, manage device, oil and mining, automation market, solar manage, lighting manage as well as other such areas. The company also supplies new solution development and OEM solutions. All services supplied are strictly in line with ISO9002.
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I'm holding a relay coil shut with a 12VDC / 500ma transformer (wall wort). The output of the relay is connected to a normally closed zone in my alarm system. I use this to tell me if the power has gone off while I'm not at home. However, with the transformer and relay only, I get no "power off" delay before the zone goes into alarm. Ideally, I'd like to get about a 30-60 second delay so that it won't go into alarm for short power outages. I don't have any way to do this through the alarm panel, so I need an electronic solution. I'm aware of a device which already does this (http://www.smarthome.com/7154.html) but I think I can do it cheaper with a capacitor (2, 3 .. ?) and a bleed resistor. Does anyone know the math and/or can you provide an answer to what size caps I need?
And got the following answer:
Trying to answer but YA taking breather. Or is it??? Edit: No it just doesn't want to display my answer. Try again... I may be reading your question wrong, but it looks like you want to charge the capacitor from the power supply, in such a way that if the power goes off the voltage on the capacitor will hold the relay closed for 30-60 seconds, until the capacitor discharges. That would work, but it is clunky, and you will need a big capacitor. Assuming that the relay will continue to hold closed until the voltage drops to about 60% of normal, C = 2 * T / R where R = the coil resistance of the relay Let's say you have a very small, low power relay with coil resistance 1200 ohms. For 30 seconds: C = 60 / 1200 = 0.05F = 50,000uF You would probably go for an aluminium electrolytic cap 47,000 uF, 16V. If your relay has a lower resistance coil, which it probably does, you will need a bigger capacitor, or several in parallel. You may need to charge the cap through a rectifier diode like 1N4001, so that when the power fails it doesn't discharge back through the power supply. The way I would do it is to use a darlington transistor, FET or solid-state relay to switch the line. Then you can do the same thing but with a much smaller capacitor, and you can run it from a battery or power direct from mains through a capacitor / rectifier circuit. Don't try that latter idea unless you know what I'm talking about, it's very easy to kill yourself...
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The web page also functions a video section with tutorials that especially clarify the 12vdc time delay relay many electronic solutions that the organization specializes in.
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Any Electronics is geared to delivering its clients together with the ideal attainable service when it comes to value for price tag. In regard to consumer care service the web-site offers a Skype service exactly where clientele are capable to speak to acceptable consultants to clarify any concerns. There’s also a type offered on the website where service seekers can fill in any queries they might have or feedback they might prefer to provide.
The company caters to countries all over the world. Its clientele contains countries from the USA, Europe, South East Asia, and Southern Africa. Any Electronics Co., Ltd. also functions as an agent for Temperature timers in Taiwan. The internet site states that the explanation behind its international success would be the superb high-quality of its electronic items. Additionally, the cost quotations presented are reasonable in regard to the superior worth of its solutions.