reed switch

ANY Timer Switch
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Superior reed switch Online by means of Any Electronics Co., Ltd.
The business specializes in giving electronic merchandise such as reed switch, programmable timers, programmable digital timers, proximity switches, inductive linear sensors, photo-electronic switches, optical screen sensors, solid state relay, and switch energy provide, among others. The client friendly web page aims to provide fantastic high quality at inexpensive costs to service seekers across the globe.
Located in China?¡¥s Liushi, Any Electronics can be a organization that prides itself on consistently adapting to technological improvement. The business supplies services in machinery manufacturing, motor system control, distribution transmission, handle device, oil and mining, automation industry, solar handle, lighting control along with other such areas. The organization also supplies new solution improvement and OEM services. All services supplied are strictly based on ISO9002.
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JackY87 asked How can I make a simple tachometer to measure rotation speed by using reed switch?

I don't know the sensor/reed switch should be connected to the + or - input of the Op Amp, and I often saw a charge pump is included in a circuit which i don't know what it is, can anyone give me some clues on how to build the circuit?

And got the following answer:

Probably the simplest is to have an analog meter as the readout. To do this, you use the reed switch in series with a resistor across a power supply and then take the pulses to trigger a monostable. I like the 74C221 as a very versatile monostable. Do not use a 555 in this case. You set the timing components so that there is a brief positive going pulse produced at the output of the monostable for each rotation. The output pulses will then be a series of very short pulses which you take to the meter via a resistor. The more of these short pulses there are the higher will be the meter reading. You can adjust the pulse width so that the meter calibrations are meaningful in terms of RPM. The resistor in series with the meter is arranged to give a full scale reading when connected to the power supply voltage. So the meter can't read more than full scale. The circuit would just have a 74C221 and a few minor components plus a moving coil meter. Pretty simple.


The web site sports an in depth catalogue showcasing its merchandise. In conjunction with several descriptive photographs the catalogue incorporates solution facts for instance product size, installation information, and solution functionality details.
The site also functions a video section with tutorials that specifically explain the reed switch various electronic products that the organization specializes in.
Service seekers are in a position to view the solutions either in line with the Product Categories provided or the newest Solutions and even Function Merchandise. The most recent merchandise involve such products as Holiday Time Switch ATP 1006-5, Solid State Relay SSR3, reed switch, and Preset Counter AH5K. There’s also the choice for prospects to view certain merchandise with the search engine provided on the web page.
The Any Electronics organization web site also showcases a weblog for customers to get a comprehensive understanding on the electronic merchandise provided.
Any Electronics is geared to delivering its consumers with the finest attainable service with regards to worth for value. In regard to client care service the web site provides a Skype service where clientele are in a position to speak to acceptable consultants to clarify any queries. There’s also a type provided around the site where service seekers can fill in any queries they may have or feedback they may prefer to offer you.
The company caters to countries around the globe. Its clientele contains nations in the USA, Europe, South East Asia, and Southern Africa. Any Electronics Co., Ltd. also functions as an agent for Temperature timers in Taiwan. The web-site states that the cause behind its worldwide results is definitely the excellent quality of its electronic things. Additionally, the cost quotations presented are reasonable in regard to the superior value of its solutions.

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