DTMF based FM Remote Control Circuit

该职位讨论了基于DTM的FM遥控电路，可用于通过按下DTMF发射机手机上的四个相应的按钮来远程控制4个单独的设备。Sunaabh Sarkar先生要求这个想法。

技术规格

当我对一些电路谷歌曲时，我越来越多地遇到了你的博客“为你自制设计”，并且坦率地坦率地说，我的意见对你的意见感到非常深刻。

我是专业的建筑师，但是当我的第一选择后，它的摄影就是播种。电子产品。作为一个孩子，在大约4年前，我曾经着迷于从海军NCC级别的美国电子实验室中船上观看我的同事。

这passion has remained in the heart and now when I was forced to take a 'retired back seat' from my active profession due to some unavoidable circumstances, I thought the time to be right to pursue what I had always wanted to do in my heart. Build working model of Ships... well just for the fun.

I started with the old worn out RC toys my kids used to play with by "reverse engineering them" to my benefit while building the 5 vessels (all out of household wastes like old ball pens, remote control covers, discarded flexible conduit pipes, plastic bottles and things like those),

I have so far built. When there were no more old RC toys around, I would go and buy some new cheap ones and used the electronics to power my models.

新的或旧的，市售的RC单元具有它们的限制（如范围或性能）。

这professional ones other modellers use come with their own hitches and which if not for their exorbitant prices, they have remained unavailable for one reason or the other.

我希望我有机会学习电子产品作为我高等教育的主题，以便我可以设计电子电路而不是设计房屋;）。

However, I had this idea lingering on for quite some time, though I confess its not unique or new... controlling devices using DTMF codes. Ever since Cellphones have taken the front seats, push button land line phones have become vogue and I had been contemplating powering up one of them to generate DTMF codes... then feeding these codes to an audio transmitter in the FM range.

发送的信号可以由FM接收器接收。然后可以通过解码电路解码传输的DTMF音调，以触发至少6个驾驶玩具电机的单个电路。但我是我，我只能梦想。

Googling does me little help. There are some circuits available on line, but they require programming too... well at my age I guess by the time I get to know how to write a program and make use of one, there will be little left of my dwindling eyesight to build my dream ship.

I was wondering if you could kindly help me by designing/ suggesting/ helping me put together circuits for a simple DTMF interface to easily accomplish my target using simple circuits and passive components.

对于所有的麻烦，你不得不煞费苦心地通过我的邮件，也为你的努力和时间来帮助我，坦率地说，我可以提供的所有薪酬是我的美好祝福和衷心的感谢和感激。

Thanks and regards and TC. God Bless

Sunaabh Sarkar (Mistral)

这电路设计

A couple of DTMF based FM remote control circuits can be seen in the following diagrams based on the proposed request.

第一图是DTMF发射器电路，而第二个是DTMF接收器电路。

我们都基本上知道DTMF编码器/解码器电路如何通过处理唯一配置的双频音，为封闭式键盘的特定按钮唯一配置。

它普遍用于电信领域是电话的键盘被分配了这些代码（DTMF），用于使相应的接收器结束识别按下按钮并准确地完成呼叫连接过程。

DTMF发射器阶段

在第一DTMF FM发射器电路中，使用DTMF发生器IC 5089并以其标准形式配置。通过在其引脚＃16处生成相关的高/低音组合，响应所连接的键盘按钮的响应。

该DTMF输出被馈送到FM发射器电路，拾取音频数据并通过其天线在空中传输。

这shown FM transmitter stage is a bit different from the ordinary ones as it encloses an additional stage in the form of T3 and a centered tapped LC tank network.

这一修改使它更强大的比ordinary single transistor types and enhances it with a higher transmitting range.

COMPLETE INFORMATION REGARDING THE TRANSMITTER STAGE CAN BE FOUNDHERE

电路Diagram

DTMF Receiver Stage

Since the above explained DTMF transmitter circuit uses an FM topology, the receiver must be an FM based too, for capturing and processing the transmitted data.

普通的FM收音机或接收卡是从发射机单元收集传输的信息所需的所有内容。

这received DTMF audio by the receiver is next forwarded to a standard M8870 DTMF decoder circuit stage which effectively detects and processes the DTMF data received by the FM radio.

As per the specifications of the IC, its outputs correspondingly switch ON and OFF in accordance with the DTMF tones generated and transmitted by the transmitter stage.

这above switching of the outputs of M8870 IC is integrated to 4 discretely configured IC 4013 based flip flop stages which respond by toggling the attached relay driver stages.

这relays can be wired to the relevant loads for achieving the intended switching via the DTMF transmitter handset.

接收器电路DTMF.