kabilan

Greetings! I am working on a project that will be able to remotely control certain appliances through the use of the telephone: http://www.electronic-circuits-diagrams.com/remotecontrolsimages/remotecontrolsckt2.shtml I understand that KT3170 is a DTMF Decoder IC, however this is not available locally in the PHILIPPINES. I am looking for an equivalent IC component for it. I have searched google and found that MC145436 and MT8870 can be used. I search on available electronic shops but there was no available ICs for the three(3) mentioned above. Is there anymore equivalent IC I can use as replacement? Thank you for the help.

hi guru, Thats great news, now I have some hopes ;). I will start constructing it and try your suggestion. I will let you know how it would go. Thank you very much, you ROCK!!! You are very cool 8)

hi guru, Thank you for the idea, I appreciate it. :D Is there any alternative I can do about it? What can I replace with that section? I see.... does that mean the photodiodes do have polarities? How should I be able to identify which terminal should I connect with it? (I should do some more research with photodiodes ;D)

Hi guys, I'm in an attempt to make a school project which will enable audio transmission over a laser medium 5mW/650nm. Here is the link where I got the idea http://captain.haddock.8m.com/laser/laser1.html . Does anyone ever tried building this circuit, was it working? I surveyed electronics shops for available materials for the construction. I found that I have to replace 2n5484 with 2n3819, and bc549 with pn2222 since it was not available. Is this just okay? I have a question with regard to the section where there is a 68 ohms NTC thermistor, the problem is there is no available 68 ohms but there is a 10 ohms NTC thermistor. What should I do with it? Is it okay if I removed the 68 ohms from the circuit or replaced it instead with the 10 ohms? Any ideas is greatly appreciated. regards, Kabilan

Hi Ante, Thank you for the warm welcome, I appreciate it. :) Do you have any URL link to any simple relay circuit which I can take as reference? Assuming I made a LOW STATE input, will the relay react with it and produce a 0V-0.2V output? I am going to connect the relay's output to the HT640 encoder's inputs. How about the ULN2803 is it safe to use it? ???

Hi guys, I am into parallel port programming. I want to use this to control the LED through VB6. From my research, I found out that before doing this I need to have a protection circuit to prevent any damage to the motherboard. I was told that an optocoupler was needed. However, optocouplers are a bit expensive if I had to have many outputs. So I was again told to make use of a TTL Buffer. Now the problem is that I don't have any idea of what TTL to use. I found 7407 or 7417 but don't have the idea of what the 30V/15V output indicate. Moreover, the 74367 is not available on the stores. Can you suggest what buffer should I use? Or, is there any better protection circuit other than the above mentioned? Thank you for the ideas. ;)