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  1. L

    Keys finder circuit

    after changing the IC, now it is working. but for some reason i will need to use my hand and touch the circuit then only is working. if i didn't do that, when the circuit is trigger, it will buzzing, stop, buzzing, as i mention it before. some have i mannage to use my whislte to trigger the...
  2. L

    Keys finder circuit

    hello, when i made a whistle the circuit cant be trigger, but then i knock on the table it start buzzing n when i made a loud sound. does that means the piezo i get is not good? becoz when i say piezo tranducer the shop keeper say no idea, so i get the piezo that without oscillator. after that...
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    Keys finder circuit

    buy why when using a 9V battery will work instead of 12V battery? 12V battery low current? oh ya, mayi have your name? i m doing this as a project, can i put your name in my report?
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    Keys finder circuit

    after i change the 12V with a 9V battery, it works fine, it also can receive signal. but it seem like only whistle will not be able to trigger the circuit, i will need sound that louder. when i test wif power supply again, reduce the current, it seem like continuous beeping again, why? i did...
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    Keys finder circuit

    i m using a 12V battery to test it, but when i using a 12v power supply it works fine. the only thing is that the mic cant pick up signal. can i put a mic parallel with the piezo, so that it can receive the whistle or some other signal. btw way, can i increase the gain of the amplifier...
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    Keys finder circuit

    mp3 is just a audio file, any media player will be able to play it. just in case here is the zip format, because this forum does not allow to attach mp3 files, i ll need to zip it up. now the problem i m facing is that, when i connect the circuit to the battery, the piezo will start buzzing for...
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    Keys finder circuit

    after testing the circuit part by part, the circuit oscillation part finally working (i think so). but when i connect it to the battry,  the piezo start buzzing, after few second it stop. and then start buzzing again. when i short the base of T1, the sound will non stop buzzing. R5 C3 N4 is...
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    Keys finder circuit

    now i only connect N5, N6 R8, R9, C5. n connect the pie at output of N6 to the ground. there is a buzzing sound coming out. is this suppose to be the output sound? in this circuit T1 n T2 is suppose to be acts as switch? when the T2 turn on, the piezo is going to triggered, why and how? where...
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    Keys finder circuit

    sorry to trouble you again, i have just reconnect the circuit few times, but now when i gound the base of T1, it also do not have any sound. do you mind to explain everything? can i test the oscillator it self? with only the N5 N6 R8 R9 C5 how should i connect it to do piezo? connect the...
  10. L

    Keys finder circuit

    i have tested manually by turning on the T1, n let T2 on, in this case, you say that it will be triggered.but the sound is so soft can i increase the volume. but when i connect acorrding the circuit diagram given, the sound is also be triggered without any wistle. but the only different...
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    Keys finder circuit

    haha... my place here is almost reaching sleepying time, maybe thats why that kind of sound is coming out. 8)
  12. L

    Keys finder circuit

    it sound like ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZzzzzzzzzzzz almost sound like tat, i dunno how to put it in words
  13. L

    Keys finder circuit

    thank you very much, i have really understand the circuit now. as for the fizzle sound,  when i connect the circuit with a buzzer, there is some sound coming out from non stop. but it is very soft, i think that should be the fizzling sound.
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    Keys finder circuit

    :o  thx for all the information. here it say that N4, C3 and R5 will ensures that the circuit will not trigger from common noise, what does it mean? is this consider as a filter? can i change the value so that i would need a high pitch voice to activated it? how is the calculation? after that...
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    Keys finder circuit

    Posted by: Alun  Posted on: May 28, 2005, 02:20:24 PM Insert Quote I forgot to say, the only difference between a piezo transducer and piezo buzzer element it a buzzer element has an extra feedback lead, a transducer just has drive and ground leads. Just connect the feedback and driver...
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    Keys finder circuit

    i m still very blur with the piezo thing. from the site http://www.murata.com/catalog/p15e6.pdf it say that external drive: 2 terminal selfdrive : 3 terminal and what i found out from website that sell these component say that piezo buzzer or transducer each of them is also having selfdrive...
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    Keys finder circuit

    icic, thx for the information, i hope it work perpectly after getting the transducer
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    Keys finder circuit

    thx,what the different between piezo buzzer and piezo transducer? and also whats the different between selfdrive (3 terminal) and external drive (2 terminal) which one am i suppose to use?
  19. L

    Keys finder circuit

    after i connected it to a battery, the buzzer started trigger, wheter i whistle or other sound, nothing is change. is it i use the wrong buzzer? how to make sure i get the correct buzzer?
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