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Posts posted by logan_dslasher
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oh no!! i was just about to say that this is more like a anything-that-moves alarm than a whistle responder...
This circuit has a very high gain. It should be on a pcb with very short wires to avoid picking-up mains hum. How did you change R1's value in a cafe unless they allow you to solder there?
I hope you don't have the circuit on a breadboard. Intermittent contacts on a breadbord would cause the mic's voltage to change all over the place. The long connecting wires in the entire circuit would pick-up mains hum.
YES. i still have them on a breadboard :( and the tallest component is almost an inch long..
when i try to check its connection and slightly bump to its components, it beeps!!! should i cut the wires? do i have to solder it in a PCB (which will have to wait until tomorrow)? -
the mic's volatge went up by 2V, now it's 2.2V..
but why did it stopped beeping? the noise is still present.. even before i changed r1's value, it stopped.. no matter what sound i try to produce, it remains quiet.. the only way i can make it beep, except measuruing pin5, is by disconnecting-reconnecting it to the supply. the moment i reconnect the alligator clips, it beeps.. then remains quiet.. :'( -
alright then, i'll change R1's value.. i'll let you know what will happen, and what would be the mics voltage..
hey! it suddenly became quiet! ??? -
i can say that it was certainly a good choice! i have already spent so much time on the whistle responder that i am more familiar with it than with the key finder...
besides, i don't know what piezo speaker to use for its circuit. how will i know if the speaker can be used as a microphone? -
Much too low. What resistor value do you have to connect it to 3V?
R1 - 22K
i think it's very sensitive. is there a way to lessen its sensitivity.. i think i remembered something about changing the value of R4 to change its sensitivity? this is not a whistle responder, it's a noise responder!! ehehe.. but i'm really glad it's working..
by the way, i have it wired like when u first modified it -- with 4.7K to its pin15 and transistors base... -
"Problem loading page"
"the connection has timed out"
GREAT!! just when i finally got my project to work!! -
auidoguru! audioguru!! it's beeping!!! i don't want to touch it cause it might not beep again... from time to time, it beeps!! it's so noisy here in the internet cafe so i dont' really know what is triggering it! gamiing sounds like explosions and special FX.. there's also a music being played... what should i do now?!! HEELLPPP!!!
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because this circuit requires a piezo speaker, i decided to go back making the whistle responder circuit. i believe that the whistle responder is better because it has its own microphone unlike with the key finder circuit where the ear and mouth of the circuit is its piezo speaker.. -
i was surprised audioguru mailed me.. it was really nice of him to do that! thanks for the help?
what was wrong with The e-Lab anyway? i'm glad it was fixed already.. this is my only source in making my thesis... ;D
tahnks a lot.. -
i am working again on the whisatle responder circuit to be used in my thesis. i have finally convinced my adviser that this is a better one compared to the key finder.
we have tested the circuit this afternoon and he concluded that my IC is damaged. i have replaced it already and guess what? it beeped. only two beeps. it beeped so fat that i think it didn't took a asecond for those two quick beeps. i don;t exactly know what made it beeped.. i tried making all sorts of sounds in hopes of making it beep again but to no avail..
i tested its test points (reply#28) my test results matched them except for the mic voltage which is 0.2V (nearly 0V).. when i tested pin5.. it made short beeps until i removed the test lead on it. what does that mean? athat's the first time that happend.. the transistor's base has 0V..
i have the projct with me.. please tell me what to do with it.. i'll wait.. thanks.. -
ow, one more thing.. mylar capacitor codes are read just like in a ceramic, right? the first two digits as their values and the third one as the multiplier.. then its unit is in pF.. is that right? are there other wayz they are read? -
1) "If the transistor has the 4.7k resistor in series with it like in my 1st modification of the original circuit, then you can test the transistor by shorting its base to ground to turn it off."
the buzzer continued beeping.
2) "Your mic is working properly now so maybe it is picking up the sound of the beeper which I think will keep the circuit turned on. Short the mic to ground for a minute to see if the beeper stops."
even for two minutes, it didn't stop.
3) "With R10 as 1.5M and C5 as 47nF as in the project's parts list then pin 10 of the IC should oscillate at about 8.5 beeps per second which maybe is too fast for your beeper to turn off beween pulses. Try 330nF or 470nF for C5 to slow it to about 1 beep per second."
sorry i havent done that.. -
Your piezo speaker didn't work in the other project that was modified for it so maybe it will have the same problem in this project. Get another piezo speaker that works.
where could i get a piezo speaker? let's say i can't buy one on an electronic shop because it is not available... how about the buzzer/speaker from the melody circuit of a Christmas light? or ma ybe the one from those greeting cards that plays a song as son as you open it? are those speakers or buzzers? how could i test if it is working? will a piezo speaker beep (like a buzzer) when i test it with an ohmeter?
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what is exactly the reason why the buzzer kept beeping as soon as power is suppl ied? how could i solve that? -
i am starting to put hte parts on the breadboard..
about the buzzer.. it's supposed to be a piezo speaker right? so the one i had from the alarm clock would be fine? why can't i use the piezo buzzer? -
i already completed the parts except for the tantalum capacitor.. an electrolytic would be fine? OK, i'll use an electrolytic instead.. the same with the transistors.. i found a 2SC3622.
10V? would 9V be fine? i'm planning to use a 9V battery (the rectangular-shaped one) -
i tried working on the circuit again. guess what? the moment i turn on the power, the buzzer kept beeping.. i tried to measure the circuit's voltage.. and found out that the transistor's base has a 0.5V which should be 0V.. i think i have to replace my transistor again. i have asked a friend to buy one for me..
i am using 1M5 for R10 and 47nF for C5.. there's is also a 4.7K at the transistors base connected to pin15.. the negative terminal pf the buzzer is in the transistor's collector and its positive terminal with +V source..
i already tried it with 4.5V, it didn't work. dont worry i won't go higher than 6V. the last time i did that, my transistor got damaged.. -
i really didn't quite understand your last two posts ;D, audioguru.. but get this. i have already found a piezo buzzer!!!! it's almost the same as what you have shown.. it beeps pretty loud with 3V.. i went back to the old circuit, the original one hoping that with the right buzzer, it would work, but.... as usual, nothing.. i tried making all sorts of sound/noise using different sources.. still, nothing./ now that i have the right buzzer, what could be wrong. maybe i don't need to work on a new circuit since i have the buzzer. i just have to make it beep when it is connected to the circuit...
remember the DC voltage values i should get from different test points? they matched!! even the mic voltage (1.5-2.5V), were correct! i got a volatge of 2.3V across the mic!!
what could still be wrong?
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i wasn't the one who changed those values. those were the specifications indicated in the copy given to me by my adviser.. I am planning to make the two of them.. if one doesn't work.. i'll try the other.. i have already purchased those parts.. and also the one indicated in the lab. problem is.. i can't complete them.. these are the parts i can't acquire:
My circuit:
- r2, r5, r8, --> 10M resistor (is there really a 10M resistor? i can do combinations right?)
- c6 --> 10uF
- t1, t2 --> 2SC3622 (2SC3245) (2SC3248)
lab's circuit:
- c4 --> tantalum
- c5 --> 1n5F
can you please suggest replacements for them?
most of the capacitors i've bought were mylar capacitors... was that OK? are they really supposed to be green-caps? is 6V enough for the circuit? -
anyway, i'll still continue working on this circuit... i want to make it beep ;) not just now.. maybe after i have the new one working and i have already made my final thesis defence..
i'm sorry for causing too much trouble... :-[
waaaa!! i have already started a new topic... i'll just delete that the next time i log in.. i have to go for now.. i have a class, and i'm late again (what's new?!) -
I've been working on the whistle responder (http://www.electronics-lab.com/projects/misc/008/index.html) project for my thesis. i can't get it to work. i'm trying a new circuit with basically the same principle - the Key Finder circuit (http://www.electronics-lab.com/projects/misc/002/index.html). However, I will use different values for most parts (esp capacitors) compared to the Key finder circuit in the lab/site.
the schematic is just the same except that i'm going to use this parts/specifications..
R1 10K
R2, R5, R8 10M
R3, R4, R6, R7, R9 100K
R10 4.7K
C1 0.027/50V
C2 56p/50V
C3 15p/50V
C4, C8 0.047/50V
C5 0.56/50V
C6 10uF/25V
C7 0.1/50V
C9 0.0015/50V
D1, D2, D3, D4 1N4148
T1, T2 2SC3622 (2SC3245) (2SC3248)
IC1 4069
i know i'm going to need a lot of help from you guyz.. i'll just post my questions the first time i encountered a problem. for now, please just standby.. ;D if you like, if you have already made this circuit, and have encountered probelms, please tell them now, so that, i can be prepared.
any suggestion or advice is very much welcome!! thanks a lot!! :) -
Time's UP! :'(
i have reached the deadline.. we are told to do the other circuit for our thesis. i'm going to need your help again... should i start another topic for this in the forumor should i just use this topic?
am going to purchase the parts this afternoon..
thanks... -
can we still figure out this circuit?
if ever we really cant make this thing work, would the keys finder circuit (http://www.electronics-lab.com/projects/misc/002/index.html) be as much of a problem as this whistle responder? what do you think? should we try building the keys finder circuit? but i still say that we ought to continue with the whistle responder... it's just that i cant come up with any more guesses with what ius wrong, and especially how to fix it!!!
i need your expert advice, audioguru, thankz...
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??? ??? ???
sorry but i really didn't quite understand what those info means...
anyway, do you think there's still a chance i could pull this out! should i go to plan B? you have already seen the alternative circuit i was telling u about, would that be easier to build? assuming i can get all the parts it needed, would it be better..
after i grounded pin5, yes, it gave the expected DC voltages.. but still no beep! :(
i'll replace the mic later...
Key Finder (pinoy version)
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things like that don't work here in our country. even pizza delivery is not free!! and pizza delivery is restricted only to a few kilometers.. besides, i dont have any credit card or any means of paying it Online..