Author Topic: What component is needed here?  (Read 4426 times)

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Offline fullyBoricua

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Re: What component is needed here?
« Reply #25 on: December 17, 2016, 10:16:41 pm »
@Tandy Thanks! I will give it a try tomorrow on a breadboard
 

Online Simon

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Re: What component is needed here?
« Reply #26 on: December 18, 2016, 08:34:20 am »
is this a self oscilating buzzer ? if not you need to give an actual signal to the buzzer.
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Offline tatus1969

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Re: What component is needed here?
« Reply #27 on: December 18, 2016, 09:10:14 am »
how about something like this?

We Are The Watt - Resistance Is Futile!
 
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Offline fullyBoricua

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Re: What component is needed here?
« Reply #28 on: December 18, 2016, 06:16:01 pm »
@Tandy, I follow the circuit you provided at http://www.learnabout-electronics.org/Oscillators/osc45.php

But sadly isn't working, the buzzer starts right away and doesn't stop, you can also feel some hiccups in the sound, so the 555 is working. Also, pressing the trigger generates a small hiccup too.... I have already checked it a dozen times... maybe I'm missing something really stupid... can you spot any error?



Thanks.-
 

Offline Zero999

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Re: What component is needed here?
« Reply #29 on: December 18, 2016, 07:58:26 pm »
@Tandy, I follow the circuit you provided at http://www.learnabout-electronics.org/Oscillators/osc45.php

But sadly isn't working, the buzzer starts right away and doesn't stop, you can also feel some hiccups in the sound, so the 555 is working. Also, pressing the trigger generates a small hiccup too.... I have already checked it a dozen times... maybe I'm missing something really stupid... can you spot any error?
Thanks.-
Although you've not posted the schematic. There doesn't seem to be a pull-up resistor or an AC coupling capacitor on the switch. The circuit I previously posted has them: C2 and R1.


With the 555 timer, the same principle applies but a diode is needed to suppress the positive voltage spike.


A monostable can be configured so it's triggered when he power is turned on.
« Last Edit: December 18, 2016, 09:00:16 pm by Hero999 »
 
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Offline fullyBoricua

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Re: What component is needed here?
« Reply #30 on: December 18, 2016, 09:33:53 pm »
Thanks again for your patience Hero.

Moments ago my mechanic told me to look on ebay for "delay circuits", so I did and buy some of these http://www.ebay.com/itm/DC-12V-Delay-relay-shield-NE555-Timer-Switch-Adjustable-Module-0-to-10-Second-/161330097657?hash=item259005edf9:g:avMAAOSwbYZXdzac and these http://www.ebay.com/itm/172160616173?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT as they will do the job nicely.

I now do believe I can make it work following your diagram, but then the problem will be quantity.

 

Offline Zero999

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Re: What component is needed here?
« Reply #31 on: December 19, 2016, 11:01:07 pm »
Thanks again for your patience Hero.

Moments ago my mechanic told me to look on ebay for "delay circuits", so I did and buy some of these http://www.ebay.com/itm/DC-12V-Delay-relay-shield-NE555-Timer-Switch-Adjustable-Module-0-to-10-Second-/161330097657?hash=item259005edf9:g:avMAAOSwbYZXdzac and these http://www.ebay.com/itm/172160616173?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT as they will do the job nicely.

I now do believe I can make it work following your diagram, but then the problem will be quantity.
The modules you've linked to look reasonable to me but there isn't much information about them. Buy one of them to see if it's suitable, before placing a lager order.
 


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