Hz overload
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Posted by steve on June 26, 2008, 10:38 am
Please log in for more thread options Since the 9v battery supply is quickly used up, I am using a ac battery eliminator/wall wart to run the Led timer. Although the eliminator provides the needed 12v to 15 v, it also changes the 50 hz dramatically to several khz. The khz output from the eliminator completely upsets the 555 timer input, so there is no timing available from with the circuit. I tried a 1000uF with several diodes placed at the eliminator=92s output, but there is hardly any production of dc. Thanks. Steve. | |||||||||||||||||||||||||||||||
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Posted by Tom Biasi on June 26, 2008, 10:56 am
Please log in for more thread options Since the 9v battery supply is quickly used up, I am using a ac battery eliminator/wall wart to run the Led timer. Although the eliminator provides the needed 12v to 15 v, it also changes the 50 hz dramatically to several khz. The khz output from the eliminator completely upsets the 555 timer input, so there is no timing available from with the circuit. I tried a 1000uF with several diodes placed at the eliminator’s output, but there is hardly any production of dc. Thanks. Steve. Sounds like you are using a switching supply. The wall wart is not filtered very well. Also your project didn't address noise on the DC supply. I would suggest non-switching wall wart and clean up the output. I would also look into your design since it wasn't expecting noise from a battery. Tom | |||||||||||||||||||||||||||||||
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Posted by steve on June 29, 2008, 10:15 am
Please log in for more thread options ----------------------------------------------------------------- This project was difficult to design, so preferably it should be kept same. I will provide the schematic shortly. Steve. | |||||||||||||||||||||||||||||||
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Posted by Tom Biasi on June 29, 2008, 11:18 am
Please log in for more thread options
----------------------------------------------------------------- This project was difficult to design, so preferably it should be kept same. I will provide the schematic shortly. Steve. If its too much trouble for you to fix your design then the only other choice is to supply it with clean DC. Tom | |||||||||||||||||||||||||||||||
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Posted by steve on July 2, 2008, 10:11 am
Please log in for more thread options >
.
> > > > > >
> > Since the 9v battery supply is quickly used up, I am using a ac
> > battery eliminator/wall wart to run the Led timer. >
> > Although the eliminator provides the needed 12v to 15 v, it also
> > changes the 50 hz dramatically to several khz. >
> > The khz output from the eliminator completely upsets the 555 timer
> > input, so there is no timing available from with the circuit. >
> > I tried a 1000uF with several diodes placed at the eliminator=92s
> > output, but there is hardly any production of dc. >
> > Thanks.
>
> > Steve.
>
> > Sounds like you are using a switching supply.
a
> > The wall wart is not filtered very well. > > Also your project didn't address noise on the DC supply. > > I would suggest non-switching wall wart and clean up the output. > > I would also look into your design since it wasn't expecting noise from= > > battery.
>
> > Tom
>
-----------------------------------------------------------------
> ----------------------------------------------------------------- > This project was difficult to design, so preferably it should be kept > same. > > I will provide the schematic shortly. > > Steve.- Hide quoted text - > > - Show quoted text - ------------------------------------------------ 9 v | | | | R1 | | | 1Meg | 555 | R2 | | | 100K | | |-------------| | | |---------------------- Out |--------------|----------- | | | | | | | Led or | 1 uF Buzzer 100uF | | | |--------------------| Unfortunately, Google does not allow image upload here. This is a 555 timer simple circuit, consisting of: R1 =3D 1Meg R2 =3D 100K C1 =3D 100 uF C2 =3D 1 uF The problem is that replacing the led with a musical buzzer quickly uses up the 9 v battery. Therefore, I am using a ac battery eliminator/wall wart to run the Led timer. Although the eliminator provides the needed 12v to 15 v, it also changes the 50 hz dramatically to several khz. The khz output from the eliminator completely upsets the 555 timer input, so there is no timing available from with the circuit. I tried a 1000uF with several diodes placed at the eliminator=92s output, but there is hardly any production of dc. | |||||||||||||||||||||||||||||||
| Similar Threads | Posted |
| Hz overload | June 26, 2008, 10:38 am |
| battery charger circuit overload | September 26, 2008, 9:26 am |
>
> Since the 9v battery supply is quickly used up, I am using a ac
> battery eliminator/wall wart to run the Led timer.
>
> Although the eliminator provides the needed 12v to 15 v, it also
> changes the 50 hz dramatically to several khz.
>
> The khz output from the eliminator completely upsets the 555 timer
> input, so there is no timing available from with the circuit.
>
> I tried a 1000uF with several diodes placed at the eliminator=92s
> output, but there is hardly any production of dc.
>
> Thanks.
>
> Steve.
>
> Sounds like you are using a switching supply.
> The wall wart is not filtered very well.
> Also your project didn't address noise on the DC supply.
> I would suggest non-switching wall wart and clean up the output.
> I would also look into your design since it wasn't expecting noise from a
> battery.
>
> Tom