What is the frequency? Breadboards normally do not deal very well with
higher frequencies.


-----Mensagem original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] Em nome de John
Waters
Enviada em: sexta-feira, 26 de maio de 2006 01:02
Para: piclist@mit.edu
Assunto: [EE]: Strange interference to my simple oscillator circuit

Hi All,

I encountered some strange problems when was doing experiments on a simple
oscillator circuit. I built a circuit that was made up by the 4 COMS NOR
gates in a CD4001. I used the first 2 NOR gates to build a simple monostable
that turned on or off a low frequency oscillator made up by the 3rd and 4th
NOR gates. The circuit was built on a breadboard, running on 6V batteries. I
found the following strange things happened and could not explain why:-

1. when I turned on my computer nearby, the frequency of the oscillator
changed (slightly though). When I turned off the PC, the frequency went back
to normal.

2. I triggered the monostable manually so that the output went to the ON
state, but when I switched the light in the room off, at that particular
moment, the monostable went back to normal state automatically.

It was obvious that my simple circuit was interfered, but I was using
battery as the power source, there was no way the mains spikes could go to
my circuit! Could somebody give an explaination and suggest how to make my
circuit not susceptible to the interference?

Thanks in advanced!

John


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