Looking for low power low voltage Astable circuit or 2-4 hz frequency

[ehsan_r34]

Hello.
Please give me a low power low voltage Astable circuit or 2-4 hz frequency.
Thanks

 

[A.Anand Srinivasan]

Re: Astable circuit

try using a 555 IC... it is very stable circuitry for low voltage as well as low frequency requirements that you have.....

 

[ehsan_r34]

Re: Astable circuit

Thanks
But it work at 5volt.
I want to work at 3volt.:?:

 

[A.Anand Srinivasan]

Re: Astable circuit

then use the circuit using two transistors.... it will surely work for 3V and less... these circuits are even available in market pre fabricated in a PCB....

 

[max0412]

Re: Astable circuit

But it work at 5volt.
I want to work at 3volt.

The CMOS tlc555 timer works from 2V to 15V.

http://www.ti.com/lit/gpn/tlc555

Also in SMD and dual TLC556.

 

[ehsan_r34]

Astable circuit

Thanks
I need very low power and reliable Astable circuit for driving LED with 15-20mA.
Do u think 555 do it?

 

[A.Anand Srinivasan]

Re: Astable circuit

the 555 IC can sink a current of about 15mA..... the circuit i told you of can drive 2 LEDs at a time.... i bought a readymade module of it which uses 3V to do so.....

 

[ehsan_r34]

Astable circuit

How dose it drive the LEDs.

 

[A.Anand Srinivasan]

Re: Astable circuit

it has two LEDs connected across its output in parallel......

 

[Sadegh.j]

Re: Astable circuit

Check Rashid or Bell

 

[max0412]

Re: Astable circuit

You could use either device ,I just pointed out the TLC555 can work down to 2V.

To answer your question you could hook two LED's up in parallel from the Vcc rail to the output cathode to the output of the TLC555 timer with current limiting resistors.The TLC555 can sink up to 100mA (sources 10mA). The LED's will just go on when the outputs low and off when its high.

Here is what is meant by sink, source current,and how to hook your LED 's up.About 1/4 way down the page.

http://www.kpsec.freeuk.com/components/ic.htm