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Oscillator with frequency =0.1Hz

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WinterInJuly

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Hi everyone!
I want to design an oscillator circuit which has the frequency about 0.1Hz (T=10S) using L, R, C, Transistor (passive components) to reduce power consumption. Please help me!
Thanks
 

The simplest circuit will have at least 2 transistors.
Below is an example with easy adjustable frequency: use 10kΩ resistor instead of LED and output is at emitter of the pnp transistor.
Also, consider low power version of 555 generator..
Regards,
IanP
 

That's great!
Thanks Ian
Regards,
Hieu

Added after 11 minutes:

In this circuit, how to calculate the duty cycle?
 

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