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Try this one. you can adjust the "VAR1" to change on time. To further increase/decrease change capacitor (C1) value.

enter image description here

I have uploaded Proteus simulation file.

Try this one. you can adjust the "VAR1" to change on time. To further increase/decrease change capacitor (C1) value.

enter image description here

Proteus simulation file

Try this one. you can adjust the "VAR1" to change on time. To further increase/decrease change capacitor (C1) value.

enter image description here

I have uploaded Proteus simulation file.

Source Link

Try this one. you can adjust the "VAR1" to change on time. To further increase/decrease change capacitor (C1) value.

enter image description here

Proteus simulation file