resonance scanning circuit

[Ayman]

i  have an LRC circuit i made change in frequency manually to get resonance in circuit…but when some conditions changed i make try another frequency….any body have an automatic resonance scanning circuit?

[Ashutosh Bhatt]

there is a one type of DAC available called digital potentiometer. that changes its resistance value as per given digital input. so in your LRC resonance circuit you can use this potentiometer and change its value to change frequency

[Ayman]

please if you have a circuit how can i setup digital potentiometer?

 

[Ashutosh Bhatt]

digital potentiometers are available from Analog Electronics, TI, MAXIM etc 

read datasheets and select one that you want

mostly it has 4bit or 8bit or 12 bit digital input and 2 output terminals that gives variable resistance.

so you can connect digital input with any micro controller and change resistance by changing digital input.

[Author]

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