Circuit explanation required

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adnan012

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Hi,

This is 113-kHz transducer mist maker. What is the purpose of using L1, C7 and C8?

h**ps://www.electroschematics.com/ultrasonic-mist-maker/

Best Regards!
 

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L1 is a High Frequency Choke Coil to prevent the HF Currents to flow to Supply.
C7 and C8 Capacitive Voltage/Current Divider.
 

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    adnan012

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Thanks for reply.

There is negative voltage at vout node. What is the reason for it?
The second is LTspice design file. (change extension to .asc)

Regards!
 

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There's just an AC voltage with average DC level of zero at output.

Consider that the circuit dimensioning has to be adapted to transducer impedance. I doubt that C8 of 100 nF works with any 113 kHz transducer on the market.
 

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adnan012 said:
Thanks for reply.

There is negative voltage at vout node. What is the reason for it?
The second is LTspice design file. (change extension to .asc)

Regards!
Click to expand...
Simple, it's A-Class Amplifier. Inductor acts as a Current Source, Coupling Capacitor acts as a Voltage Source.
So, Voltage Swing over Load in A-Class Amplifiers is almost 2xVdd.
Current Swing is also 2xIds(Q)

Note: 10 Ohm Resistor augment the Rise and Fall Time due to Cgsin your simulation
Attention !
 

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