need help explaining this circuit!

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legolaslee said:
Hmm. What about the NAND gates? What does it do?
Click to expand...

The bottom section of the 4093 inverts the pulses from the pulse generator so that the transistors are driven by th opposite phases of the pulse, compared to the top transistors,,,push pull,
 
Hmm. Whats the meaning of transistors driven by the opposite phases of the pulse?
IC3/2 and IC/3 are used to generate a pulse?
 
legolaslee said:
Hmm. Whats the meaning of transistors driven by the opposite phases of the pulse?
IC3/2 and IC/3 are used to generate a pulse?
Click to expand...

The ultrasonic transducer requires a push pull drive for maximum output.

The transistors are switched so that the pulse voltage across the transducer is is applied one way then reversed.

Note: the transistors are npn and pnp.
 
Look at these twi gif's

Showing the pulse state as High in Red and Low in Green.
 

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The ultrasonic transducer requires a push pull drive for maximum output
Click to expand...

hi Nigel,
I did try to explain the push/pull, I think he finally understood.
 
The CD4093 Nand gates IC is a Schmitt-trigger type.
But the Cmos oscillator should use an ordinary CD4011 Nand gates IC.
 
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