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Topic: sine wave generator (Read 4 times) previous topic - next topic

robtillaart

@aphy
Can you explain why you want to penetrate wood ?
Rob Tillaart

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(Please do not PM for private consultancy)

aphy

can 555 create nice 40 kHz sine wave? do you have any schematic? thanks

AWOL

#17
Jun 22, 2011, 03:29 pm Last Edit: Jun 22, 2011, 03:35 pm by AWOL Reason: 1
No, a 555 can't generate a nice sine wave at 40kHz, but it has been repeatedly pointed out to you that you don't need a 40kHz sine wave when a 40kHz square wave will do the job just as well.
A 555 will produce a 40kHz square wave.

I just guessing here, but one of us first picked up a pair of Murata 40kHz transducers about thirty years ago and happily drove it with a 555, then an 8080, a Z80, a 6809, a 68000, a PIC and then an Arduino, and one of us didn't.

(Edit: oops missed out T450 transputer)
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

aphy

ok thank you very much!!! :D

i will try the square wave and the 555 as well.
sorry i'm just afraid to try the square wave because i'm afraid to break my sensor.

but then i guess I'll do it. thanks..

Grumpy_Mike

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i'm just afraid to try the square wave because i'm afraid to break my sensor.

But the data sheet specifies square waves.

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but one of us first picked up a pair of Murata 40kHz transducers about thirty years ago

Make that two of us  :)

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