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#1
09-07-2019, 06:37 PM
 Buddhafollower Member Join Date: Jul 2017 Posts: 91
Waveform

Good day,
Please take a look at the circuit below. The most important and the main part is the core of it, the generating circuit for the waveform. The circuit uses a LM566 IC which is very hard for me to find but i want to achieve the same result with another IC. Can i use a 555 for this? Or what can i do?

This is the waveform:

Thank you,
Attached Images
 6251441K.jpg (80.8 KB, 19 views)
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#2
09-08-2019, 07:31 AM
 Ernst Silver Member Join Date: Jul 2012 Posts: 905
From the datasheet:
Quote:
 The LM566C is a general-purpose voltage controlled oscillator which may be used to generate square and triangular waves, the frequency of which is a very linear function of a control voltage.
However, it is used here to just generate a fixed low-frequency square wave. You can also do that with a 555.

Ernst.
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#3
09-08-2019, 07:09 PM
 spacecase0 Senior Member Join Date: Nov 2014 Posts: 485
the lm566 has 2 outputs, one is square and one is triangle wave,
they are using the square wave output
seems like they are using it for the fine and easy to change frequency control it offers while keeping a 50% duty cycle
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Last edited by spacecase0; 09-08-2019 at 07:12 PM.
#4
09-10-2019, 09:06 AM
 Buddhafollower Member Join Date: Jul 2017 Posts: 91
Thank you but can someone tell me how i can achieve that waveform in the video using just the 555?
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#5
09-10-2019, 11:48 AM
 Ernst Silver Member Join Date: Jul 2012 Posts: 905
What you are seeing is the interference between the 50 Hz mains (sine) and the near 50 Hz block wave. You can achieve that with the exact same circuit, just replace the 566 oscillator circuit (566, C5, C6, R5, R6, R7) with a 555 circuit of the same frequency and a near 50% duty cycle.

Ernst.
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#6
09-10-2019, 04:19 PM
 spacecase0 Senior Member Join Date: Nov 2014 Posts: 485
page 10 of the datasheet attached has the 50% duty cycle circuit with the LM555
I attach my copy of the data sheet because the new one that TI provides has many of the application circuits removed .
Attached Files
 LM555.pdf (825.5 KB, 2 views)
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#7
09-10-2019, 06:34 PM
 Buddhafollower Member Join Date: Jul 2017 Posts: 91
Thank you _/|\_
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 Tags achieve, circuit, day, result, waveform

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