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    Square wave generation without Microcontroller

    Hello, I need a circuit that when a push button is pressed then below square wave is generated four times. Do you have any idea to generate it without using microcontroller and as simple as possible?

    Click image for larger version. 

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    Re: Square wave generation without Microcontroller

    Two halves of a multivibrator IC, switch enables monostable
    pulse, monostable pulse gates astable oscillator. Couple of
    R, C elements plus IC.



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    Re: Square wave generation without Microcontroller

    Quote Originally Posted by dick_freebird View Post
    Two halves of a multivibrator IC, switch enables monostable
    pulse, monostable pulse gates astable oscillator. Couple of
    R, C elements plus IC.
    Can you please draw it in a schematic!?



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    Re: Square wave generation without Microcontroller

    Hi,

    Why no microcontroller? It is the simplest.

    Use a PLD.

    Klaus
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    Re: Square wave generation without Microcontroller

    Quote Originally Posted by KlausST View Post
    Hi,

    Why no microcontroller? It is the simplest.

    Use a PLD.

    Klaus
    Because I need to implement it as cheap as possible!! and also it should be low power because it must used with battery. How much is power consumption of PLDs and how can i program it?



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    Re: Square wave generation without Microcontroller

    I could generate that with 1% timing accuracy in two components for 0.5 Euro using a PIC 10F200 micro. Current consumption less than 0.5uA when idle and about (200uA+load current) while sending the waveform.

    Brian.
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    Re: Square wave generation without Microcontroller

    Pulse generator made from 2 invert-gates, capacitor and resistor.

    Click image for larger version. 

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    You can send its output through a diode to control a second pulse generator (adjusted for a faster frequency), turning its operation on and off.

    To create a one-time startup delay, experiment with various diode-resistor-capacitor networks. Feed its output to control the first (slowest) pulse generator. With careful adjustment of RC values, you can create a time delay that allows 4 beeps, then halts.

    - - - Updated - - -

    You get six invert-gates in a 4049 or 4069 cmos IC.



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    Re: Square wave generation without Microcontroller

    Hi,

    I'm with brian.
    Take component count, components cost, assembling cost, stock cost, ordering cost, PCB cost ... into account.
    With microcontrollers you are most flexible to generate any pulse timings with good precision...

    Klaus
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    Re: Square wave generation without Microcontroller

    To generate that pulse train four times for each button press would require two multivibrators and a 2-bit counter.
    A mico would be a lot simpler and cheaper.
    Zapper
    Curmudgeon Elektroniker



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    Re: Square wave generation without Microcontroller

    Sure it can be done without ICs but do you have the time and patience to assemble all this? It wont be cheaper for sure.
    This is only half the requirements; still need the 2 transistors latch on button and a 'one shot' monostable circuit.



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    Re: Square wave generation without Microcontroller

    See TimerBlox tools from Linear.
    https://www.analog.com/en/products/c...timerblox.html

    they are very good simple pulse generators,square wave generators etc.
    LT6990/1/2



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    Re: Square wave generation without Microcontroller

    It still comes down to needing at least three timers/counters:
    1. the pulse frequency
    2. the burst rate
    3. the four bursts

    All are simple in software but require individual timers if done in hardware.

    Brian.
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    Re: Square wave generation without Microcontroller

    This reminds me the UM3750 or MM53200 chip.

    But you can't beat the MCU on flexibility and current consumption.

    Go for it with your choice of MCU.

    Ioannis



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