Looking a 20HZ AC oscilator circuit

Discussion in 'Analog & Mixed-Signal Design' started by A A (Caterga), Sep 16, 2018 at 12:37 AM.

  1. A A (Caterga)

    Thread Starter New Member

    Sunday
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    Hello. I found a very old telephonic bell, all the internal components were stolen except for the electromagnets. I made it work using a function generator from my school and it works perfect with 20HZ or less AC, with more frecuency it stucks in one position without ringing. I didn't found any information about the kind of circuit that I need, someone has an idea about how to achieve this low frecuency?
     
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    How much voltage and current does the bell need?
    A '555 oscillator will easily do 20Hz at fair voltae and current.
    [​IMG]
     
  3. A A (Caterga)

    Thread Starter New Member

    Sunday
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    Works fine with a wide range of voltage (between 12V and 220V), unfortunately I forgot to measure current. Isn't this oscilator like a clock signal? I mean, it goes from 0 to ΔV, I need something to go from -ΔV to ΔV.
     
  4. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    The '555 maximum supply voltage is 18V and the output signal will be a couple of volts lower than whatever the supply voltage is. It can provide up to 200mA output current. You can get the -ΔV to ΔV by connecting the signal via a capacitor.

    Can you measure the resistance of the bell?
     
  5. danadak

    Well-Known Member

    Mar 10, 2018
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