Looking a 20HZ AC oscilator circuit

Thread Starter

A A (Caterga)

Joined Sep 16, 2018
2
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?
 

Thread Starter

A A (Caterga)

Joined Sep 16, 2018
2
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.
 

AlbertHall

Joined Jun 4, 2014
10,372
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?
 
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