Edit: Please disregard this question, I wrote it last night when I was apparently very tired and not thinking clearly. There's a lot wrong with how I was thinking about it, including that I don't have a DC power supply capable of giving me 127V peak (which I'd need for a 90V RMS sine wave). I'll look more into the suggestions on the site that I linked to.

Hi all,

Given a DC benchtop power supply, a function generator, and some transistors (or other components), would it be possible to create an AC power supply for the purpose of ringing a telephone (90V at 20 Hz RMS with about 1k resistance)? Or if I'm thinking about this completely wrong, is there a better solution? I've looked at this site: http://www.epanorama.net/circuits/telephone_ringer.html but the suggestions all fall into the categories of either 1) using mains, through a transformer, which would give a 60 Hz signal (still acceptable for ringing a phone, but I'd like to use the standard 20 Hz frequency), or 2) using components I don't quite understand or have on hand, like a PA amplifier or multivibrator. I was imagining this working with a sine wave being amplified by some BJT's, but given that the site I linked to didn't suggest something so simple, I imagine that I'm imagining it wrong

Thanks for any help you can give.

 

Is this telephone connected to a telephone network, or independent of any network?

 

Is this telephone connected to a telephone network, or independent of any network?

Independent, my goal is to create an internal home PBX and eventually connect it to Google Voice, but it will never be connected to POTS.

 

Please disregard this question, I wrote it last night when I was apparently very tired and not thinking clearly. There's a lot wrong with how I was thinking about it, including that I don't have a DC power supply capable of giving me 127V peak (which I'd need for 90V RMS). I'll look more into the suggestions on the site that I linked to.

 

If the bell is the old-fashioned electromechanical type I doubt it would be too fussy about being supplied with a sine wave. A 90V square wave might be easier to generate.

 

If the bell is the old-fashioned electromechanical type I doubt it would be too fussy about being supplied with a sine wave. A 90V square wave might be easier to generate.

I was curious about whether a square wave would do and suspected it might but couldn't find anything, thanks!