On 6/30/11 9:30 PM, Wayne de Geere III wrote:
You must be a real phone fan to know that proper ring generation is at 20Hz,
I'm impressed!
On 2011 Jun 30, at 20:34 , David Forbes wrote:
I used to own an HP 201B audio signal generator. It was powerful enough to ring
a telephone bell, providing 100V RMS at 20 Hz.
Yes, I am. I have an analog PBX in my house.
I was building a cordless Western Electric 2500 desk set, so I needed to
ring the original bell with a 3.6V battery pack. I ended up rewinding
the coil for lower voltage and using a 555 timer oscillator feeding an
H-bridge driver to make it ring. It sounded exactly like the real thing.
--
David Forbes, Tucson AZ
--
You received this message because you are subscribed to the Google Groups
"neonixie-l" group.
To post to this group, send an email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/neonixie-l?hl=en-GB.
