Re: Alarm system transformer + power supply (would both go bad atonce?)

[The Daring Dufas <the-daring-dufas@xxxxxxxxxxxxxxxxx>]

On 12/5/2013 6:03 AM, Michael A. Terrell wrote:
>
> The Daring Dufas wrote:
>>
>> Back in the 70's I made my own circuit boards on the kitchen table so I
>> could build my own solid state alarm controls. Most of what was around
>> was the old reverse polarity on a pair going directly to a central
>> station like the police/fire department. ^_^
>
>
>
>    That depended on the type of equipment at the local CO. Touch Tone
> phones had to be modified to work with the 1920s designed CO equipment
> in my home town before the DTMF to pulse converter would work.  They
> really went whole hog in their conversion. Only 100 DTMF lines were made
> available, out of 30,000 numbers.
>
>     We looked into manufacturing some alarm equipment, but the
> manufacture's liability insurance was over $1,000,000 a year at that
> time.
>
>

Well heck, what can I say, I grew up in Alabamastan. The most advanced
thing to come out of my province was this little space program thingy. ^_^

TDD