More New Toys!

[Joe R.]

At 10:35 PM 2/25/05 -0500, you wrote:
>basically to get the constant voltage output even when the AC supply goes 
>from 90 to 120. A normal transformer will "follow" the line voltage. The 
>power supply board uses schottky diodes and the transformer puts out just 
>enough voltage to be regulated to five volts with minimal power loss (there 
>are a couple of other secondary windings for + and - 12 for RS232). With a 
>normal transformer, the power supply design would have to been different to 
>deal with the higher wattage that it would have had to dissipate. 

  I understand all that but AC power is cheap and so is a fan to dissapate
the excess heat. It's surprising to see a company spent money for features
like this unless there is a very real requirement for them. Even HP doesn't
go to this length with their power supplies.

The 
>transformer was custom wound for AMC.

   And expensive I'll bet!

>
>By the way, the EM189 was a 6809 emulator...

  Oops. I guess it was late and I was tired. I had it setting right in
front of me and I still got it wrong. I should have said EM-180B.  I'd sure
like to find a pod for it but it doesn't look likely.   BTW I'm assuming
that the transformers for the various models all put out the same voltage.
Is that true?

    Joe

>
>
>the resonant tran
>At 10:09 PM 02/25/2005, you wrote:
>>   Thanks for the info Steve. I have a EM-189 (Z-80) that's missing the pod
>>so I guess I can rob the x-former out of it.
>>
>>    I'm curious, why did they use a resonant transformer?
>>
>>     Joe
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