Digest for sci.electronics.repair@googlegroups.com - 5 updates in 3 topics

ggherold@gmail.com: Aug 15 09:08AM -0700

On Saturday, August 12, 2017 at 8:24:10 AM UTC-4, Samuel M. Goldwasser wrote:
> down during the quick test. :)
 
> And, in the interest of science, I have just purchased a 12 W charger
> from the Apple store to compare. ;-)
 
If it's just a 5V supply you could buy a Phihong wall wart for ~$15.
You'd have to re-wire the plug. How much is the charger from the apple
store? (If you don't mind my asking.)
 
George H.
bob prohaska <bp@www.zefox.net>: Aug 14 07:27PM

> instead of diodes. Their gates are controlled (via the G1 and G2
> terminals) to switch on for a variable portion of a cycle thus varying
> the power transferred.
 
Ok, now the fog is lifting, slightly 8-)
 
Many thanks for reading and replying!
 
bob prohaska
 
 
John Robertson <spam@flippers.com>: Aug 14 05:22PM -0700

On 2017/08/14 1:39 AM, Geo wrote:
> technique to reduce the input to the linear regulator when then output
> voltage was dialled low and the 5 Amps would have resulted in too high
> a dissipation in the regulator transistors.
 
An early 70s (?) local Canadian electronics catalogue (R.A.E. Industrial
Electronics) has some of these SCR/Bridge rectifiers listed on pg. 138 -
made by IR. See if you can find anything on the PACE/paks design. Happy
to email the two pages showing the IR versions...these devices with 6
terminals have up to six different internal configurations.
 
1-Single Phase hybrid bridge with common cathode connection
2-Single Phase hybrid bridge with common anode connection
3-Single Phase, all SCR, controlled bridge (8 terminals)
4-Single Phase hybrid bridge with doubler connection
5-Single Phase, all SCR, AC Switch. (anti-parallel controller) (4 or 6
terminals)
6-Single Phase, hybrid AC Switch. (anti-parallel connector) (5 terminals)
 
John :-#)#
bob prohaska <bp@www.zefox.net>: Aug 15 03:37PM

> 5-Single Phase, all SCR, AC Switch. (anti-parallel controller) (4 or 6
> terminals)
> 6-Single Phase, hybrid AC Switch. (anti-parallel connector) (5 terminals)
 
PACE/pak turned out to be the keyword needed. That found
http://www.vishay.com/docs/93754/vs-p100series.pdf
which is plausibly the modern device series. most likely
the single phase hybrid bridge common cathode version.
 
Now, if only somebody could give a similar hint about the board.....
With no numbers visible I know that's a long shot.
 
Fortunately, no parts are needed now, I just want to understand
what I'm dealing with before redoing the external wiring.
 
With thanks,
 
bob prohaska
John Robertson <spam@flippers.com>: Aug 14 10:34AM -0700

On 2017/08/14 12:53 AM, N_Cook wrote:
>> http://www.nhc.noaa.gov/graphics_at3.shtml?cone#contents
>> how often does a 74 to 110mph system get beyond 40 degrees north?
 
> wrong bit of usenet
 
43.63N,79.38W (close enough?)
 
Not to mention that in 1954 Toronto had a hurricane visit...I was a wee
lad at the time, but I recall the stories told afterwards.
 
https://en.wikipedia.org/wiki/Effects_of_Hurricane_Hazel_in_Canada
 
It seems that not long before hurricane Hazel dropped by the city
fathers were developing the cities ravines, considering that they didn't
seem to have any real use. After Hazel they were left to act as they
always were supposed to act - flood funnels down to lake Ontario!
 
John :-#(#
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