A budget chargers all utilize a "ringing choke converter" circuit, which coincidentally is similar electrical power provide topology employed by the Apple II.
If you need to know what precisely each capacitor and transistor in an influence supply does, examine this post.
Thank you for a radical and insightful tests effort and compose up. I would be interested to check out a wider variety of chargers tested, as makers (even the good types) seem to provide tiny information on their products over and above nominal enter and output figures.
This can be the AA11040-B power offer for your Apple II In addition. AC electricity enters, over the remaining, is filtered, goes from the massive switching transistor into the flyback transformer in the middle, is rectified via the diodes to the proper (on heatsinks), after which you can is filtered by the capacitors on the correct. The Command circuitry is along the bottom. Photo employed by authorization from kjfloop, Copyright 2007.
The moment electricity transistors could handle a huge selection of volts, ability provides could reduce the weighty sixty Hz power transformer and operate "off-line" straight from line voltage. A lot quicker transistor switching speeds allowed much more successful and much smaller energy supplies.
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The ripple is Evidently seen as the waves during the yellow trace about the left and as the spikes (at one hundred twenty Hz and 240 Hz) within the orange trace on the appropriate.
Also checking out the oscilloscope traces I believe that not simply was this examined only for 230V but additionally only at 50Hz.
I'm thinking of just utilizing the +5V and Gnd being linked to the usb normal A port. So, for a few queries:
Switching power provides also turned popular products and solutions for electrical power offer companies setting up inside the late sixties.
It contained 7 H7420 electric power supplies and about 33 individual switching regulator models, in addition to a linear regulator for the CPU that utilised -12V DC at 490A.
One puzzling facet of power source dialogue inside the book Steve Positions[one] could be the statement which the Apple II's energy provide is "like All those used in oscilloscopes", given that oscilloscopes are just one particular little use for switching electricity supplies.
Thank you with the intriguing and nicely researched short article. It introduced back again a lot of Reminiscences from your early times with the Computer revolution. Offered the history, the subsequent assertion would seem a tiny bit harsh:
The sole one I've found that will charge two iPads (or an apple iphone and an iPad) at the same time. Be curious how they amount as part of your assessments.