JD Ryder Short Bio
John D Ryder
Dean of Engineering and
Professor of Electrical Engineering
Michigan State University
The text book I pulled the info from was published in 1957. Many of us going thru the system used his book along with Terman & Pettit.
Based on this bio I think he knew a bit more about electronics than most of us on this forum.
John D Ryder
Dean of Engineering and
Professor of Electrical Engineering
Michigan State University
The text book I pulled the info from was published in 1957. Many of us going thru the system used his book along with Terman & Pettit.
Based on this bio I think he knew a bit more about electronics than most of us on this forum.
I designed & built power supplies for magnetrons, klystrons, photo tubes & on & on. All that left behind when I joined HP sales in 1965. Only a couple of photos, this one for a magnetron, it is constant current & manages 1.6 KV at 0.25A. Many general purpose PS for the lab as well. And a 4.5KV, One amp brute, regulated. The rectifiers where a full bridge of 7136 Hgs, a tad larger than 866s. It powered a continuous wave cooking magnetron that powered a gas discharge in a glass vessel. Part of an experiment, I worked in the Physics graduate lab at U of T on the way to the P,Eng.
I might know something about power supplies.
I might know something about power supplies.
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jhstewart9,
OK, so MR. JD Ryder was absolutely correct.
Lets try this example:
60Hz (in 1957, 60 Cycles).
Mercury Vapor Rectifier current 1/2 Amp.
Stray capacitance of the ends of the B+ secondary to ground, 1000pF (in 1957 1000 micro micro Farad).
Capacitive Reactance, 60Hz, 1000pF = 2.652 Meg Ohm.
1/2 Secondary voltage = 500V, 707V Peak
Capacitive current 707V / 2.652 Meg Ohm = 267uA.
Compare 267uA at 60Hz (60 Cycles) versus 1/2 A of 120 Unidirectional alternations.
The parasitic 60Hz (60 Cycles) current is 1/1876 of the 1/2A 120 Unidirectional Alternation current.
Yes, it may be a problem, but not so much for this example.
A 1876 Layer Onion.
The 1/2A is the outer layer of the Onion.
The 267uA parasitic current is the central most layer of the Onion.
Let us peel the layers of the Onion.
I would rather slice the Onion, and cook up an English Pot Roast.
OK, so MR. JD Ryder was absolutely correct.
Lets try this example:
60Hz (in 1957, 60 Cycles).
Mercury Vapor Rectifier current 1/2 Amp.
Stray capacitance of the ends of the B+ secondary to ground, 1000pF (in 1957 1000 micro micro Farad).
Capacitive Reactance, 60Hz, 1000pF = 2.652 Meg Ohm.
1/2 Secondary voltage = 500V, 707V Peak
Capacitive current 707V / 2.652 Meg Ohm = 267uA.
Compare 267uA at 60Hz (60 Cycles) versus 1/2 A of 120 Unidirectional alternations.
The parasitic 60Hz (60 Cycles) current is 1/1876 of the 1/2A 120 Unidirectional Alternation current.
Yes, it may be a problem, but not so much for this example.
A 1876 Layer Onion.
The 1/2A is the outer layer of the Onion.
The 267uA parasitic current is the central most layer of the Onion.
Let us peel the layers of the Onion.
I would rather slice the Onion, and cook up an English Pot Roast.
Last edited:
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