how can people post things this stupid?

I wish everyone would calm down. It's not a real amplifier. No one is saying "build this". It is only a construction to allow some parameters to be calculated as basic practice. All those knickers in a twist ...

That was my take too. Too many folks with a superiority complex.

The difficulty is the precision required. 70 nm precision on a 25-mm diameter gear equates to over a million encoder lines per rev.

Cheers

Phil Hobbs

I guess I'm a little surprised a worm gear can do better open loop, backlash and all, than an encoder.

You control backlash with a preload, and by scanning in only one direction. It's the repeatability that's the issue in this case, rather than the absolute tuning accuracy.

Cheers

Phil Hobbs

Does not seem to be a whole number?

Was 25mm a ball park figure?

Jamie

Got your train license now?

Jamie

You're kidding, right?

Cheers

Phil Hobbs

Nah, just putting the post title in application...

What ever you say.

Jamie

I don't see much wrong with it except they didn't specify the amplitude of the input (Vin). If suppose the input swing was -0.7 to +20.7, and the freq uency was high enough not to cause a drop on the caps, the output should mo ve between 0 to +20 with a peak power output of 10^2/8 = 12.5 watts or 6.

-Bill

There's thermal runaway. And 2 watts dissipated in the resistors. And they blew the impedance calculation.

I am not sure if your post should be accepted for its face value or is this just a parody.

While a complementary emitter follower could be driven with voltages outside the 0..20 V voltage range (requiring a separate power supply outside that range on both sides), you still had to consider the VceSat losses (about 0.5 to 1.0 V) compared to the 0.7 .. 1.5 Vbe losses.

Even with VceSat of only 0.5 V, the voltage swing would be 0.5 to 19.5 V and thus the voltage swing +/-9.5 Vp or 11.3 W. The actual loudness difference (expressed in dB) would be miniscule .

awful

electronic

bookshelf, or

circuit

Sure they want to get whatever the latest sales critter just snowed them with. It doesn't even have to be useful in the real application.

For the big paycheck. Engineers, even incompetent ones can make good money so long as there is enough decent engineers in the organization (and properly placed) to save them from themselves.

P.S. welcome to my world.

awful

electronic

bookshelf, or

analog circuit

an

stand

MoS2.

to

Crickey, are you telling me that the gear train is not biased with a spring or some means to reduce slop? Standard technique in servoland. (Actually we slightly misalign the high ratio synchro to get the drive train pushed to one side.)

?-)

Of course it's preloaded, and so are the bearings. Getting slop down below 70 nm under sliding friction is a bit of a parlour trick even so. Just the grease working its way out of the the interface is more than we can stand.

I told the engineers to use a sine bar rather than a worm gear, but since I didn't have executive authority, they didn't do it.

The sine bar could have been longer, and the screw could have had many more turns than the worm gear has teeth. They could both have been made from Invar, as well.

Cheers

Phil Hobbs

At 2 microns? Nothing whatsoever.

Cheers

Phil Hobbs

to an awful

competant electronic

bookshelf, or

analog circuit

At an

been

the

stand

MoS2.

Is

turn

keeps

that

Johnson

noise

this

hope

they

for

had it,

suck

That gets me to wondering what could be done with an LED laser shot through the grating to a carefully positioned high megapixels camera chip.

?-)