Accurate Voltage on a Capacitor

If you ever build a time machine, you'll have a great circuit for 1959.

Sounds like a transconductance amp + sample and hold.

D from BC British Columbia Canada.

"A few days" ... reminds me of some Intel PMOS RAM that required 3 voltages..once programmed, power off, unplugged, they could reliably hold data for days.

I'm still thinking about brain function.. The brain stores in terms of varying levels??? Kinda cool.. Lots of people are probably assuming the brain is like a computer with

D from BC British Columbia Canada.

The way I have heard it, things are learned by the production or elimination of synapses, that alter the interconnections of neurons and that way, vary the way they trigger each other. Think old plug-board programming a la ENIAC.

Nah nah, base e. 0, 1, 2, ... 10(e) ~= 2.7182818284590 (dec). ;-)

Incidentially, Pi (base e) ~= 10.1010020200021.

Tim

-- Deep Fryer: A very philosophical monk. Website @

That's good to know, but it still doesn't explain the universal significance of the number 42.

Bob

significance

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda funny that it's 2001 though.

Tim

-- Deep Fryer: A very philosophical monk. Website @

significance

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda funny that it's 2001 though.

Tim

-- Deep Fryer: A very philosophical monk. Website @

significance

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda funny that it's 2001 though.

Tim

-- Deep Fryer: A very philosophical monk. Website @

See? That's what's wrong with dimbulb. He always comes up with

There is no such accurate voltage at a capacitor, the charge varies on capacitance and current you supply dummy. Whatsamatta with you Chinese? Can't you figure it out on your own?

ONLY A DUMBASS PUTS 00000 AFTER A DECIMAL NUMBERS, AND WORSE THAN THAT A Zero E (Exponent with no signification). Goddamn you idiots wasting natural resources, making Bogus War etc...

Hello,

How large a capacitor? That is to say, what is the effective leakage current? We have operational amplifiers with input bias currents on the order of 10^-14 amps readily available and rather inexpensive, and certain capacitors I've tested have extremely long self-discharge time constants, so that the primary errors within a week's time are capacitance variation with temperature and dielectric absorption effects. I'm wondering if your circuit provides advantages beyond that.

These days, it is quite possible to accomplish the function digitally with essentially zero droop rate; the only problems are component failure and perhaps external "noise" such as gamma rays or severe electromagnetic pulses that disrupt the circuit.

Many years ago, when the first inertial navigation systems were developed, making integrators with very low drift rate was a big deal. Now, I don't think it is, at least not at the "days" level. "Years" or "decades" may be interesting.

Others who have posted to this thread mentioned buried FET gates that can be charged and will then hold their charge for many years, but I'm not sure they count, unless there's a mechanism to actually control the charge on the gate over a continuous range accurately and at will.

Cheers, Tom

Crap you are getting really obvious, forger.

Varying levels is much more likely: neuron firing levels are adjustable.

Makes it sound obsolete...