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Digital Circuit Diagrams+FETs+Drivers

Started by Earl, June 22, 2007, 02:09:18 PM

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Earl

June 22, 2007, 02:09:18 PM
I decided, since there are various topics and sometimes up to many hundred replies in just one topic, to start one just for circuit diagrams, eventuall also a repository for things like FET drivers, or power FET comparisons.  Here we talk only of circuit schematics and electronic parts.

To start with, here is a circuit for digital substraction of two frequencies.  The cool thing about this circuit is that the two frequencies can approach each other and even become equal.

Regards, Earl
"It is through science that we prove, but through intuition that we discover." - H. Poincare

"Most of all, start every day asking yourself what you will do today to make the world a better place to live in."  Mark Snoswell

"As we look ahead, we have an expression in Shell, which we like to use, and that is just as the Stone Age did not end for the lack of rocks, the oil and gas age will not end for the lack oil and gas, but rather technology will move us forward." John Hofmeister, president Shell Oil Company

Earl

#1
June 22, 2007, 02:20:04 PM
Hi All,

My previous post was for a circuit to digitally subtract one frequency from a second frequency.  Why would anyone be crazy enough to do this in an attempt to seduce Nature into giving up one of her secrets?  Well, by having two perturbations at nearly the same frequency into two coils, or maybe at opposite ends of the same coil, one might be able to synthesize virtual perturbation pulses that have very narrow width.

I wrote up this idea in an auto-calculating spreadsheet that can be loaded into Excel or Open Office.

This idea could also be used if one of the frequencies was doubled, for example 2*f1 together with f2 where f2 approaches f1.

Regards, Earl
"It is through science that we prove, but through intuition that we discover." - H. Poincare

"Most of all, start every day asking yourself what you will do today to make the world a better place to live in."  Mark Snoswell

"As we look ahead, we have an expression in Shell, which we like to use, and that is just as the Stone Age did not end for the lack of rocks, the oil and gas age will not end for the lack oil and gas, but rather technology will move us forward." John Hofmeister, president Shell Oil Company

Earl

#2
June 22, 2007, 02:23:32 PM
Hi All,

for those of you experimenting with 3-coil TPUs, here is a circuit for dividing by an odd number.

Regards, Earl
"It is through science that we prove, but through intuition that we discover." - H. Poincare

"Most of all, start every day asking yourself what you will do today to make the world a better place to live in."  Mark Snoswell

"As we look ahead, we have an expression in Shell, which we like to use, and that is just as the Stone Age did not end for the lack of rocks, the oil and gas age will not end for the lack oil and gas, but rather technology will move us forward." John Hofmeister, president Shell Oil Company

Earl

#3
June 22, 2007, 02:29:51 PM
Hi All,

Here is a simple circuit for generating a narrow pulse.  If a resistor is added as shown, the pulse can be made wider.  If following the resistor, the preset pin has a capacitor to Vdd, the pulse can be made quite large.  By replacing the resistor with a potentiometer as the resistance varies so will the pulse width.

Regards, Earl
"It is through science that we prove, but through intuition that we discover." - H. Poincare

"Most of all, start every day asking yourself what you will do today to make the world a better place to live in."  Mark Snoswell

"As we look ahead, we have an expression in Shell, which we like to use, and that is just as the Stone Age did not end for the lack of rocks, the oil and gas age will not end for the lack oil and gas, but rather technology will move us forward." John Hofmeister, president Shell Oil Company

Earl

#4
June 22, 2007, 02:33:51 PM
Hi All,

The top, right schematic left an input pin open i.e. hanging in the air.  This is a no-no.  It should be tied to Vdd since it is active LOW (the pin indicates this inversion with a little circle).

Also if the other half is not used, the unused D-flipflop should have all (unused) inputs going either to Vdd or ground, AS APPROPRIATE (not random, but thought over to not cause problems).

Regards, Earl
"It is through science that we prove, but through intuition that we discover." - H. Poincare

"Most of all, start every day asking yourself what you will do today to make the world a better place to live in."  Mark Snoswell

"As we look ahead, we have an expression in Shell, which we like to use, and that is just as the Stone Age did not end for the lack of rocks, the oil and gas age will not end for the lack oil and gas, but rather technology will move us forward." John Hofmeister, president Shell Oil Company
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