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Results tagged with digital-logic
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user 40487
Digital electronics treats discrete signals, unlike analog electronics which treats continuous signals. Digital logic is used to perform arithmetic operations with electric signals and constitutes the base for building CPUs.
1
vote
Accepted
Caesar cipher - digital circuit
I thought about using modular arithmetic
Yup, that's how you do it, alright.
but I did not find a simple way to do that either.
And, if you're going to build it up out of ICs you're not going to fi …
- 61k
2
votes
How long can I run a portable washing machine which requires 220V and 300W from a 12V, 120AH...
12 V times 120 Ah gives 1440 Wh. 1440 Wh/300 W gives 4.8 hours. Figure about 4 hours since your inverter will not be 100% efficient. Reduce that to 2 hours, since you don't want to discharge your batt …
- 61k
0
votes
Toggle circuit with 1 x NAND, OR, and NOT gates?
The simple answer is no.
Using your available components, you can make a weird variant of an SR flip-flop (opposite polarities on the inputs), but you need another level of circuitry to get edge acti …
- 61k
2
votes
Accepted
How to differentiate a control path signal over data path signal?
The simple answer is, yes, you've done it correctly. But it can get more complicated than that.
In a "normal" computer, control and data information are both sent along a common path between a storag …
- 61k
1
vote
40 binary inputs to 6-bit output binary coded number
I assume you want to activate one of 40 inputs, such as switches, and get out a binary number identifying which input is active, right?
Assuming that, the "simplest" way is to use priority encoders. …
- 61k
1
vote
Solder joint used between copper wires and a button switch is behaving strangely. I don't th...
1) You understand that the set switch needs to be open to operate the latch. Are you quite certain that your switches are NC (normally closed)? Those things are pretty rare. And the switch symbols you …
- 61k
1
vote
Accepted
SR latch using NAND gates
In principle, yes, the two can form an oscillator. However, any mismatch in propagation delay (no matter how small) will cause the oscillation to die out. In any practical circuit this will happen alm …
- 61k
8
votes
74HC/HCT: What to do with unused inputs and why?
Connect to either Vcc or GND. It makes no difference. With no load on the outputs, the current in the internal transistors will be about the same.
Or use a pullup or pulldown - again it makes little …
- 61k
3
votes
Accepted
Theory for 3-bit full adder and calculations with un-/signed integers
Yes, it can be either. It will work with unsigned 3-bit numbers. It will also work with 2s complement signed numbers. You'll need to do a bit of study, but the thing to remember with 2s complement is …
- 61k
1
vote
How do I convert a digital panel meter that reads 2.4 V to 30 V to read 200 mV full scale?
Notice the first sentence: "Monitor DC voltage between 2.4V and 30V with this simple 2-wire voltmeter"
The fact that it is a two-wire voltmeter means that it is powered by the voltage it is measuring …
- 61k
2
votes
Circuit to test ICs at home? (74hc04, 74hc08, 74hc32)
7400 series ICs take a bit of getting used to, as they are not as straightforward as, for instance, 74HC00 types.
Here are circuits to use with, for instance, the 7404 and 7400.
You'll note that …
- 61k
3
votes
Circuit to keep two LEDs on when buttons are released
Although you have already selected Spehro's answer, I thought you ought to learn a little about using LS series ICs.
LSTTL, like regular TTL, has an input which is essentially an NPN transistor with …
- 61k
2
votes
Troubles making a counter count from 1 to 12
You are using your counters entirely wrong. Do not derive a logic signal to drive a clock. Never, never, never. Instead, run the clock to all counters and then derive logic as follows
simulate …
- 61k
3
votes
Accepted
Would like some help with Logic Gates, Trying to use two inputs to create three outputs
Try this
simulate this circuit – Schematic created using CircuitLab
- 61k
1
vote
Accepted
logic gates simplest square wave generator
The simplest circuit, given your data, is
simulate this circuit – Schematic created using CircuitLab
Look at the inverter. Assume, just for the moment, that the output is high. Since this is a …
- 61k