Tagged Questions

1
vote
4answers
94 views

What is important in computer clocks' signal: signal edges or intervals when signal is stable? Will multiple value propagation occur?

I am trying to figure out some basics of digital electronics. We have all seen the squared graph of the computer clock signal: I have read multiple articles on the Internet and still can't figure ...
1
vote
1answer
129 views

What IC should I use to make a binary clock?

I am wanting to make a binary clock. A lot of the schematics I've found are for Arduinos or Raspberry Pi. As much as I appreciate the use of minicontrollers, I don't want to do that for this ...
-2
votes
3answers
81 views

What would a voltage between 0 & 1 do to a AND-gate IC?

If I have a 7400 chip with an AND-gate (0 = 0V & 1 = 5V) would it be seen as 0 or 1 if the input is at 2V and also 4V?
2
votes
1answer
164 views

Does a 7400 IC used as AND-gate use any power when output is 0?

If I have a simple 7400 IC and using it for a single AND operation, would it consume any power when the AND is false and outputting 0V? If so, to what degree? 20mA or 20uA?
-1
votes
1answer
111 views

Mobile Server Uplink / GPS Coordinate Packet? [closed]

I'm completely uneducated when it comes to more advanced electrical engineering. I understand the very basics. I have over 12 years in software development / programming, but would like to extend my ...
0
votes
1answer
125 views

7475 IC strange behavior

So I'm trying to make a shift register with the 7475 IC /4-BIT BISTABLE LATCHES/. The problem is that the single latches doesn't seem to switch their states properly. I'm using this schematic: ...
0
votes
2answers
2k views

How to build a 4 to 16 decoder using ONLY TWO 2 to 4 decoders?

Help please, I am new to circuits and decoders and I need some serious help. How to build a 4x16 decoder using ONLY two 2x4 decoders? Following the steps we took in the lecture, we are supposed to ...
8
votes
2answers
3k views

Connecting AND Gate Chip to an Integrated Circuit

I am trying to teach myself how to make integrated circuits and I'm having trouble integrating an AND gate into the circuit though. I took a picture of it. The voltage running across the power rails ...
0
votes
3answers
439 views

Anyone know of a 2-1 mux chip?

I'm trying to find an IC implementing 2-1 multiplexers, but I could only seem to find chips like this: SN54LVC157A - Quadruple 2-line to 1-line data selectors/multiplexers. Where there are 2 groups ...
5
votes
2answers
850 views

What is the difference between a nonretriggerable and retriggerable One Shot?

One shot is a monostable multivibrator, it is normally in a stable state but once triggered it changes to an unstable state. But I can't understand the difference between a nonretriggerable and a ...
2
votes
1answer
570 views

What is the fastest 7400 series family? Is 74VHC faster than 74AHC?

What is the fastest 7400 series logic family? Is 74VHC* faster than 74AHC*? This list does not seem to be in any particular order: http://en.wikipedia.org/wiki/7400_series
2
votes
3answers
128 views

Detecting which pins are inputs or outputs

I have an idea to make a device with a generic ZIF socket which can be used to identify any chip you place into it and once identified run a suite of tests to verify that the chip is functional. I ...
0
votes
3answers
282 views

Does this timer circuit make sense?

I want to make a timer that counts down from 15 minutes, in 5 minute intervals. It should use 3 LEDs, and behavious should be such that when it is switched on, all 3 LEDs are lit. Then after 5 mins ...
3
votes
1answer
223 views

can pins 3 and 11 on the 556 timer use the same capacitor to ground?

can the control voltage pins 3 and 11 on the 556 timer use the same capacitor to ground? I assume that I can double the capacity of the 0.01\$\mu\$ capacitor to 0.02\$\mu\$ and share the capacitor ...
2
votes
4answers
595 views

Is there an IC for a 32:5 Encoder?

I need a part similar to a 74HC148 8:3 encoder, but which takes 32 input lines and encodes them to a 5 bit value. I can guarantee that only one of the 32 will be high at a time, so I don't even need ...
4
votes
2answers
258 views

Are there any convenient “bus keeper” or “bus hold” chips?

Many CPLDs have a handy feature which will weakly drive pins toward their present state, so that a pin which is weakly pulled high will pull high and one which is weakly pulled low will pull low. Are ...