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Type: Posts; User: barry

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1. ## Thread: Calculate impedance in circuit of an OPAmp

by barry
Replies
2
Views
212

### Closed: Re: Calculate impedance in circuit of an OPAmp

Boy, you didn’t even ATTEMPT to hide the fact that you’re asking us to do your homework. Take your F, and then go find another career.
2. ## Thread: Impedance calculation in CMOS circuit

by barry
Replies
3
Views
210

### Closed: Re: Impedance calculation in CMOS circuit

Impedance is the reciprocal of transconductance.
3. ## Thread: Recommendations for Beginner

by barry
Replies
10
Views
610

### Closed: Re: Recommendations for Beginner

First of all, I would highly recommend NOT trying to do USB for a first FPGA project. There's a LOT under the surface of USB. Unless you can find a drop-in core (and even that will give you...
4. ## Thread: Zener Diode with LC circuit

by barry
Replies
6
Views
284

### Closed: Re: Zener Diode with LC circuit

Um, where’s the zener? This is making less and less sense. If you actually did have a zener in parallel with the LC, it would just conduct unlimited current when the input voltage exceeds the zener...
5. ## Thread: Zener Diode with LC circuit

by barry
Replies
6
Views
284

### Closed: Re: Zener Diode with LC circuit

It’s not clear what you’re asking for. I have no idea what you mean by “an LC circuit with the reverse-biased...” could you maybe draw a schematic or describe what you are trying to do? How do you...
6. ## Thread: Troubleshooting Circuit card

by barry
Replies
1
Views
179

### Closed: Re: Troubleshooting Circuit card

Voltmeter. Oscilloscope. Logic analyzer. No software is going to be able to identify a hardware problem, particularly if you don't want to use JTAG.
7. ## Thread: Quartus error 12006 'undefined entity'

by barry
Replies
6
Views
431

### Closed: Re: Quartus error 12006 'undefined entity'

Sorry, Cyclone IV. See, I told you I was a Xilinx guy.
8. ## Thread: Quartus error 12006 'undefined entity'

by barry
Replies
6
Views
431

### Closed: Re: Quartus error 12006 'undefined entity'

Aha! Thanks.

I'm a Xilinx guy. I searched a lot for any mention in the Intel docs, but didn't find much about clock buffers, but they did let me create one anyway. My whole problem stemmed from...
9. ## Thread: Quartus error 12006 'undefined entity'

by barry
Replies
6
Views
431

### Closed: Re: Quartus error 12006 'undefined entity'

It's a spartan 4. The buffer outputs go to the fabric, the inputs go to top level ports.

by barry
Replies
20
Views
1,026

### [SOLVED]Closed: Re: Question about MC33063

What is your input voltage? I think your inductor might be too small. Looking at the data sheet, they're using values of 170-220 uH. How did you "choose" that 10uH value?

(And I assume you meant...
11. ## Thread: Quartus error 12006 'undefined entity'

by barry
Replies
6
Views
431

### Closed: Quartus error 12006 'undefined entity'

I'm using Quartus Prime Lite and generated a clock buffer IP (using ALTIOBUF). It synthesizes fine in Synplify Pro, but when I try to compile the netlist, Quartus gives the error: "Error (12006):...
12. ## Thread: OP-Amp Circuit Design

by barry
Replies
6
Views
701

### Closed: Re: OP-Amp Circuit Design

Stupid assignment, IMO.

You could just cascade several high gain rail-to-rail opamps, open-loop, connect the power supply to 3V, and VOILA! always 3V out for all positive inputs.

by barry
Replies
6
Views
461

### Closed: Re: Two 10bit ADC microcontroller

Noise from the motors getting into your arduino? Software bug? You give us NOTHING to help you with.

by barry
Replies
6
Views
461

### Closed: Re: Two 10bit ADC microcontroller

Please do a google search yourself. There are HUNDREDS of microcontrollers that have multiple ADCs. You don't give any other requirements. And you do know that you don’t need an ADC to run a stepper...
15. ## Thread: Heart beat monitor by PIC16f877a

by barry
Replies
5
Views
530

### Closed: Re: Heart beat monitor by PIC16f877a

Whaaaaaat? You give us absolutely NO information about your hardware or software, and then you ask us to give you ”code to read a microcontroller?”

Do some work on your own, and then maybe someone...
16. ## Thread: Microcontroller pin not working after some time.

by barry
Replies
4
Views
356

### Closed: Re: Microcontroller pin not working after some time.

ESD? Over-temperature?
17. ## Thread: VHDL Simulation error using Xilinx ISE14.7

by barry
Replies
15
Views
904

### [SOLVED]Closed: Re: VHDL Simulation error using Xilinx ISE14.7

And that's why your simulation fails?
18. ## Thread: VHDL Simulation error using Xilinx ISE14.7

by barry
Replies
15
Views
904

### [SOLVED]Closed: Re: VHDL Simulation error using Xilinx ISE14.7

VHDL does not have a data type of "word". Is this defined in your package, which you haven't shown us?

by barry
Replies
15
Views
2,034

### Closed: Re: Addressable speaker system

First of all, putting a diode from input to output will probably make the whole thing fail, and certainly won’t solve any problem. Why didn’t your multi drop configuration work? Was it terminated...
20. ## Thread: ZYNQ Power Requirement

by barry
Replies
5
Views
603

### Closed: Re: ZYNQ Power Requirement

Do you mean VOLTAGE requirement? Or, do you really mean POWER? The voltage is specified by VCCO; it's in the data sheet. It depends on what your selected IO is: LVDS, LVCMOS, etc.

If you want to...

by barry
Replies
15
Views
2,034

### Closed: Re: Addressable speaker system

Three votes for UART. If you're going to use a microcontroller, you might as well use a UART. It will be a lot more reliable.

by barry
Replies
15
Views
2,034

### Closed: Re: Addressable speaker system

So you have to continuously send a pulse train of 1ms /2ms etc. period to keep the speaker enabled? First of all, that's not PWM, that's simply a train of pulses. If it works, I can't argue with it,...
23. ## Thread: Configuring ICE40 FPGA directly from ESP32 uC rather than using dedicated flash IC

by barry
Replies
7
Views
510

### Closed: Re: Configuring ICE40 FPGA directly from ESP32 uC rather than using dedicated flash I

Yes, you can use the SPI ports for your own nefarious needs after configuration. Just pay attention to what's attached to those ports.

by barry
Replies
15
Views
2,034

### Closed: Re: Addressable speaker system

If you design it properly, “it will work fine”. Long duration pulses? Low noise environment?

But why PWM, Why not a single pulse of a specific duration? Why a whole microcontroller when you could...
25. ## Thread: GND For Connector Shielding

by barry
Replies
5
Views
561

### Closed: Re: GND For Connector Shielding

You’ve got three different grounds shown there, that’s a little confusing. Where do they all go? Where do the shield connections of each connector actually go besides ground?
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