barry
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Today, 00:49barry replied to a thread [SOLVED] making -15/+15v out of single power supply 12Vdc Problem in Elementary Electronic QuestionsI think you should read about voltage doublers.22 replies | 466 view(s)
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14th November 2018, 06:27There is nothing intrinsically better in the 2-process style. Why is the one process a failing?? And "aren't designed for HW development"?? That's...43 replies | 1357 view(s)
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13th November 2018, 19:47You got a latch BECAUSE of your "when others" statement (and perhaps other reasons, too). This is explicitly saying: 'latch the present value if no...43 replies | 1357 view(s)
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13th November 2018, 19:37What do you mean a "normal wired cable"? Lamp cord? And, again, what is your data rate? And RS-485 is good for 1200 meters. Your cable must be...9 replies | 229 view(s)
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13th November 2018, 17:18Look at this: http://www.cablesizer.com/help/principles/3 replies | 173 view(s)
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13th November 2018, 17:08barry replied to a thread iR based circuit help needed in Hobby Circuits and Small Projects ProblemsSounds like you want us to do your homework for you. Not going to happen. Show us that you've done something other than collect a box of virtual...4 replies | 143 view(s)
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12th November 2018, 19:11You still need twisted pair for that.9 replies | 229 view(s)
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12th November 2018, 18:59oh, yeah, coax. And tin cans and string. You don't mention required data rate...9 replies | 229 view(s)
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12th November 2018, 17:51Why not use an inductor as an inductor? If you use a wirewound resistor as an inductor it's going to be a pretty lousy inductor because of the added...3 replies | 140 view(s)
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12th November 2018, 17:46barry replied to a thread I2C Programming for slave(transmitter) for sending 2 byte to another PIC controller in MicrocontrollersThere is a TON of information out there. Just do an internet search "PIC I2C communication". It's easy! Nobody is going to give you a program just...5 replies | 182 view(s)
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12th November 2018, 17:371) Very strange request. 2) Fiber optics. 3) Wireless.9 replies | 229 view(s)
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9th November 2018, 07:46Huh? A 'fixed PWM OF 30 % duty at 500 Hz' is not PWM. That's a pulse train. Of course this is possible. And, you do realize that this uP has a...9 replies | 297 view(s)
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8th November 2018, 16:45barry replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsSo, as mentioned a long time ago, maybe that IC is bad. Maybe C4 is bad. If you look at the schematic of the LNK626, theres a zener from BP to S. If...21 replies | 591 view(s)
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8th November 2018, 00:37barry replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsNot if S and BP are supposed to be connected. And I'm afraid I must disagree with betwixt. If there's something wrong with the output circuit...21 replies | 591 view(s)
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7th November 2018, 22:39barry replied to a thread Design of a PCIe card with USB and Ethernet in PLD, SPLD, GAL, CPLD, FPGA DesignIt can be done in an FPGA, but I've never done it. All FPGA vendors sell cores for it. I think EVERYTHING about implementing ethernet from scratch is...7 replies | 450 view(s)
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7th November 2018, 05:44Who said anything about a converter or a control loop?4 replies | 227 view(s)
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7th November 2018, 05:18A harmonic is not noise. And an isolation amp is not going to suppress a harmonic unless it's bandwidth is way less the the harmonic. I think what...4 replies | 227 view(s)
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6th November 2018, 22:50barry replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsThis might indicate that the original capacitor failed because of ANOTHER failure downstream. Without a schematic all we can do is make guesses as to...21 replies | 591 view(s)
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5th November 2018, 04:07barry replied to a thread [SOLVED] Operating voltage reference within spec in Elementary Electronic QuestionsThat's what it says. At 25 deg. C1 replies | 121 view(s)
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5th November 2018, 03:58barry replied to a thread VIVADO: crossing clock domain - poor placement message in PLD, SPLD, GAL, CPLD, FPGA DesignI'm not a Verilog guy, but that doesn't look right to me. Isn't that just going to set clk_slow high forever? I would look at your constraints. It...13 replies | 345 view(s)
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5th November 2018, 01:51barry replied to a thread VIVADO: crossing clock domain - poor placement message in PLD, SPLD, GAL, CPLD, FPGA DesignUsing the outputs of a counter for different clocks is not great practice. I would suggest you use a clock enable instead. In other words, use the...13 replies | 345 view(s)
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4th November 2018, 20:54barry replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsYou need a new teacher.21 replies | 591 view(s)
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4th November 2018, 18:46barry replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsYou want know if replacing a capacitor with one of less than half the value is ok? What do YOU think? You could just parallel two them.21 replies | 591 view(s)
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4th November 2018, 17:34barry replied to a thread [SOLVED] operating a zener to specified values in Elementary Electronic QuestionsI'm not sure how much more they can hit you over the head with this: first line of the table on page2: Izt=5ma, Vz 1.8-2.11. However, 2.11 is...4 replies | 235 view(s)
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4th November 2018, 05:46barry replied to a thread [SOLVED] operating a zener to specified values in Elementary Electronic QuestionsRead the data sheet. They ALWAYS specify the zener voltage at some current. Then they give you some pretty graphs to look at that show voltage versus...4 replies | 235 view(s)
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4th November 2018, 01:58barry replied to a thread Modifying a 60W offline SMPS PCB to achieve a pass in conducted EMC in Power ElectronicsYou are trying to pass EMC testing with a piece-of-crap design? A design that you already KNEW would fail? What kind of company do you work for?...2 replies | 189 view(s)
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4th November 2018, 01:51And one more thing: current limiting resistors for the leds? The most the '595 can sink is 6ma12 replies | 419 view(s)
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3rd November 2018, 08:11Have you tried looking at signals with an Oscilloscope?12 replies | 419 view(s)
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3rd November 2018, 06:11The shifting is the in the shift register, which shifts at 10 Hz, and will probably just look like one bright led and 7 dim ones.12 replies | 419 view(s)
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2nd November 2018, 21:38I didn't look that closely, but it looks like you're shifting at about 10 Hz. That seems pretty fast to mem.12 replies | 419 view(s)
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