barry
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Today, 15:47How are you limiting the inrush? If, you REALLY are limiting the current through the PMOS to 0.4mA, then it shouldn't BURN UP. But that 120 ohm...2 replies | 74 view(s)
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Today, 15:42Just remember if you boost voltage, you're going to cut current. A decent AA battery should be able to produce about 1A at 1.5V, but if you want 12V,...2 replies | 54 view(s)
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21st September 2019, 18:17I’m not sure there’s a monolithic device, but you could build one using a very high speed opamp (GBP> 1GHz) and high speed diodes. Just do a search...3 replies | 147 view(s)
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21st September 2019, 00:20barry replied to a thread Runtime of clock using alkaline D cells instead of AA batteries in Elementary Electronic QuestionsThen you're going to need to get the manufacturers curves. Or, use some of your reasoning power . If the D has 13000 and the AA has 2400==>...11 replies | 245 view(s)
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20th September 2019, 22:42barry replied to a thread Runtime of clock using alkaline D cells instead of AA batteries in Elementary Electronic QuestionsDo the math: Alkaline AAs have 2400mA-H of capacity; Ds have 13000mA-H. These values depend somewhat on the load.11 replies | 245 view(s)
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20th September 2019, 18:41What do you mean you want to "capture a jitter"? Do you mean you want to measure jitter? Maybe you want to capture a glitch? Please elaborate3 replies | 147 view(s)
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20th September 2019, 05:59You do things like putting common-mode chokes on the power inputs, but if you’re going to be selling this product, you’ll probably need to have it...8 replies | 390 view(s)
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19th September 2019, 16:45So, if you knew the answer, why did you bother asking the question? As far as EMC, you need to be a LOT more specific. Different countries have...8 replies | 390 view(s)
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18th September 2019, 21:32Overvoltage: SCR crowbar; BJT/zener clamp; overvoltage protection IC Overcurrent: Fuse; circuit breaker; regulator with built-in current-limiting;...8 replies | 390 view(s)
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18th September 2019, 15:45That (goofy) circuit has none of the features you mention, other than the inexplicable rectifier bridge on the 24volt input. Why would you have a...8 replies | 390 view(s)
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17th September 2019, 17:16Why a resistor in parallel? That will just change the voltage scaling.8 replies | 318 view(s)
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17th September 2019, 16:29Your attachment tells us nothing, other than the physical dimensions of the transformer and that there are a 330 and 470 ohm resistors on the...8 replies | 318 view(s)
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17th September 2019, 14:28It says right there : maximum current, 5 amps. What’s your question? If you exceed the PLAINLY STATED manufacturer’s spec, you’re on your own....8 replies | 318 view(s)
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14th September 2019, 06:47I’m not about to analyze 5000 lines of code, but it looks like your problem is that it multiplexes the 4 digits properly and then blanks them for a...3 replies | 232 view(s)
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13th September 2019, 23:01barry replied to a thread FYP ideas suggestion on FPGA, or FPGA based network processing/network on chip in PLD, SPLD, GAL, CPLD, FPGA DesignI don’t know what a ‘fyp tittle’ is. Could you explain?5 replies | 294 view(s)
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13th September 2019, 21:46barry replied to a thread [SOLVED] Diode performance specification in Elementary Electronic QuestionsWhich is telling you that if those are critical parameters for you, you shouldn’t be using that particular device. It’s like asking what the 0 to 60...4 replies | 426 view(s)
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12th September 2019, 18:56barry replied to a thread Operating four Tx-Rx pairs in close proximity in Hobby Circuits and Small Projects ProblemsI'm a bit confused. If your input scanning rate is slow, you can sample an input, transmit the appropriate data, and then wait an eternity before you...7 replies | 324 view(s)
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12th September 2019, 17:39barry replied to a thread Operating four Tx-Rx pairs in close proximity in Hobby Circuits and Small Projects ProblemsCan you synchronize the transmitters so that only one is transmitting at a time?7 replies | 324 view(s)
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12th September 2019, 16:46barry replied to a thread Operating four Tx-Rx pairs in close proximity in Hobby Circuits and Small Projects ProblemsI'm not an RF guy, but I have to believe that if you've got four transmitters running at the same frequency, a receiver is going to get garbage.7 replies | 324 view(s)
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11th September 2019, 21:37barry replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsThere are thousands of diodes that would work. The two I recommended are extremely common; cheap and plentiful. What’s wrong with those? If you don’t...15 replies | 867 view(s)
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11th September 2019, 16:06barry replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsThose are Schottky diodes. If you had actually gone to the trouble of reading the data sheet, you’d see that they have 1ma of reverse leakage...15 replies | 867 view(s)
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9th September 2019, 20:57barry replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsThe ONLY possible current path is through reverse biased diodes. Either you've got something wired wrong, or those diodes are leaking.15 replies | 867 view(s)
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9th September 2019, 14:46barry replied to a thread Change colors of liquid crystal display in Hobby Circuits and Small Projects ProblemsWHAT??? You had a white LED which gave a blue background and white numerals. Then you changed the LED to red, which gave you a red background with...5 replies | 507 view(s)
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8th September 2019, 04:10barry replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsI’m not even sure WHAT this circuit does. Just a whole bunch of diodes.15 replies | 867 view(s)
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8th September 2019, 01:33barry replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsYou don’t tell us switch positions or component values or what that “volt meter” is, but I suspect you’ve got some leakage through your diodes, or...15 replies | 867 view(s)
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5th September 2019, 18:51barry replied to a thread Spacing Between PCB Pad and HEATSINK in PCB Routing Schematic Layout software and SimulationI've seen the breakdown voltage of air listed as 1.1KV/mm; and as 30KV/cm. Not sure where those come from, and they're quite different. There's also...3 replies | 403 view(s)
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5th September 2019, 02:10Your MUX will also have some resistance. And a tolerance.9 replies | 515 view(s)
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3rd September 2019, 16:17barry replied to a thread Digital Storage Oscilloscope - newbie questions in Elementary Electronic Questions1) what do you mean "normal"? Yes, there will be ripple on a regulator output. It depends on load, input, filtering...15 replies | 609 view(s)
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3rd September 2019, 16:14barry replied to a thread Generating the waveform as in the image in RF, Microwave, Antennas and Optics1) buy a signal generator with burst function. 2) use a dds chip 3) use an fpga with a DAC and create your own dds. 4) use a 3KHz oscillator and a...6 replies | 324 view(s)
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