BradtheRad
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Yesterday, 22:21BradtheRad replied to a thread division of two values with op amps in Elementary Electronic QuestionsI think of doing analog multiplication by starting with a given voltage (to be the first number), then applying gain (to be the second number) via...10 replies | 274 view(s) -
24th May 2019, 02:52BradtheRad replied to a thread Design and construction of scintillometer for evapotranspiration in MicrocontrollersConsider putting a filter in front of the photodetector. Website listing a narrowband 405 nm filter. $95. ...27 replies | 2919 view(s)
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22nd May 2019, 06:53BradtheRad replied to a thread Question about transmitter in Hobby Circuits and Small Projects ProblemsIf your rf detector can pick up a wide range of frequencies then you can try a transmitter in a garage door remote, or a car's remote, or wireless...7 replies | 378 view(s)
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22nd May 2019, 05:45BradtheRad replied to a thread Can't get digits other than 'zero' in 4-DIGIT 7-SEGMENT DISPLAY in MicrocontrollersIsn't this what happens when you do a test of all connections? By changing state at a certain pin, and it makes the IC light up everything on the...6 replies | 487 view(s)
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22nd May 2019, 04:33Consider amplifying your signal by means of a transistor in common-base operation. It provides high gain. This simulation shows the concept. ...12 replies | 738 view(s)
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20th May 2019, 07:13BradtheRad replied to a thread [moved] Power generator on Boeing passenger planes? in Power ElectronicsThe article tells how the 787's designers gave ever more functions to be done by electricity, and it seems to include crucial systems. Perhaps...4 replies | 222 view(s)
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19th May 2019, 22:11BradtheRad replied to a thread [moved] Convergenge issue PSpice- LM5022 in Software Problems, Hints and ReviewsTry increasing your tilmestep by 10x. Run the simulation again. If it makes you wait a long time then increase it further. A reasonable timestep...14 replies | 443 view(s)
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19th May 2019, 01:13BradtheRad replied to a thread Design and construction of scintillometer for evapotranspiration in MicrocontrollersThe Ebay listing is a spectrometer. It's not likely you can aim it at the dirt and read moisture content. Not that I know anything but on a...27 replies | 2919 view(s)
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18th May 2019, 22:21BradtheRad replied to a thread Re. PADS pcb won't open (after mains power returned) in Software Problems, Hints and Reviews* Is your file corrupted on disk? See if you can duplicate it, or move it, or rename it. An error suggests it is no longer usable. If you can...1 replies | 126 view(s)
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18th May 2019, 19:02This method is not precisely the same as the thread topic but it has the same result. And it needs no op amp. Villard voltage doubler. Accepts AC...16 replies | 2046 view(s)
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18th May 2019, 18:28BradtheRad replied to a thread [moved] Convergenge issue PSpice- LM5022 in Software Problems, Hints and ReviewsDoes it work (or does it break) if exposed to negative polarity? What happens when the AC supply goes into negative region?14 replies | 443 view(s)
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17th May 2019, 22:48BradtheRad replied to a thread [moved] Convergenge issue PSpice- LM5022 in Software Problems, Hints and ReviewsWhat is supposed to be the power supply for the control IC? Your power supply icon appears to be AC. Instead it is normal to supply DC to a boost...14 replies | 443 view(s)
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17th May 2019, 02:23BradtheRad replied to a thread [CST-MWS] How to get data-points for 2D geometry? in RF, Microwave, Antennas and OpticsTo send only the outline: 1) Send a code which designates row 1. 2) Starting from the left, send column position of each pixel which is turned...4 replies | 206 view(s)
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16th May 2019, 23:28BradtheRad replied to a thread [moved] Convergenge issue PSpice- LM5022 in Software Problems, Hints and Reviews* C4 can be removed. Or else put a low-ohm resistor inline with it. By itself it's charged immediately by the power supply. In real life it's okay to...14 replies | 443 view(s)
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16th May 2019, 11:33BradtheRad replied to a thread Fully differential continuous time integrator in Analog Circuit DesignDoes this setup resemble yours? PWM is fed to a DCR integrator, so it is smoothed to a volt level in the range 0 to 5v. Duty cycle ranges from...2 replies | 557 view(s)
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16th May 2019, 07:12BradtheRad replied to a thread Phase and frequency locking multiple (9 units) LLC drivers that are each 10cm apart in Power ElectronicsIt sounds as though you're trying to impose one resonant frequency where your various converters have different resonant frequencies. I wonder if...15 replies | 439 view(s)
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16th May 2019, 05:25BradtheRad replied to a thread shape sensor can be used with a prosthetic hand in Robotics and Automation ForumI picture a grid of switches, packed densely so that at least one switch is pressed by a corner of a square when the hand squeezes it. * Therefore...2 replies | 714 view(s)
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16th May 2019, 04:52BradtheRad replied to a thread [SOLVED] Negative voltage needed in K-band in RF, Microwave, Antennas and OpticsMethod to derive a negative supply from positive pulses. The oscillator is made from 2 invert-gates (powered by a default 5V supply although of...3 replies | 1341 view(s)
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15th May 2019, 00:39A cold filament is exposed to extreme surge current by direct hookup to mains. On the other hand a transformer self-limits current output, because...19 replies | 732 view(s)
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14th May 2019, 23:55BradtheRad replied to a thread Design and construction of scintillometer for evapotranspiration in MicrocontrollersSee if moisture changes the soil in some measurable way, such as: * electrical conductivity (DC or AC various frequencies) * acoustic or...27 replies | 2919 view(s)
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14th May 2019, 03:55Expect the die's tiny teeth to break on tungsten carbide. You might manage to cut a thread on a lathe with diamond-tipped tool. Set the carriage...20 replies | 7424 view(s)
About BradtheRad
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- Born 1953. Some college.
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