BradtheRad
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20th January 2019, 02:53A basic method to take cube root of 9: * take log(9) * divide by 3 * take antilog A scientific calculator has a button to calculate X to the Y...8 replies | 330 view(s) -
20th January 2019, 02:27BradtheRad replied to a thread Why is the European mains voltage so well regulated? in Elementary Electronic QuestionsI think of us consumers asking for more power to our appliances, as we reduce load resistance seen by the electric company. Normally this causes...11 replies | 495 view(s)
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19th January 2019, 07:37I've worked with the 4066. It's easy to use. Suitable for AC signals in either direction. Many schematics use it in audio projects, which implies it...3 replies | 123 view(s)
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19th January 2019, 02:25I picture a computer program where you input data from each teacher: (a) preferred days and hours, (b) non-preferred hours, (c) neutral hours. Also...2 replies | 177 view(s)
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19th January 2019, 01:43Of interest to hackers are articles telling how to modify an ordinary FM radio (max freq 108 MHz) so it brings in higher frequencies. It might not...5 replies | 283 view(s)
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17th January 2019, 00:34BradtheRad replied to a thread Is there a safe way to fix this scratch on the hot side of PSU? in Power ElectronicsI used the CircuitWorks silvery conductive pen and silver epoxy. They stuck to PV cells when I needed to attach wires but I vaporized the solderable...4 replies | 220 view(s)
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15th January 2019, 07:32R16 (470 ohms) looks as though it could be a pull-up resistor. Is that correct? Try a higher ohm value because 470 ohms wastes 10mA and moreover may...8 replies | 260 view(s)
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15th January 2019, 07:04As a general rule when you increase frequency, it pushes the inductor/transformer further into CCM (continuous conduction mode). This means the...6 replies | 213 view(s)
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15th January 2019, 06:35Does your project draw low power? Here is an AC-in-AC-out voltage multiplier. It has positive and negative Villard cells. The transistors feed a true...10 replies | 387 view(s)
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14th January 2019, 01:49As soon as we upload an attachment, I believe we should submit the post quickly because the attachment is preserved only a short time in limbo.17 replies | 538 view(s)
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13th January 2019, 03:59BradtheRad replied to a thread Medical Physics - Alpha Radiation Highly Ionizing: Why is it dangerous? in Mathematics and PhysicsOur body's cells can repair a minor amount of damage from radiation. Of particular concern is our thyroid gland. It is susceptible to...4 replies | 490 view(s)
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11th January 2019, 09:07BradtheRad replied to a thread How create negative voltage -700mV - -1000mV 30mA? in Analog Circuit DesignThis is a simple negative polarity charge pump circuit. You may find you can use a 555 IC for the role of both clock and half-bridge. Or perhaps it...13 replies | 569 view(s)
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11th January 2019, 05:42BradtheRad replied to a thread PV panel oriantation vs horizon shading in winter in Power ElectronicsIt might help if you reflect sunlight onto the shaded area. Shiny sheet metal, strips of aluminum tape, etc. Mount it at the uproof edge of the PV...5 replies | 330 view(s)
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10th January 2019, 19:51David_ started a thread Using PLL(CD4046) to generate a 90° shifted signal, how to manage 10Hz - 1MHz? in Analog Circuit DesignHello. A couple of years ago or something I was getting advice here on EdaBoard about how to design a dual-channel Lock-In Amplifier(LIA) with the...3 replies | 205 view(s)
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10th January 2019, 05:03BradtheRad replied to a thread [SOLVED] Solar panel allowable mounting overhang in Mechanical Engineering and DesignIf just one of the cells' impedance goes up a lot then panel output drops severely. The shadow's effect may change if you rotate the panels 90...4 replies | 784 view(s)
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10th January 2019, 04:13BradtheRad replied to a thread When Bus Transceivers/Buffers come in handy in an embedded design? in MicrocontrollersSCSI was once common in Macintosh computers. In every installation we had to consider whether a SCSI device needed a 'terminator' (connector with a...5 replies | 261 view(s)
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4th January 2019, 08:54BradtheRad replied to a thread Losses in inductor of a boost converter in Professional Hardware and Electronics DesignDiagram per advice in post #5. Current through low-ohm resistor produces voltage. Be aware of polarity of your waveforms. Your prof is...17 replies | 746 view(s)
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3rd January 2019, 09:47BradtheRad replied to a thread Losses in inductor of a boost converter in Professional Hardware and Electronics DesignAlthough you may succeed at using an indirect approach (taking measurements in other components) I reckon the prof hopes that you grasp inductor...17 replies | 746 view(s)
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3rd January 2019, 07:03BradtheRad replied to a thread prevent nmos from overvoltage damage in Elementary Electronic QuestionsIs your ignition coil the same as found in an automobile? Car repair manuals tell how to test a coil's DC resistance with an ohmmeter, and what range...19 replies | 769 view(s)
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2nd January 2019, 06:51You can't take a plain voltage reading and tell how much charge is in a battery. You need to measure how many Amp-hours go to or from it. To do this...7 replies | 418 view(s)
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1st January 2019, 02:51BradtheRad replied to a thread Losses in inductor of a boost converter in Professional Hardware and Electronics DesignThere's a puzzle because the inductor generates voltage at the very moment you wish to measure power through it (Watts=V x A). This voltage is always...17 replies | 746 view(s)
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31st December 2018, 09:41BradtheRad replied to a thread Losses in inductor of a boost converter in Professional Hardware and Electronics DesignOperating cycle has two parts: (a) flux builds in the inductor (Amperes rising), and (b) flux collapses (Amperes falling). Take an oscilloscope...17 replies | 746 view(s)
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31st December 2018, 06:28BradtheRad replied to a thread AF modulator in Transmitter what is the A2000? in RF, Microwave, Antennas and OpticsTDA 2005 has cousins, also rated several Watts which are easy to use. Example, Radio Shack carried TDA2002/LM383. It helps their popularity...11 replies | 460 view(s)
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31st December 2018, 05:28The simplest and easiest arrangement is to charge batteries in series. Then you know each battery receives the same current level. Suppose your...7 replies | 418 view(s)
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31st December 2018, 00:00BradtheRad replied to a thread AF modulator in Transmitter what is the A2000? in RF, Microwave, Antennas and OpticsEnglish translation of the article is below. (Chrome web browser, Win7). A Google search on 'A2000 op amp' finds discussions stating it's part of a...11 replies | 460 view(s)
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30th December 2018, 23:17Do you mean 3 Amp-hours? If you wish to charge it in one day then a reasonable charge rate is 10-20 percent of 3, which makes 300 to 600 milliAmps....7 replies | 418 view(s)
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29th December 2018, 08:28I guess you mean radiation as in nuclear and cosmic radiation? A scintillator is a possible project. It requires a special sensor. A Geiger meter...3 replies | 299 view(s)
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27th December 2018, 07:53Diode-capacitor-resistor networks shape bias current to a transistor. Load receives one-time ramp-up ramp-down voltage. This is simulation shows the...29 replies | 1468 view(s)
About BradtheRad
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- Born 1953. Some college.
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