BradtheRad
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Today, 02:38BradtheRad replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsIt is common to use a 9V battery to power CMOS circuitry. I have a hunch the builder started with a single 9V, but found it died after a few minutes...25 replies | 774 view(s) -
Yesterday, 05:10BradtheRad replied to a thread What the general rules of Protecting the DC Switching Power Supply in Elementary Electronic QuestionsAs a general rule, decide which components you wish to protect. Here are factors to consider: * Is the component expensive? * Is component...4 replies | 121 view(s)
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Yesterday, 03:25BradtheRad replied to a thread Simple overnight charger for 5 x AA batteries in RF, Microwave, Antennas and OpticsThe other thread which you linked has Brian's suggestion to install a shunt (two diodes in series) across the battery. It's an easy safety feature...9 replies | 203 view(s)
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Yesterday, 02:08BradtheRad replied to a thread I need calculate and measure C2, C3,C1 for active inductor in RF, Microwave, Antennas and OpticsThe RC networks create a similar time constant that you'd get from an inductor, or LR network. It appears that your schematics present various RC...1 replies | 95 view(s)
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Yesterday, 01:56Just for fun I sometimes tune my waveform generator to frequencies that can be picked up on my AM radio nearby. The waveform generator is low power...7 replies | 243 view(s)
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Yesterday, 01:16BradtheRad replied to a thread How to choose a suitable sampling frequency for this current sensor? in Power ElectronicsI guess I ought to clarify my earlier remark: It is common to see Ampere draw go up when motor speed goes down (or stalls). A free-running motor...10 replies | 242 view(s)
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15th October 2018, 04:31BradtheRad replied to a thread How to choose a suitable sampling frequency for this current sensor? in Power ElectronicsBy measuring average Ampere draw you can get an approximate idea of motor speed, Calculate the average of a hundred readings per second, or ten or 1...10 replies | 242 view(s)
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14th October 2018, 06:44The H-bridge creates AC at the load by acting like a buck converter in one direction, then it turns around and acts like a buck converter in the...13 replies | 389 view(s)
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14th October 2018, 05:04A transistor bias takes such small current level that you can expect to need a large expensive inductor. Therefore in this case you might prefer to...3 replies | 184 view(s)
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14th October 2018, 04:32BradtheRad replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsNaturally electronics is all that. Elements of science fiction. Elements of magic. It's one of those excellent things in life, to immerse yourself in...25 replies | 774 view(s)
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13th October 2018, 21:35Simulation showing SPWM waveforms with 1 kHz carrier. Each pulse goes all the way to the zero line, for the reason that the component models are...13 replies | 389 view(s)
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13th October 2018, 04:43The diffuser idea looks practical. How about a clear jar containing liquid with tiny reflective particles suspended in it?14 replies | 318 view(s)
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13th October 2018, 03:14Yes, the LC arrangement is able to shape pulses into a sinewave. It can shape a plain AC square wave into a sinewave. You can also put the LC in...13 replies | 389 view(s)
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12th October 2018, 00:59Your waveform resembles a correct sine PWM to a resistive load, but unsmoothed by a low-pass filter. Because it covers an entire AC cycle, with...13 replies | 389 view(s)
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10th October 2018, 10:42BradtheRad replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsYour videos show one readout being changed, then that number is copied to another readout. It's ambitious enough at this time for you to try...25 replies | 774 view(s)
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10th October 2018, 04:57BradtheRad replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsMost of the readouts have unchanging numbers. It is easy to provide 10-15 mA of current to each desired LED in the display and produce any character...25 replies | 774 view(s)
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10th October 2018, 04:43BradtheRad replied to a thread [SOLVED] MFB narrow bandpass review and other active filter related questions in Elementary Electronic QuestionsThe twin-T makes a good notch filter. Evidently it is able to split the signal into two different phase relationships, thus cancelling the center...11 replies | 390 view(s)
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10th October 2018, 02:55BradtheRad replied to a thread How to drive a 1MHz Ultrasound-TD1000KA in Hobby Circuits and Small Projects ProblemsThe weblink has sample output (Sensitivity test). It looks as though drawn by an oscilloscope. Do you want an analog-to-digital converter? Likely...6 replies | 173 view(s)
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10th October 2018, 02:37The motor's greatest torque and best efficiency is at a certain speed. It is a combination of the right inertia and the right magnetic attraction. ...7 replies | 441 view(s)
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10th October 2018, 02:20BradtheRad replied to a thread Simulation time depending on value of inductance in Power ElectronicsPossible reason: The smaller inductance responds more quickly, causing shorter switching cycles. Thus you have more cycles in a given time, and the...2 replies | 116 view(s)
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10th October 2018, 01:03BradtheRad replied to a thread Frankling VFO converted to VCO - problems in RF, Microwave, Antennas and OpticsYour schematic appears to have two potentiometers at left. Did you install them? Do they tune frequency? Or could they be for adjusting gain? ...19 replies | 569 view(s)
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9th October 2018, 05:491. Your schematic has a 0V ground icon, with the only other connection being to an optoisolator. Hence the simulator may be unable to determine what...32 replies | 1417 view(s)
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9th October 2018, 01:55BradtheRad replied to a thread [SOLVED] MFB narrow bandpass review and other active filter related questions in Elementary Electronic QuestionsThe simple LC network is hard to beat. Its resonant behavior rejects all frequencies except its center frequency. Higher Q is associated with less...11 replies | 390 view(s)
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9th October 2018, 00:38Simplified schematic of 60 Hz frequency conversion to 50 Hz, while dropping 120V mains to 24 VAC. The 3uF capacitor drops a large portion of...8 replies | 303 view(s)
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7th October 2018, 23:57BradtheRad replied to a thread Replacing TTL logic with discrete components in Analog Integrated Circuit (IC) Design, Layout and FabricationNo, I followed a similar schematic in Forrest Mims Engineer's Notebook. (I posted a link in your other thread.) Purchased at Radio Shack in 1980...8 replies | 305 view(s)
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7th October 2018, 23:04If your radio could receive the entire radio spectrum simultaneously, I think you should not expect to hear several broadcasts at the same time....23 replies | 760 view(s)
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7th October 2018, 22:11BradtheRad replied to a thread LBO-514A Oscilloscope no TRACE in Service Manuals, Requests, Repair TipsCombined your symptoms suggest some kind of improper connection between hi-voltage generator and one or two horizontal plates (or else the horizontal...3 replies | 233 view(s)
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7th October 2018, 20:52This suggests your load takes DC. .33F may be sufficient to provide DC voltage @110 W for 1/4 second. Say for a load taking 55VDC @ 2A. However...7 replies | 246 view(s)
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7th October 2018, 20:291. It is possible to receive magnetic or electromagnetic transmissions in the audio range, and listen to them without demodulating. You only need to...23 replies | 760 view(s)
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7th October 2018, 17:58BradtheRad replied to a thread LBO-514A Oscilloscope no TRACE in Service Manuals, Requests, Repair TipsYour high voltage measurements sound about right. Do you see both +250 and -250v? The beam gets a negative polarity. To see the dotted line at...3 replies | 233 view(s)
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