BradtheRad
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Today, 05:40BradtheRad replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsYes, you're on track all right. Good going.53 replies | 1794 view(s) -
Yesterday, 06:45BradtheRad replied to a thread Simulation of Wireless Coils-Help Needed in Electromagnetic Design and SimulationInductance is more of a magnetic phenomenon rather than electromagnetic. Mutual inductance is sort of like a transformer where the windings have a...1 replies | 175 view(s)
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Yesterday, 04:54It is possible to run at high rpm with light load. So you don't necessarily need high torque. You can send low current through the motor. That is,...10 replies | 317 view(s)
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10th November 2018, 19:44BradtheRad replied to a thread Pop-ups attempting to link some website on my browser. in General ComputerDid you try Chrome's Reset command (somewhere in its menu)? It clears cookies, history, cache, etc. Perhaps plug-ins. Either all at once or...9 replies | 669 view(s)
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9th November 2018, 06:09BradtheRad replied to a thread Voltage Comparator Design in Hobby Circuits and Small Projects Problems741 output does not get within 2V or so of the bottom supply rail. So it became common to hear that op amps need a bipolar supply (meaning positive...17 replies | 586 view(s)
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8th November 2018, 01:08BradtheRad replied to a thread Mathematical formula of the minimum separations required between two patch antennas? in RF, Microwave, Antennas and OpticsI have a weather forecast system (WeatherDirect) that receives information over the internet. The three units talk by rf communication. The...6 replies | 335 view(s)
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7th November 2018, 04:54BradtheRad replied to a thread need data sheet or info for pixma mp800 printer lcd screen in Service Manuals, Requests, Repair TipsPreceding post is appended to thread.4 replies | 865 view(s)
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3rd November 2018, 21:24BradtheRad replied to a thread Help with achieving minimum load current for SSR for weak loads in Analog Circuit DesignReading the previous post by Klaus, could it be sufficient to send 50 mA pulses of current for just a milli-second per each cycle? That would be less...8 replies | 348 view(s)
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3rd November 2018, 19:35BradtheRad replied to a thread Two OpAmp connected in series in Hobby Circuits and Small Projects ProblemsAlthough certain situations might need two op amps to achieve a similar job, I'm pretty sure your entire task is achievable with a single transistor....4 replies | 171 view(s)
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3rd November 2018, 18:28BradtheRad replied to a thread Sony BVP-3P user manual help in Service Manuals, Requests, Repair TipsYes, the gears need to start and end at a certain position so that a tape-handling cycle can execute properly, then be in position to cycle again. ...13 replies | 1628 view(s)
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3rd November 2018, 17:22BradtheRad replied to a thread Replacing an AC Ni-Cad battery charger with a DC battery charger in Hobby Circuits and Small Projects ProblemsIs it possible the 4.4 VDC supply is in fact rectified 9VAC? So it goes through one diode (or it goes through a full diode bridge, 4 diodes)? And so...17 replies | 1018 view(s)
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3rd November 2018, 06:09BradtheRad replied to a thread Help with achieving minimum load current for SSR for weak loads in Analog Circuit DesignAn ordinary 12 volt relay might pull in at 10V, and release at 7V. If you're lucky then the solid state relay behaves in a similar manner. If so then...8 replies | 348 view(s)
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3rd November 2018, 01:29A capacitor can delay a sinewave if you make an RC integrator (that is, a low-pass filter with capacitor connected across signal wires). If you...11 replies | 329 view(s)
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2nd November 2018, 22:49The inductor needs to be rated to carry higher current than your load. That is, the saturation parameter. The amount might be from 110% to 200%,...5 replies | 224 view(s)
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2nd November 2018, 06:42BradtheRad replied to a thread Help with achieving minimum load current for SSR for weak loads in Analog Circuit DesignThe capacitive drop method has become popular because it is a cheap way to get small current from mains AC. 1 uF is a reasonable value. There's...8 replies | 348 view(s)
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2nd November 2018, 02:59BradtheRad replied to a thread How to make +/- 20V Dual Power Supply from a 64V 360mA LPS D.C Signal in Power ElectronicsSimple step-down converter. The transistor turns on & off, creating an effect similar to a buck converter. If the loads are equal then they...5 replies | 347 view(s)
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30th October 2018, 05:28BradtheRad replied to a thread Pop-ups attempting to link some website on my browser. in General ComputerEach web browser seems to have a different vulnerability which can be exploited. Example, look at your list of browser plug-ins. Delete any which...9 replies | 669 view(s)
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30th October 2018, 05:03Manufacturers create so many different plug designs for devices. I think their purpose is to make it difficult for customers to do anything to make...7 replies | 307 view(s)
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30th October 2018, 03:37Potentiometer scratchiness bothers me most at soft volume, rather than at high volume. Several of my older radios no longer increase volume...10 replies | 372 view(s)
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30th October 2018, 00:56BradtheRad replied to a thread Pop-ups attempting to link some website on my browser. in General ComputerSounds like your computer has a malware called a browser hijacker. It redirects you to advertisements or sites which may covertly try to send more...9 replies | 669 view(s)
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29th October 2018, 04:06BradtheRad replied to a thread Need Help Converting 150,000hz 3.3V 19.38mA DC Square Wave into 20Volt .2A A.C in Analog Circuit DesignYour schematic can be the start of constructing a full H-bridge (as suggested per post #12). The incoming 3.3 VDC pulses are sufficient to...14 replies | 536 view(s)
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28th October 2018, 07:04BradtheRad replied to a thread I need calculate and measure C2, C3,C1 for active inductor in RF, Microwave, Antennas and OpticsLooking at your diagram I confess had the impression you plan to put capacitors in the upper schematic so as to form an active inductor (as modelled...6 replies | 326 view(s)
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27th October 2018, 20:48When a small transistor dissipates this amount it gets hot but it still allows me to hold it between my fingers.4 replies | 201 view(s)
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27th October 2018, 19:13Chemelec's schematics (post #10) have the 4069 invert-gate. Although the 4069 normally changes output state abruptly, the UBE (unbuffered) version...17 replies | 682 view(s)
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27th October 2018, 03:25BradtheRad replied to a thread [SOLVED] what to do with ne555 unused pins in Elementary Electronic Questions555 IC schematic:5 replies | 292 view(s)
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27th October 2018, 03:24This experiment might give an idea... Send a sudden surge of current through one inductor. Watch with a scope for response (either voltage or...2 replies | 180 view(s)
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27th October 2018, 02:35BradtheRad replied to a thread Need Help Converting 150,000hz 3.3V 19.38mA DC Square Wave into 20Volt .2A A.C in Analog Circuit DesignYour incoming signal is 3.3V pulsed DC. It can drive a half-bridge although you need three transistors to provide necessary bias on/off. Your...14 replies | 536 view(s)
About BradtheRad
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