BradtheRad
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Today, 06:38Install a switch in parallel with the resistor. Close the switch to get 100, 200, 600 ohms. Open the switch to get 1k-2k. Of course it's...7 replies | 93 view(s) -
Today, 04:38Example, buck converter with LC smoothing filter at supply input. Notice Ampere draw does not go higher than 240mA. This is compatible with usual...2 replies | 75 view(s)
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Yesterday, 23:28Is this PoE or PoE+ ? The newer version provides more current than the older. You need 10W, and the supply is about 50V, correct? Then you wish...2 replies | 75 view(s)
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Yesterday, 20:39Does the value need to go to zero? Or is it satisfactory to have a range of 1k to 2k? You can do that by putting a resistor in series with just one...7 replies | 93 view(s)
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Yesterday, 06:47BradtheRad replied to a thread How does one learn to read a schematic? (Marshall tube guitar amp) in Tubes and RetroIt's an old-fashioned tube (valve) amplifier. Marshall is a well-reputed brand from that era. Many experts believe tubes are more listenable than...3 replies | 147 view(s)
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Yesterday, 05:17The LC network needs a properly-selected ohmic resistance somewhere. Otherwise it won't do a proper job of shaping a square wave into a sine. Your...2 replies | 190 view(s)
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23rd August 2019, 04:13H-bridge sends full supply power through series LC. Waveform is sine-shaped. Sense resistor automatically detects LC resonant frequency, by detecting...4 replies | 221 view(s)
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22nd August 2019, 14:52BradtheRad replied to a thread Problem with Logitech Audio PCB (No Sound Output) in Hobby Circuits and Small Projects ProblemsI'm looking at the 0V readings at pins 5 through 10, on IC#2. That can't be normal. IC#1 gives 0V only at pin 9 which is labelled ground.34 replies | 1622 view(s)
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22nd August 2019, 05:03Your schematic is common-base operation of a transistor. Its characteristics are: * low input impedance * high output impedance * high gain. By...7 replies | 286 view(s)
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21st August 2019, 12:33BradtheRad replied to a thread Halogen Lamp Limit Resistor? in Service Manuals, Requests, Repair TipsAlthough 10W is calculated dissipation, nevertheless it's wise to make your resistor rated for higher than that. Consider putting several one ohm...15 replies | 452 view(s)
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21st August 2019, 02:37Your query is suitable to post in a regular forum. There it is likely to get replies from our daily regular experts. These group discussions seem...2 replies
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21st August 2019, 02:12BradtheRad replied to a thread Halogen Lamp Limit Resistor? in Service Manuals, Requests, Repair TipsThis article on halogen bulbs points out ways they are different from normal incandescents. (Halogen type has a cycle of filament metal being...15 replies | 452 view(s)
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20th August 2019, 05:02iqbalpiac replied to a thread I am posting dsPIC30f2010 inverter circuits diagrams with PCB proteuse files and HEX in Show your DIYPlease find7 replies | 904 view(s)
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19th August 2019, 13:10BradtheRad replied to a thread Halogen Lamp Limit Resistor? in Service Manuals, Requests, Repair TipsAs Brian says, it's more efficient to pulse the headlight. Nevertheless it's interesting to figure out how to achieve the resistive drop. To send...15 replies | 452 view(s)
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19th August 2019, 03:40BradtheRad replied to a thread Multiple AC inputs relay (light PLC) in Elementary Electronic QuestionsThis can be done by putting resistors inline with the input signals. The weighting proportions are achieved by making differing ohm values. Mix them...5 replies | 226 view(s)
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17th August 2019, 22:32It's an idea worth some experimentation. Or to have a potentiometer choose how much comes from a capacitor and how much from an inductor. This...10 replies | 569 view(s)
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16th August 2019, 22:00BradtheRad replied to a thread High power efficiency oscillator topologies? in RF, Microwave, Antennas and OpticsSorry, I wasn't certain as to what waveform you want. This sine wave oscillator has a resonant current loop based on two capacitors and one inductor....14 replies | 453 view(s)
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16th August 2019, 12:55BradtheRad replied to a thread High power efficiency oscillator topologies? in RF, Microwave, Antennas and OpticsMultivibrator, frequency depends on capacitor value. 6pF yields 130 MHz. Output transition is a few volts. Draws about 1mA from 3V supply. ...14 replies | 453 view(s)
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16th August 2019, 06:45By installing a capacitor between the two sources, rapid zero-crossings are detectable. The capacitor produces spikes. However it may also produce...8 replies | 420 view(s)
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15th August 2019, 12:17I do loadpull for the main amplifier at two points: 1. Just before the peaking amplifier turns on and begins to significantly do "load modulation". ...5 replies | 358 view(s)
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15th August 2019, 07:47Install a resistor between the two sources. One source becomes ground for the other source. Measure voltage across the resistor to read differential...8 replies | 420 view(s)
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15th August 2019, 00:04BradtheRad replied to a thread How to add the outputs of a different voltage double ciruits in Analog Circuit DesignRework one circuit so it outputs negative polarity. Connect your load across the two outputs. This method works if the two ground icons represent a...3 replies | 239 view(s)
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14th August 2019, 07:12By adding an inductor to the capacitor, attenuation is not as severe. Because you don't have a resistor involved. For 1-30 MHz range an inductor...10 replies | 569 view(s)
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14th August 2019, 01:04BradtheRad replied to a thread Difference between Differentiators and Comparators in Elementary Electronic QuestionsA differential detector is the input stage of a comparator. A differentiator performs a calculus function, differentiation. Its the counterpart of...3 replies | 172 view(s)
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13th August 2019, 06:17vivekroy replied to a thread How to increase high frequency output power in RF, Microwave, Antennas and OpticsThe curve that circuitking has shared shows a very wide region of operation. Obtaining matching across such a wide range is quiet difficult....5 replies | 279 view(s)
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13th August 2019, 04:15BradtheRad replied to a thread How to increase high frequency output power in RF, Microwave, Antennas and OpticsCan this be solved by impedance matching? Normally that is associated with the goal to maximize power transfer. Input arrives as a combination of...5 replies | 279 view(s)
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- Born 1953. Some college.
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