betwixt
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Today, 19:34betwixt replied to a thread Simple overnight charger for 5 x AA batteries in RF, Microwave, Antennas and OpticsNot sure I understand that c_mitra. The resistor dissipation is constant (it is across the regulator output) and the regulator dissipates (Vdrop *...11 replies | 237 view(s)
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Today, 09:41Basically the tuning is the same. Instead of using a capacitor to tune the LC oscillator circuit, a varactor or varicap diode is used. It is a...1 replies | 98 view(s)
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Today, 09:10betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsGlad I made someones day! :) That type of switch is available in several variations. Some have 0-9 (decimal) and some have 0-15 (hexadecimal),...26 replies | 817 view(s)
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Yesterday, 23:45Well.... so far none of them will do what you want! Basic blocks of a radio receiver are: 1. something to select the frequency you want to...24 replies | 476 view(s)
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Yesterday, 22:03I'm still not sure what you expect it to do. Your new schematic might amplify 'something' at very low frequencies if driven from a low impedance....24 replies | 476 view(s)
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Yesterday, 21:52betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsThat is correct. The resistors you mention can be relatively high in value but you must have them. You show the thumbwheel switch as having four...26 replies | 817 view(s)
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Yesterday, 21:37betwixt replied to a thread Simple overnight charger for 5 x AA batteries in RF, Microwave, Antennas and OpticsYes! The regulator and resistor can be thought of as a constant current device that also drops a voltage. That voltage is the one the regulator is...11 replies | 237 view(s)
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Yesterday, 21:30Imagine you have a capacitor charging through a resistor, the voltage gradually rises until it reaches the supply voltage. Now imagine a switch that...24 replies | 476 view(s)
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Yesterday, 16:37The 2N4401 specification has nothing to do with it. You still haven't explained what the circuit is supposed to do. It can be used as an AM...24 replies | 476 view(s)
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Yesterday, 16:17betwixt replied to a thread Simple overnight charger for 5 x AA batteries in RF, Microwave, Antennas and OpticsYou probably want the regulator to have the lower output voltage rather than increase it. The higher it's regulation voltage, the more you need to...11 replies | 237 view(s)
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Yesterday, 08:37betwixt replied to a thread Simple overnight charger for 5 x AA batteries in RF, Microwave, Antennas and OpticsExpanding on the shunt diode trick - you could fit two diodes across each cell. It isn't the best solution of course but as long as the charging...11 replies | 237 view(s)
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Yesterday, 08:29That isn't much of a specification but from what you have told us a 1.2 Ohm resistor is all you need. It will limit the current to 10A maximum and...2 replies | 68 view(s)
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15th October 2018, 14:01betwixt replied to a thread How do I reduce the speed of a 12v children's car? in Elementary Electronic QuestionsYes, exactly the same. The physical position of the pins is what matters, the outside two are the ends of the internal track and the middle one is...54 replies | 2130 view(s)
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14th October 2018, 20:14betwixt replied to a thread Radio RX/RX module without electrolytic capacitors...DALI light dimming interface in Digital communicationVery few use electrolytics. For RF remote control, especially in a noisy power environment, I strongly advise you to use FM and of course to use a...1 replies | 180 view(s)
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14th October 2018, 20:09The earphone/headphone/loudspeaker cannot respond to high frequencies so to some degree it works like a low pass filter already but a proper LPF will...24 replies | 476 view(s)
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14th October 2018, 20:02Many multimeters have thermocouple inputs. The sensor is only the tiny junction at the tip of the probe wires. Placing a blob of heat sink compound...6 replies | 224 view(s)
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14th October 2018, 15:54A reed switch is a reliable and small way to do it. Another way might be to use an oscilloscope type BNC plug, the ones with an extra pin used to...29 replies | 3460 view(s)
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14th October 2018, 13:52betwixt replied to a thread Why are film capacitors (post boost PFC) 800V rated? in Power ElectronicsI suspect it is simply because they are standard parts. It does mention that components are conservatively rated but if they really did have to...7 replies | 223 view(s)
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14th October 2018, 09:01betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsI will help if possible but if you really want to jump in with both feet and make it fully functional, make life easy by buying four-digit...26 replies | 817 view(s)
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13th October 2018, 21:34betwixt replied to a thread Frankling VFO converted to VCO - problems in RF, Microwave, Antennas and OpticsSorry for the delayed reply. We have been hit by storms over the past few days and had no electricity most of the time! My HF transceiver is an Icom...19 replies | 573 view(s)
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13th October 2018, 21:23betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsDoing it that way means you have to replicate the circuit for every digit which makes it very complicated. All this boils down to whether it has...26 replies | 817 view(s)
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13th October 2018, 08:42betwixt replied to a thread How do I reduce the speed of a 12v children's car? in Elementary Electronic QuestionsYou have two options, one is to replace the 10K potentiometer with a 1K one so you get 10 times less adjustment, given that it seems too 'coarse' to...54 replies | 2130 view(s)
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12th October 2018, 17:10betwixt replied to a thread Nostalgia thread, did you work with Selenium rectifiers? in Tubes and RetroI think the last common usage of them was in HV voltage multipliers in early color TV. Inside the "tripler" there would typically be several...6 replies | 380 view(s)
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12th October 2018, 17:05betwixt replied to a thread Frankling VFO converted to VCO - problems in RF, Microwave, Antennas and OpticsMy HF transceiver still uses motors to tune the PA output! Brian.19 replies | 573 view(s)
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12th October 2018, 13:40betwixt replied to a thread Frankling VFO converted to VCO - problems in RF, Microwave, Antennas and OpticsVaractors really benefit when the frequency is controlled in a loop, for example a PLL where mechanical tuning is impossible. Beehive trimmers are...19 replies | 573 view(s)
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12th October 2018, 09:06Opto devices with an internal LED are always current driven and the output is not a controlled resistance. MOC302x devices are opto-triacs with...5 replies | 194 view(s)
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12th October 2018, 08:45betwixt replied to a thread Nostalgia thread, did you work with Selenium rectifiers? in Tubes and RetroSelenium certainly stinks when it burns! I used them back to around the mid 1960's, both as power rectifiers (remember the square blocks with lots...6 replies | 380 view(s)
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10th October 2018, 15:59The 'line' is already a pulsating flash of laser light. Typically, the emitter is a single laser diode pointing at a rotating mirror so the...14 replies | 319 view(s)
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10th October 2018, 14:23betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsWell, if I had to design a functional (as opposed to 'for display purposes only') I would use dedicated multiplexer devices such as the MAX7219 or...26 replies | 817 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
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