betwixt
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Yesterday, 23:40Aside from the danger if the capacitor goes short, I can't see how it works at all. The 1nF capacitor will just charge up, surely you want to feed...30 replies | 743 view(s)
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Yesterday, 09:57A laptop drawing 1.6A at 230V AC..... That is approximately 370W ! You must have a very big lap d123, or at least a very hot one! Brian.4 replies | 130 view(s)
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Yesterday, 00:15There is nothing stopping you using an NE555 and your transistor switch to create a phase control signal. Just wire the '555 in monostable mode and...30 replies | 743 view(s)
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26th January 2020, 22:49betwixt replied to a thread Ramping a reference voltage up from, or down to zero volts, over ~200us in Analog Circuit DesignWhy not just use the PWM signal alone and a buffer at the output (if needed). 200uS is fairly quick for a ramp to go from top/bottom/top using 10...6 replies | 233 view(s)
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26th January 2020, 10:20You got it! The filter is to average the PWM pulses so the voltage across it is proportional to their on/off ratio. If loaded directly, the voltage...8 replies | 492 view(s)
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25th January 2020, 22:29If you break one open you will inevitably find two PCBs, one aluminum backed with several LEDs on it and one conventional board with a bridge...30 replies | 743 view(s)
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25th January 2020, 09:55Another point worth mentioning is the PIC range have Baud rate generators that can hold any 8 or in some cases 16 bit number. They are not confined...11 replies | 505 view(s)
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24th January 2020, 09:57Even with cheap RS422 drivers/receivers (8-pin ICs) you can reach distances of Kilometers quite easily, even at high data speeds. For almost...15 replies | 669 view(s)
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23rd January 2020, 22:24betwixt replied to a thread load sensing circuit/relay in Hobby Circuits and Small Projects ProblemsSituation understood. What you have to consider when using a series transformer is the voltage drop it adds to the wiring. For example, using a...9 replies | 585 view(s)
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23rd January 2020, 21:23betwixt replied to a thread PIC18F micro controller to send and receive atcommand in MicrocontrollersYou should be able to use any UART driver library or write your own. The LOra module uses 115200 Bauds serial protocol so all you have to do is hook...2 replies | 223 view(s)
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23rd January 2020, 21:18betwixt replied to a thread load sensing circuit/relay in Hobby Circuits and Small Projects ProblemsSorry for the delay, I've been busy elsewhere over the past few days. I don't think you need a transformer and optocoupler, both provide isolation...9 replies | 585 view(s)
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23rd January 2020, 21:08betwixt replied to a thread HAM radio topic: EM based design of a 432 MHz high pass with 144 MHz rejection in RF, Microwave, Antennas and OpticsThank you Volker. This is a simple to build but high performing filter that I'm sure many of us will find useful, even in non-contest situations. ...9 replies | 722 view(s)
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23rd January 2020, 20:52betwixt replied to a thread GND For Connector Shielding in Professional Hardware and Electronics DesignWhy are they not ALL connected directly to ground anyway? Brian.5 replies | 342 view(s)
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23rd January 2020, 20:46I would suggest a far similar system: Keep the wiring as it is but instead of using PWM, use a simple two byte serial stream. Byte one to identify...15 replies | 669 view(s)
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23rd January 2020, 10:15A dimmable LED lamp means it has an internal control circuit that recognizes the shape of 'chopped' phase control signals or uses PWM derived from...30 replies | 743 view(s)
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23rd January 2020, 09:52betwixt replied to a thread [SOLVED] MAX232 alternative with more lines in single package in Digital communicationAlmost all the MAX23x and MAX24x interfaces are multi-channel. I think the MAX240 range is your best bet, check the data sheets. The MAX245 has 10...3 replies | 262 view(s)
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22nd January 2020, 22:24Firstly, make sure the GU10 LED bulbs are truly dimmable. Most already have a switching current regulator in them which will interfere with the drive...30 replies | 743 view(s)
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22nd January 2020, 16:12According to the specifications it has Freeview built in. Usually on models like that there is a menu option to select the input mode. "TV" refers...2 replies | 324 view(s)
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21st January 2020, 14:29Away from the remaining circuit it is difficult to be sure but the most likely reason is because R18 and C25 form a filter and without the high input...8 replies | 492 view(s)
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20th January 2020, 23:05betwixt replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsIf you mean this: It isn't correct. The RMS reading of the AC from the transformer will be fine but the DC range will not give an accurate result....17 replies | 1133 view(s)
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20th January 2020, 10:12betwixt replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsWhat exactly are you trying to measure? You cannot measure the 'Amps' because that is what you take FROM the transformer, not what it will just give...17 replies | 1133 view(s)
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19th January 2020, 23:57betwixt replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsProvided you have enough capability to provide the maximum current you need, that is true. Amps represent the load, all you have to do is make sure...17 replies | 1133 view(s)
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19th January 2020, 21:47betwixt replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsYou are not understanding how current ratings work. Firstly, take note of what FvM wrote in post #3, it will work but that kind of transformer is...17 replies | 1133 view(s)
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19th January 2020, 21:33betwixt replied to a thread load sensing circuit/relay in Hobby Circuits and Small Projects ProblemsIn principle your design will work but it has some drawbacks, there is an easier way! The problems are that you drop some of the line voltage in...9 replies | 585 view(s)
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18th January 2020, 23:34betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThis is getting rather complicated and expensive. My initial thoughts if burst control is to be used is a triac fired with a ZCD opto-coupler, in...37 replies | 2128 view(s)
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18th January 2020, 17:44betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThe offset would only occur on the start of a conduction cycle, if you use SCR/Triac switching it will turn itself off accurately anyway. Why use...37 replies | 2128 view(s)
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18th January 2020, 17:40The inverters (NME0505 etc.) take DC in and produce DC out, they are very small, about 10mm x 15mm x 6mm and have four pins. The two output pins are...11 replies | 982 view(s)
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17th January 2020, 21:50betwixt replied to a thread very simple and short inverter circuit in Hobby Circuits and Small Projects ProblemsIt is your video so you should know! In truth, yes it will work but it will be very inefficient and the LED lamp will not light at full...3 replies | 314 view(s)
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