betwixt
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Yesterday, 22:44betwixt replied to a thread RC5 Remote Controlled Switch Board - AT89C2051 to PIC Based in MicrocontrollersIt is more likely the PIC itself will draw around 5mA but you have to be careful about the current available on each IO pin AND the total available...3 replies | 133 view(s)
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Yesterday, 22:24betwixt replied to a thread Fractional N Synthesizer - Dual or Multi-Modulus Divider in Analog Integrated Circuit (IC) Design, Layout and FabricationAs long as your loop filter has long enough time constant you can switch modulus 'on the fly' to produce intermediate division ratios. You don't...5 replies | 179 view(s)
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Yesterday, 22:17betwixt replied to a thread [SOLVED] Star topology chipset for long range (high power) comms in RF, Microwave, Antennas and OpticsHopefully your microwave oven doesn't radiate 'outside the box' though! Brian.5 replies | 401 view(s)
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Yesterday, 22:13betwixt replied to a thread Accurate mains zero cross detector circuit without optocoupler in Analog Circuit DesignI was actually thinking of connecting 'L' to one comparator input and 'N' to the other so it forces the polarity to reverse and if both inputs are...11 replies | 268 view(s)
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Yesterday, 11:11betwixt replied to a thread RC5 Remote Controlled Switch Board - AT89C2051 to PIC Based in MicrocontrollersI suspect the schematic has some errors. I think the BC639 is supposed to be a 5V regulator for the IR receiver (possibly the MCU as well) but it...3 replies | 133 view(s)
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Yesterday, 10:58betwixt replied to a thread Accurate mains zero cross detector circuit without optocoupler in Analog Circuit DesignYou can do it with one comparator: feed a portion of L and N to the comparator inputs, the output will go high or low as the line polarity changes....11 replies | 268 view(s)
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27th January 2020, 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...31 replies | 869 view(s)
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27th January 2020, 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 | 171 view(s)
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27th January 2020, 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...31 replies | 869 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 | 279 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 | 510 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...31 replies | 869 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 | 527 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 | 713 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 | 601 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 | 248 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 | 601 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 | 789 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 | 364 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 | 713 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...31 replies | 869 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 | 283 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...31 replies | 869 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 | 361 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 | 510 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 | 1160 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 | 1160 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 | 1160 view(s)
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