betwixt
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Today, 17:23Comments: You don't start with the LED turned off. Nothing counts the pulses. I suspect you want to configure the INT0 interrupt rather than...1 replies | 51 view(s)
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Yesterday, 20:42betwixt replied to a thread Turn light by usin MOC3021/BT136 and TTP223 Module to turn on 220v lamp in Elementary Electronic QuestionsThe schematic doesn't have any current path through the triac so it can't possibly work. To make an AC capacitive dropper to drive an isolated...3 replies | 118 view(s)
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Yesterday, 20:31betwixt replied to a thread MCP4261 burnt and hot after power on half hour in Elementary Electronic Questionslaoadam, what wwfeldman is suggesting is that the fault is not in the (confusing) schematic you show but due to something connected to the P0W or P1W...8 replies | 155 view(s)
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Yesterday, 12:07betwixt replied to a thread [General] ON/OFF controller IC with retaining its state after power resume in MicrocontrollersEEPROM is by far the easiest method to use. Just read the state when powered up and set the switch accordingly. When the switch setting changes, just...9 replies | 141 view(s)
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Yesterday, 09:37It is an SR latch and it should work with some caveats: 1. The water container must be electrically isolated, no other electrical connections (via...7 replies | 349 view(s)
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18th March 2019, 23:47betwixt replied to a thread Turn light by usin MOC3021/BT136 and TTP223 Module to turn on 220v lamp in Elementary Electronic QuestionsSchematic doesn't make sense I'm afraid - have another go at tracing it. WARNING - a touch sensor wired to a non-isolated 220V AC supply is a...3 replies | 118 view(s)
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18th March 2019, 17:13betwixt replied to a thread Best microcontroller for WPA2 Enterprise connection? in MicrocontrollersI've never tried it but I can't see any reason why the certificate can't be saved to an SD card. It is only a text file. This might give you some...8 replies | 116 view(s)
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18th March 2019, 11:21betwixt replied to a thread Best microcontroller for WPA2 Enterprise connection? in MicrocontrollersI use WROOM32 modules with much larger memory in them than the basic processor. A WROOM32 with a spring socketed development board is a powerful...8 replies | 116 view(s)
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18th March 2019, 09:46betwixt replied to a thread Room Temperature using MCU in Hobby Circuits and Small Projects ProblemsThat depends entirely on the kind of motor and it's power requirements. Tell us more and we will try to help, at the moment we don't know anything...4 replies | 197 view(s)
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18th March 2019, 09:42betwixt replied to a thread Best microcontroller for WPA2 Enterprise connection? in MicrocontrollersWithout knowing how much memory you actually need it's difficult to advise but you could consider ESP32 as an alternative to ESP8266. From the...8 replies | 116 view(s)
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17th March 2019, 13:05betwixt replied to a thread Why is single channel voltage data-logging so expensive? (£96)? in PC Programming and InterfacingThere is a free version of the compiler I use but the full 'PRO' version only costs £50 and it has full debugging and simulation (digital and analog)...8 replies | 758 view(s)
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17th March 2019, 09:57betwixt replied to a thread Why is single channel voltage data-logging so expensive? (£96)? in PC Programming and InterfacingI appreciate your honesty about the software but it really is VERY easy. 1. configure the registers including setting the PWM rate. 2. detect...8 replies | 758 view(s)
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16th March 2019, 21:45betwixt replied to a thread Why is single channel voltage data-logging so expensive? (£96)? in PC Programming and InterfacingI'm not sure exactly what you are trying to record in the log but 'reading every 200uS and store the maximum one every second' after passing through...8 replies | 758 view(s)
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15th March 2019, 09:46betwixt replied to a thread Need a equivalent for microcontroller SST89E516RD in Service Manuals, Requests, Repair TipsFrom the first paragraph of the data sheet: Brian.1 replies | 143 view(s)
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14th March 2019, 13:08You are missing the point. The clock speed only determines how many instructions the 8088 can execute in a given time, the rest of the system has to...11 replies | 242 view(s)
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14th March 2019, 11:03Neazoi, there are two factors at play, one is the propagation delay (time between a transition or control change at the input reaching the output)...11 replies | 242 view(s)
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14th March 2019, 10:01If you mean the 74F573, 74F244 or 74F245 devices, yes in theory if you can find an MCU running at a few GHz clock rate. They are 'Fast' 74 series...11 replies | 242 view(s)
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13th March 2019, 22:15betwixt replied to a thread Error amplifier's output is very low as it controls led driver (Op Amp output) in Power ElectronicsAdding diodes will degrade temperature stability. If you are concerned about near-ground response, why not use a potential divider at the output and...2 replies | 132 view(s)
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13th March 2019, 12:02Just a guess as I don't have any data sheets to hand at the moment - your 'lcd_init' sets the mode as the last step, it should probably be the first...3 replies | 275 view(s)
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12th March 2019, 13:02betwixt replied to a thread Cheap RF 433.92MHz design, PCB track antenna, values of capacitors in RF, Microwave, Antennas and OpticsI would think the 'straight' antenna would work best. Try both but my 'gut' feeling is there is no advantage to the second design. Without a...26 replies | 787 view(s)
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12th March 2019, 11:30betwixt replied to a thread How often do surges happen on the mains? in Elementary Electronic QuestionsZak28 & ArakelTheDragon, Treez is speaking of transients rather than the entire network rising by 20V RMS. Grounding will never stop transients...12 replies | 2100 view(s)
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12th March 2019, 09:40betwixt replied to a thread Use of comparator for sampling repetitive waveforms in Analog Circuit DesignThe clue is in that line. A DAC produces a voltage which is then compared to the sample using a simple comparator, the output tells you whether...4 replies | 153 view(s)
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11th March 2019, 21:16https://www.analog.com/media/en/technical-documentation/data-sheets/ad9834.pdf First hit in Google! Brian.19 replies | 819 view(s)
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11th March 2019, 15:54betwixt replied to a thread Detect Reverse Polarity of Coil in Professional Hardware and Electronics DesignI'm going to expand on what d123 stated. Add a similar coil in line (on the same axis) with the one you want to check. Apply a known signal to the...3 replies | 515 view(s)
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11th March 2019, 10:28betwixt replied to a thread Cheap RF 433.92MHz design, PCB track antenna, values of capacitors in RF, Microwave, Antennas and OpticsThe circuit is identical except for the component values. The 3pF capacitor is equivalent to the 'twist' capacitor I mentioned before. I would...26 replies | 787 view(s)
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