betwixt
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Today, 18:28betwixt replied to a thread RF Detector not detecting cellular phones in RF, Microwave, Antennas and OpticsMy apologies, it wasn't meant to be condescending. The point I was making is that at high frequencies, because the wavelength is shorter, the...21 replies | 605 view(s)
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Today, 15:39betwixt replied to a thread RF Detector not detecting cellular phones in RF, Microwave, Antennas and OpticsFrom an RF point of view, that is a complete disaster. You really need to understand the concept of wavelengths then closely look at the tracks...21 replies | 605 view(s)
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Today, 15:25We need to see the full code to be sure but as a guess I would say you have the watchdog timer enabled and are not resetting it. The result would be...4 replies | 68 view(s)
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Today, 10:19I think the more important question is where does the 580V come from? But yes, it should be suitable otherwise. With the exception of thermal...2 replies | 92 view(s)
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Today, 10:12betwixt replied to a thread Need to boost 10.5KHz RF transmission distance from 4" to ~25+' in RF, Microwave, Antennas and OpticsThe instructables design will never work efficiently because the current in the loop will be very small. Using whatever method you want to generate...1 replies | 103 view(s)
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Today, 10:03betwixt replied to a thread RF Transmitter - Pulsing sinusoidal wave @ 10.5K Hz. Pulsed every 36ms in RF, Microwave, Antennas and OpticsPIC10F200 is the device number, it is an 8-pin microcontroller (or 6-pin in SMD package) and the smallest and simplest of all the Microchip MCU...3 replies | 154 view(s)
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Today, 00:00betwixt replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsYour workbench is supposed to be grounded via 1M already. ...17 replies | 173 view(s)
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Yesterday, 22:50betwixt replied to a thread Turn on/off hall light with presence detection in Elementary Electronic QuestionsRFID fits all the requirements. All RFID tags have unique serial numbers which you can read so including or excluding a tag at point of entry is just...3 replies | 95 view(s)
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Yesterday, 22:37betwixt replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsLook at it this way: You make an all metal conductive floor and charge it up to 100KV, on it you place a workbench and on the workbench you place...17 replies | 173 view(s)
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Yesterday, 14:56betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersI'm not sure about the flash, you would have to look closely at the ESP8266 data sheet to see if the timing and page layout is compatible. The one on...60 replies | 1675 view(s)
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Yesterday, 10:12betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersBeing practical, I would first try some pre-assembled ESP8266 boards at high temperature. Yes, that crystal will work but the chances are one very...60 replies | 1675 view(s)
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15th February 2019, 16:51betwixt replied to a thread [SOLVED] Thermal sensor of a FAN cooler: Needed to identify in Service Manuals, Requests, Repair TipsThe web site is http://www.tayao.com.tw but I can't see that exact model listed. Their catalog is a 17Mb download which would take ages here on my...2 replies | 184 view(s)
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15th February 2019, 15:45betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersTrimmers are relatively expensive and require manual adjustment using a DVM to monitor the voltage. If it is necessary to cater for both batteries...60 replies | 1675 view(s)
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15th February 2019, 10:25betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersYou probably don't need the potentiometers, the values are predictable so you should be able to use fixed resistors. I note you have no over-current...60 replies | 1675 view(s)
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15th February 2019, 10:15It is quite likely the same device but pre-loaded in the factory with a specific program for Yamaha. Microchip provide a service where they provide...2 replies | 106 view(s)
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15th February 2019, 10:03venkates2218, I think your problem is not understanding how triacs and SCRs work. Think of them as a switch you turn ON with a pulse at any time...19 replies | 1303 view(s)
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14th February 2019, 22:16Easyrider83 is being a bit harsh (and does not have the ability to ban users!). His comment is quite right though, it is very bad practice to add...7 replies | 180 view(s)
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14th February 2019, 12:52betwixt replied to a thread Anyone please help identify what component is this with t4N marking code? in Service Manuals, Requests, Repair TipsThe only component in SOT23 package with 4N as it's code that I can find is a transistor L2SC4083. It is described as an audio transistor but I...2 replies | 293 view(s)
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13th February 2019, 21:57Most filters are designed for smaller signals but there is no reason why you can't attenuate before the filter and amplify again afterwards. With...17 replies | 341 view(s)
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13th February 2019, 15:39Maybe: https://www.analog.com/media/en/reference-design-documentation/design-notes/dn016f.pdf with a tuned clock oscillator would work. Cut off is...17 replies | 341 view(s)
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12th February 2019, 22:24betwixt replied to a thread Circuit to detect presence of a single RF frequency ? in RF, Microwave, Antennas and OpticsUse a PLL and connect the LED to the lock indicator. By changing the VCO components you can set the center frequency and by changing the loop...5 replies | 285 view(s)
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12th February 2019, 22:18By current probe what exactly do you mean? You can add a resistor in series with the source and measure the voltage drop across it then multiply by...3 replies | 383 view(s)
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12th February 2019, 09:15Code without a DS1302 is probably easier than code with it, especially if you are not familiar with it's quirky bi-directional data pin. Having said...4 replies | 143 view(s)
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12th February 2019, 00:16betwixt replied to a thread Open collector output arduino with led with PLC inputs problem in Hobby Circuits and Small Projects ProblemsTwo potential issues: 1. the 'low' level at the PLC input cannot go lower than VCEsat + diode Vf. A Schottky diode would be more appropriate than a...3 replies | 128 view(s)
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11th February 2019, 23:09betwixt replied to a thread RF Transmitter - Pulsing sinusoidal wave @ 10.5K Hz. Pulsed every 36ms in RF, Microwave, Antennas and OpticsTo use a 556 instead of two 555s, wire it exactly the same but use the pin names of the two 555s rather than the pin numbers. As long as you match...3 replies | 154 view(s)
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11th February 2019, 22:53betwixt replied to a thread Power transformer monitoring device in Professional Hardware and Electronics DesignInfra red will make it very complicated. A 'contact' sensor is one you can glue or clip to the outside surface of the transformer without any...21 replies | 599 view(s)
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11th February 2019, 22:50betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersESP8266-01 modules, the postage stamp size ones with internal antenna will reach 75m easily unless there is something shielding the signal. They can...60 replies | 1675 view(s)
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11th February 2019, 10:55betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersAll SMPS need inductors but they are small and inexpensive. I use four 2A 12V regulators at full load 24hrs a day on an Al heatsink inside a box...60 replies | 1675 view(s)
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11th February 2019, 10:21betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersWhy use a "Low Drop Out" regulator at all when you have such a large voltage to drop? A cheap switch mode regulator will be FAR more efficient and...60 replies | 1675 view(s)
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11th February 2019, 10:14I think we need to see a little more code to make a diagnosis! Brian.3 replies | 169 view(s)
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