betwixt
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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. ...16 replies | 135 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...2 replies | 57 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...16 replies | 135 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...58 replies | 1622 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...58 replies | 1622 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 | 153 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...58 replies | 1622 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...58 replies | 1622 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 | 103 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 | 1298 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 | 176 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 | 290 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 | 335 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 | 335 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 | 284 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 | 356 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 | 139 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 | 126 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...2 replies | 124 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 | 598 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...58 replies | 1622 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...58 replies | 1622 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...58 replies | 1622 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 | 167 view(s)
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10th February 2019, 10:15betwixt replied to a thread Power transformer monitoring device in Professional Hardware and Electronics DesignOpen circuit high-impedance inputs will sense the presence of voltage by capacitive coupling but not indicate whether an open circuit has occurred....21 replies | 598 view(s)
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9th February 2019, 22:17betwixt replied to a thread Power transformer monitoring device in Professional Hardware and Electronics DesignAssuming you have some money allocated to the task, I would suggest a simple SMS system using a cell network SIM adapter along with a temperature...21 replies | 598 view(s)
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9th February 2019, 10:18If that is the same CL100, it can probably be replaced with a ULN2803A but there are factors to watch for: 1. ULN2803A has darlington transistors so...3 replies | 120 view(s)
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9th February 2019, 10:09betwixt replied to a thread Surge modules containg MOV and GDT in series...how to test the MOV for leakage currnt in Elementary Electronic QuestionsStill a little confused: what 'blows' if the current is limited to say 1mA? I seem to remember this topic was discussed so time ago and the...4 replies | 221 view(s)
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9th February 2019, 00:33Mattylad replied to a thread CADSTAR help needed with documentation symbols in PCB Routing Schematic Layout software and SimulationYes, ISTR You can do this depending upon what version CADSTAR you use. There are documentation attributes that can be made, then you place that...4 replies | 446 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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