betwixt
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Today, 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...8 replies | 140 view(s)
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Today, 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 | 126 view(s)
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Yesterday, 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...8 replies | 140 view(s)
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Yesterday, 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...1 replies | 115 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...6 replies | 260 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 | 886 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 | 886 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 | 886 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 | 886 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...6 replies | 367 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 | 1989 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 | 1989 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 | 815 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...2 replies | 201 view(s)
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17th January 2020, 14:46It uses voltage monitoring and linear feedback. The principle is to convert the output voltage to a current through the opto-coupler LED. It could...13 replies | 678 view(s)
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17th January 2020, 14:13The easiest way to produce a FIXED negative supply is to use a commercial inverter module. There are many with 5V in and 5V out or with 12V in and...11 replies | 815 view(s)
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17th January 2020, 09:41Without knowing the specification of the original opto it's difficult to know if your replacement was suitable. They are however, very reliable. ...13 replies | 678 view(s)
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16th January 2020, 09:43The advert says it will not enumerate in HID mode, perhaps that is the problem. You might have to 're-flash' it with more suitable code for your...2 replies | 520 view(s)
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16th January 2020, 09:33Simply use two potentiometers, both wired across 0V and supply. That way you have two independent variable voltages with only two components being...11 replies | 815 view(s)
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15th January 2020, 18:06betwixt replied to a thread 80m phase shift SSB transceiver, How does it detect USB/LSB? in RF, Microwave, Antennas and OpticsI think it is DSB so no switching is needed. Brian.1 replies | 193 view(s)
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15th January 2020, 18:04A UART can only send one byte at a time, some have a FIFO buffer that allows more than one byte to be queued for sending but the general principle is...10 replies | 587 view(s)
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15th January 2020, 17:55I agree, and it will work better than a 741. The caveat with NE5532 and NE5534 devices is they have head-to-toe parallel diodes across the inverting...4 replies | 301 view(s)
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15th January 2020, 14:57Suggestion: an analog calculator. One or two voltage inputs and one voltage output. You could implement add, subtract, multiply, divide and...11 replies | 815 view(s)
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14th January 2020, 23:40betwixt replied to a thread Bootstrapping board for programming the ESP32 in Hobby Circuits and Small Projects ProblemsI have attached the schematic for the ESP32 dev board. If you move the parts in the "Micro USB 5V&USB-UART" box to your bootstrap board and make...6 replies | 472 view(s)
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14th January 2020, 17:19RS485 uses only two wires and has a protocol for deciding which direction the bus information is traveling, it also specifies how devices in parallel...4 replies | 323 view(s)
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14th January 2020, 14:39You haven't enabled the MAX489! Tie '/RE' to ground and 'DE' to 5V to enable the receiver and transmitter circuits. You should ideally add a...4 replies | 323 view(s)
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13th January 2020, 22:39betwixt replied to a thread HKTS 220 Power Supply board troubleshooting in Service Manuals, Requests, Repair TipsIt could be. To be honest it is difficult to tell whether capacitors are working unless you monitor for residual signal across them. A good capacitor...7 replies | 703 view(s)
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13th January 2020, 22:31I didn't check accurately and you may be right but it is rather complicated and don't forget that regulators usually pass lower input voltages to...13 replies | 799 view(s)
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