betwixt
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Yesterday, 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 | 55 view(s)
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Yesterday, 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...12 replies | 469 view(s)
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Yesterday, 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...8 replies | 411 view(s)
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Yesterday, 09:41Without knowing the specification of the original opto it's difficult to know if your replacement was suitable. They are however, very reliable. ...12 replies | 469 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 | 239 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...8 replies | 411 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 | 146 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 | 397 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 | 234 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...8 replies | 411 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 | 384 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 | 236 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 | 236 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...6 replies | 509 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 | 619 view(s)
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13th January 2020, 17:08betwixt replied to a thread HKTS 220 Power Supply board troubleshooting in Service Manuals, Requests, Repair TipsCapacitors are the most likely cause. All the other parts have long lives but capacitors start to degrade from the day they are made, even if not...6 replies | 509 view(s)
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13th January 2020, 16:45I wouldn't recommend that as a solution, it will work sequentially but not exclusively. It will add more loops as the voltage increases rather than...13 replies | 619 view(s)
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13th January 2020, 11:03Its really easy using MCUs but I know you don't like programming them. The simplest way is to get hold of two shift registers, one 'parallel...13 replies | 619 view(s)
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13th January 2020, 10:20A simple summing amplifier is all you need, at it's simplest just join all the signals together! The phasing is exactly what you want, it gives...13 replies | 619 view(s)
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13th January 2020, 10:12betwixt replied to a thread Bootstrapping board for programming the ESP32 in Hobby Circuits and Small Projects ProblemsAs the USB interface draws little current and will already have it's own protection at it's USB side connections, just draw power for it from the 5V...6 replies | 384 view(s)
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13th January 2020, 10:00betwixt replied to a thread Microcontrollers and a lot of advice - PIC , AVR, ARM - Software - Books - Boards in MicrocontrollersYou will find one of the strengths of C is its portability. Obviously some tasks rely on features present in particular processors but the 'glue'...6 replies | 464 view(s)
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12th January 2020, 23:32betwixt replied to a thread Adding CCFL light or LED backlight to a 6 digit/7 segment LCD display in Professional Hardware and Electronics DesignI agree with Klaus. The contrast is largely dependent on the distance light passes through the polarizing layer and back again, if you remove the...3 replies | 272 view(s)
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12th January 2020, 23:27betwixt replied to a thread ZMR330: 3V3 Linear regulator needs diode connected cathode to input voltage? in Elementary Electronic QuestionsTrue - but it does say 'unconditionally stable' and the transient response graphs are labeled to say there is no output capacitor. I can't see any...6 replies | 401 view(s)
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12th January 2020, 23:16You can try but I suspect the impedance matching of T3 stages in parallel might be a problem. 'Disconnecting' the bottom of R4 will still leave the...13 replies | 619 view(s)
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12th January 2020, 09:29Ideally you would use PIN diodes because they are optimized for good conduction and good isolation but there might, stressing that this would be very...13 replies | 619 view(s)
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11th January 2020, 21:06betwixt replied to a thread HKTS 220 Power Supply board troubleshooting in Service Manuals, Requests, Repair TipsThose two new blue upright capacitors are probably unsuitable. I can see you folded the wire to make radial construction fit an axial footprint and...6 replies | 509 view(s)
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11th January 2020, 14:30Where did you put the delay? It has to be AFTER setting the channel but BEFORE starting the ADC conversion. The idea is that inside the PIC there...8 replies | 770 view(s)
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11th January 2020, 09:46The maximum load current is programmable but can't exceed 30mA. I strongly suggest that you keep the current much lower than that and use a pull-up...13 replies | 619 view(s)
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11th January 2020, 09:32betwixt replied to a thread Scraping PCB causes ESD damage to IC? in Elementary Electronic QuestionsI think he's in Cambridge UK, probably even wetter than Massachusetts! In general in the UK, the humidity is high enough that static is rarely a...3 replies | 310 view(s)
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