betwixt
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Yesterday, 23:12OSCCAL only adjusts the oscillator slightly and it won't stop your code running even with silly values in it. If you are seeing a misbehaving...3 replies | 113 view(s)
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Yesterday, 23:02I would update to v2.10, it may have corrections or better support for that device. As far as I know, just updating/replacing the compiler with the...5 replies | 128 view(s)
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Yesterday, 19:05betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects ProblemsLook closely at the power supply schematic - the '0' of the 15-0-15 is connected to the ground point. It has half wave rectifiers to the positive and...13 replies | 301 view(s)
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Yesterday, 17:28For PWM you need one timer (TMR2) to provide the start time for each pulse but you do not need any interrupts. Basically it works by clocking a...5 replies | 128 view(s)
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Yesterday, 15:14Do you really want to check the ADC output is > 10? By left justifying the ADC result and using ADRESH you are ignoring the two least significant...5 replies | 128 view(s)
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Yesterday, 15:03betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects ProblemsThe virtual ground or supply mid-rail must be there, otherwise that point in the circuit will float according to the current drawn by each half of...13 replies | 301 view(s)
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Yesterday, 14:53Sounds like something has reformatted the source code. MPLAB reserves the first location on a line for labels and needs at least one space before an...3 replies | 113 view(s)
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Yesterday, 14:48betwixt replied to a thread Dimming the MP2489 right down to zero (Buck LED driver) in Power ElectronicsI don't understand - if you use PWM you can take it down to zero or any step up to full brightness. I think the references to 1.25V are because...6 replies | 257 view(s)
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Yesterday, 10:39betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects ProblemsYou have to understand that the output of each channel is a voltage referenced to the zero voltage (virtual ground) point. All the output current...13 replies | 301 view(s)
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Yesterday, 09:00betwixt replied to a thread Dimming the MP2489 right down to zero (Buck LED driver) in Power ElectronicsI don't read it that way. That device has analog dimming with the level set by the voltage on the EN/DIM pin. Read 'EN' as digital enable and 'DIM'...6 replies | 257 view(s)
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21st September 2019, 20:37betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects ProblemsYou should keep C309 and C310 as they are but remove everything before them. The bass will indeed roll off at very low frequencies but I doubt...13 replies | 301 view(s)
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21st September 2019, 14:54betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects Problems1. about 13mA plus backwards leakage in the regulators (= small) will flow back to the PSU so it would be best to remove the regulators and the...13 replies | 301 view(s)
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21st September 2019, 09:19If the LCD only has 4 data lines connected to the PIC it is a 4-bit interface, if it has 8 data lines connected it is an 8-bit interface. Note that...5 replies | 198 view(s)
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20th September 2019, 22:04betwixt replied to a thread Beckman Industrial 9020 - Poor focus with no adjustment in Service Manuals, Requests, Repair TipsTo some of us those are quite low voltages, only 2KV! Seriously, switch it off first and give it a minute or two to discharge capacitors then just...6 replies | 287 view(s)
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18th September 2019, 14:48betwixt replied to a thread Beckman Industrial 9020 - Poor focus with no adjustment in Service Manuals, Requests, Repair TipsYou almost certainly have an open circuit resistor somewhere around the CRT controls. Excessive brightness may also cause the focus defect, it may be...6 replies | 287 view(s)
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18th September 2019, 14:29betwixt replied to a thread Measuring current with ESP32 and Seeed board in IoT - Internet of ThingsI think you probably want full scale reading to be 3.3V, not 5V as you will not be able to measure greater than 3.3V anyway. However, a more...8 replies | 302 view(s)
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17th September 2019, 17:51betwixt replied to a thread Measuring current with ESP32 and Seeed board in IoT - Internet of ThingsIf I understand the original post - the MEASUREMENT is for the load current range up to about 5A but the load may have a brief surge much higher than...8 replies | 302 view(s)
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17th September 2019, 08:45betwixt replied to a thread Change colors of liquid crystal display in Hobby Circuits and Small Projects ProblemsI'm getting confused. Are you trying to produce different hues by rotating the polarizer? You may be able to adjust the shading a little - with the...5 replies | 495 view(s)
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16th September 2019, 11:00From the data sheet: which implies it has an analog frequency discriminator. That means it cannot distinguish signals between two simultaneous...2 replies | 1187 view(s)
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14th September 2019, 13:17betwixt replied to a thread Dimming the MP2489 right down to zero (Buck LED driver) in Power ElectronicsIf I understand the data sheet, the input is always analog but the voltage range is limited to the internal Vref. It gives you the option of...6 replies | 257 view(s)
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14th September 2019, 09:22I think that should win a prize for the most convoluted and un-commented code ever written to do a simple task. When writing a program like that you...3 replies | 229 view(s)
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13th September 2019, 08:51We have no idea what size the pressure gauge is but if we assume it is a standard rotary type with a moving pointer, my approach would be to remove...3 replies | 279 view(s)
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12th September 2019, 22:02The data sheet for the 2N4401 says it should typically drop 0.75V between collector and emitter pins when passing 500mA but you need to give it 50mA...2 replies | 390 view(s)
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12th September 2019, 20:23betwixt replied to a thread Operating four Tx-Rx pairs in close proximity in Hobby Circuits and Small Projects ProblemsI use sequential addressable transmitters with active time of only a few mS, faster than a HT12 can send a single code. Given their close...7 replies | 313 view(s)
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11th September 2019, 09:02betwixt replied to a thread [SOLVED] PIC16F877A controlled 74HC595 by serial command in MicrocontrollersI cannot use Proteus but looking at the code it seems you overflow the receive buffer after a few characters have arrived fro the USART. You usechar...3 replies | 433 view(s)
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11th September 2019, 08:47Almost certainly yes. However, if you use the "lsblk -fs" instead it will also tell you which type of filing system is on the partitions. The...3 replies | 598 view(s)
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10th September 2019, 21:04Windows probably won't help you but if you open a terminal window in Linux try one of these: lsblk -a -fs sudo fdisk -l (lower case 'L') You can...3 replies | 598 view(s)
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9th September 2019, 21:51betwixt replied to a thread Change colors of liquid crystal display in Hobby Circuits and Small Projects ProblemsIt isn't impossible to what you want but it isn't as easy as you imagine. Light falling on the face of the LCD (such as Sunlight) passes through TWO...5 replies | 495 view(s)
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- Retired senior engineer for a test equipment company but still very busy!
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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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