betwixt
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Today, 08:20betwixt replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and Interfacing(15V - 1.6V)/12000 = 0.0011A so all 8 LEDs turned on at once will pass ~9mA and combined power dissipation of all LEDs and their series resistors...36 replies | 400 view(s)
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Yesterday, 21:31Ferrite beads will have almost no effect at low frequencies, they don't really do anything useful until 100s of KHz and higher. I'm not sure where...28 replies | 518 view(s)
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Yesterday, 21:06betwixt replied to a thread Every few Hours clock running fast rtc1307 in Hobby Circuits and Small Projects ProblemsDo what Klaus suggests first. If it is just the clock running fast, the problem is the crystal (or external clock if you are using one) is too high...2 replies | 48 view(s)
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Yesterday, 21:00betwixt replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and InterfacingMy point about LED PIV is this: If the solenoid is ON, the output pins of the 2803 will be close to zero and about (VCC -Vf)/470k = 7uA of LED...36 replies | 400 view(s)
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Yesterday, 15:21I agree with Audioguru, tube amps were good but like all technologies, they get superseded with something better. Anything that is 'latest...28 replies | 518 view(s)
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Yesterday, 15:11betwixt replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and Interfacing470K resistors in series with the LEDs will make them seriously dim! The PIV rating of the LEDs will almost certainly be exceeded with 7V (or is it...36 replies | 400 view(s)
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Yesterday, 15:04The circuit will be unreliable because ground will move according to the difference in load current on the two outputs. A better solution is to...3 replies | 66 view(s)
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Yesterday, 11:33Most of the problems were due to under-rated power supplies. You have to remember that in the 1980's consumer electronics boom, the markets were...28 replies | 518 view(s)
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Yesterday, 08:27I have some in stock but they have been collecting dust for 30 years. The last time I saw one in a commercial product was probably in the mid 1980s,...28 replies | 518 view(s)
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23rd June 2019, 16:13betwixt replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and InterfacingSorry, my fingers and brain had a faulty data link. I meant any applied voltage up to the rated voltage should not cause problems. It follows that...36 replies | 400 view(s)
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23rd June 2019, 16:02betwixt replied to a thread Do you know what is likelihood of occurrence of tolerance extremes of L6564? in Power ElectronicsFor a test result distribution you would have to contact the manufacturer but I would imagine they specify slightly wide of all expected results....3 replies | 124 view(s)
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23rd June 2019, 13:17betwixt replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and Interfacing1.5 times the applied voltage is good but anything higher than supply should not burn out. I suspect the problem is due to the combined voltage of...36 replies | 400 view(s)
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23rd June 2019, 09:39The capacitor is just to roll off the high frequency response, there is no point in making it adjustable. If you are getting a continuous tone out...28 replies | 518 view(s)
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23rd June 2019, 09:34To put the energy harvesting in perspective Shanmei, There is a 5kW transmitter about 4Km away from me here transmitting on 880KHz. With a 50m long...6 replies | 187 view(s)
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23rd June 2019, 09:25betwixt replied to a thread [PIC] Need urgent help in switch case in this menu code. in MicrocontrollersIt is your choice but I find the code confusing, I would do it differently: Instead of writing everything "in-line", put the text and the output...1 replies | 78 view(s)
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23rd June 2019, 09:09Works for me, also in the UK. I'm using Firefox 67.03 in Linux. Maybe something your computer or ISP is blocking.... Brian.4 replies | 166 view(s)
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22nd June 2019, 22:36betwixt replied to a thread how to make DP flash every sec in 2-digit 7-segments without separation of track in MicrocontrollersThe PCB only shows one digit. It is how more than one digit is multiplexed that we need to know. Please show us a schematic. Brian.9 replies | 376 view(s)
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22nd June 2019, 22:32Crystal receiver at 1GHz ??? :???: Brian.6 replies | 187 view(s)
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22nd June 2019, 11:05The tone implies you have instability. I last used those devices in the 1980s and I can remember them being difficult to keep stable. They are not...28 replies | 518 view(s)
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22nd June 2019, 09:01betwixt replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsEven with FETs a bipolar NE555 would struggle to produce enough gate current, I doubt a CMOS one would manage at all. The push-pull concept is why I...35 replies | 969 view(s)
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22nd June 2019, 08:551. L/C1 are a resonant circuit, they selectively pick up one frequency of EM waves. The diode rectifies it and C2 acts like a reservoir to store the...6 replies | 187 view(s)
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22nd June 2019, 08:45What kind of 'noise' is it? Background hiss like white noise or something containing regular tones. Note that the TDA2030 is over 30 years old -...28 replies | 518 view(s)
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20th June 2019, 15:32betwixt replied to a thread Grid leak VS Diode detection in regen set, advantages disadvantages in Tubes and RetroYou need to experiment with this, there are no hard rules and designs of this nature are very critical of construction and component values. My...5 replies | 242 view(s)
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20th June 2019, 08:13betwixt replied to a thread how to make DP flash every sec in 2-digit 7-segments without separation of track in MicrocontrollersI was thinking of a different approach. I assume there is a connection from the MCU to the DP in the same was as all the segments. Regardless of what...9 replies | 376 view(s)
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20th June 2019, 08:06If it has a backlight I'm assuming it is an LCD. The most likely reason is the assembly process is slightly distorting the display relative to the...2 replies | 141 view(s)
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19th June 2019, 22:00betwixt replied to a thread how to make DP flash every sec in 2-digit 7-segments without separation of track in MicrocontrollersI think you are right. The DP are on different digits and your code only enables one digit at a time. That means it is impossible to make both DP...9 replies | 376 view(s)
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19th June 2019, 15:28betwixt replied to a thread Grid leak VS Diode detection in regen set, advantages disadvantages in Tubes and RetroFigures 6 & 7 show regenerative rceivers, the first link is to a reflex receiver which is slightly different in operation. Regardless, the control...5 replies | 242 view(s)
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19th June 2019, 11:52betwixt replied to a thread Grid leak VS Diode detection in regen set, advantages disadvantages in Tubes and RetroI doubt you would notice if there was any difference in distortion. Grid-leak works perfectly well, the grid/cathode form a parallel diode anyway. ...5 replies | 242 view(s)
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18th June 2019, 09:00The multimeter and PIC should show the same measurement. How are you measuring the voltage, on the DC range or AC range? You should get about 2.5V...14 replies | 331 view(s)
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15th June 2019, 15:12betwixt replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsA question before moving on: that transformer you are using, does it have a center tap? In other words is it a 12V to 230V type with two primary...35 replies | 969 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.
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