betwixt
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Yesterday, 22:53The resistor and LED seem OK but what is the supply voltage (VDD) to the PIC. It needs to be a little higher than the LED needs to allow for some...7 replies | 208 view(s)
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Yesterday, 15:37Are you sure? 1 << (twint) shifts a '1' left by '(twint)' times, it creates a value but does it change the contents of a register? Brian.6 replies | 188 view(s)
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Yesterday, 14:16betwixt replied to a thread Measuring voltage drop across a diode in a switching circuit in Elementary Electronic QuestionsSo if you did this: (forgive the crude graphics) +8V ------ Diode ------- (no connection) 0V ---------------------------------------- And you...6 replies | 217 view(s)
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Yesterday, 09:52betwixt replied to a thread Measuring voltage drop across a diode in a switching circuit in Elementary Electronic QuestionsOnly when the diode is conducting and passing enough current. If the voltage can't drop below 7.7V after the diodes it probably means there is...6 replies | 217 view(s)
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23rd May 2020, 21:33betwixt replied to a thread Variable Resistor clamping and output behaviour for LM2596-ADJ in Power ElectronicsI've never seen a regulator that takes it's feedback from the input voltage! I suspect R36 should go to ground instead of the input. To get the...4 replies | 196 view(s)
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23rd May 2020, 08:41betwixt replied to a thread Will a filter block this waveform? in Hobby Circuits and Small Projects ProblemsI think the bottom line is this: If you want a clean 40MHz signal it is best to generate one as near a sine wave as possible then use minimal...25 replies | 475 view(s)
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23rd May 2020, 08:29That suggests you are becoming part of the signal path. Can you check that the PSU you are using really has a ground connection. There should be one...17 replies | 505 view(s)
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22nd May 2020, 22:51Only that there is no frequency modulation on the carrier. When receiving in CW mode you probably wouldn't hear very low frequencies because of the...17 replies | 505 view(s)
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22nd May 2020, 22:42You are not noticing the resistor symbols on the diagram. The pull-up and pull-down are not direct connections to VDD or VSS, they enable a weak...2 replies | 104 view(s)
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22nd May 2020, 18:59betwixt replied to a thread Will a filter block this waveform? in Hobby Circuits and Small Projects ProblemsNot necessarily, but probably. If the module produced a pure sine wave output it would not have any harmonics. A sine wave is a single frequency. If...25 replies | 475 view(s)
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22nd May 2020, 18:49betwixt replied to a thread RFID Transponder transmission and reception working in RF, Microwave, Antennas and OpticsA bit over simplified but this will give you the general idea: In RFID systems, the transmitter sends pulses at the chosen frequency, it also...1 replies | 91 view(s)
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22nd May 2020, 18:34betwixt replied to a thread Will a filter block this waveform? in Hobby Circuits and Small Projects ProblemsDoes not compute Will Robinson. (with apologies to 'Lost in space' fans). A crystal oscillator generally can't be used for FM transmission. I'm...25 replies | 475 view(s)
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22nd May 2020, 14:46It is a pointer, usually to a structure member. Brian.12 replies | 271 view(s)
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22nd May 2020, 14:07You sent us three fragments of mystery code with only one comment between them. We don't stand a chance of working out what is wrong if we don't...1 replies | 121 view(s)
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22nd May 2020, 14:02Standard C language. The '|' means logic OR. The '=' means 'becomes' in this context. '|=' means the left value becomes itself OR'ed with the...12 replies | 271 view(s)
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22nd May 2020, 11:57Sounds like a ground hum loop to me then. There is a difference in voltage between your audio input ground and the LM317 ground. You should have a...17 replies | 505 view(s)
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20th May 2020, 21:56betwixt replied to a thread Dont need a super accurate, super high bandwidth In Amp... in Analog Circuit DesignCan't you just scale the two voltages and feed them differentially to the two amps inputs, one with low gain (or unity) to give the difference and...6 replies | 274 view(s)
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20th May 2020, 20:31My thoughts exactly FvM. That and because the same device running as a high power oscillator has to work in linear mode as well. Even the idea of...12 replies | 455 view(s)
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20th May 2020, 18:08betwixt replied to a thread Problem with current loss with increasing length of wire in Hobby Circuits and Small Projects ProblemsThe only option is to use thicker wires I'm afraid. The voltage drop is caused by the resistance of the wire (Voltage drop = Current * Wire...7 replies | 483 view(s)
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20th May 2020, 11:57You are getting the idea! The best you could achieve with the present circuit is a 50% reduction in power usage because as you now realize, the...12 replies | 455 view(s)
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20th May 2020, 08:48Don't let me stop you trying them but I think you will be disappointed. They are SMPS rectifiers, intended for pulsed high current at relatively low...12 replies | 455 view(s)
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19th May 2020, 20:48betwixt replied to a thread Help identifying some parts in Hobby Circuits and Small Projects ProblemsLooks to have a capacitor across two pins and another capacitor across the other two pins. I would guess this is a small SMPS board and the part is a...7 replies | 280 view(s)
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19th May 2020, 14:58The TMR6-0523 can only deliver 200mA. You do not say what your 'lot of audio amplifiers' consist of, do they draw any additional start-up current to...16 replies | 454 view(s)
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19th May 2020, 11:12The minimum turn on and turn off times of the diodes added together must be less than 1 cycle at 7MHz (142nS) for it to work at all and it should...12 replies | 455 view(s)
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19th May 2020, 09:44Even power Schottky diodes are not capable of switching hard on and off at 7MHz, they will work but be inefficient. You could parallel lots of...12 replies | 455 view(s)
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19th May 2020, 00:00I don't think that will work. You won't find power rated diodes that work at 7MHz and I'm pretty sure you will need to provide equal modulation...12 replies | 455 view(s)
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