betwixt
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Today, 17:02betwixt replied to a thread MOC3020/BTA41 circuit problem in Hobby Circuits and Small Projects ProblemsTwo points: R4 value looks too low, it is only there to ensure the gate has some leakage current when the output of the MOC3020 is high impedance, I...1 replies | 60 view(s)
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Today, 09:56It might work as a strong magnet detector but never as a sensitive metal detector! Metal detectors work by measuring the effect the metal has on a...1 replies | 171 view(s)
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8th December 2019, 14:29Does your application permit charging one battery at a time? With some MCU intervention and some current steering it is possible to charge one at a...13 replies | 436 view(s)
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8th December 2019, 12:49There is a clue in the MOSFET symbol about that! I can't understand why you need the 15V. If it is to charge the batteries you can't do it while...13 replies | 436 view(s)
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8th December 2019, 12:05Doesn't look at all right to me. I'm not sure what any of the circuit really does. D2 seems to have no purpose at all. If the DC-DC converter is to...13 replies | 436 view(s)
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6th December 2019, 17:09I understand that Klaus but it doesn't increase 10 bits to 12 bits, it just multiplies the result by 4, the LSB will always be zero. The ADC is...6 replies | 293 view(s)
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6th December 2019, 14:58... and what is the point in multiplying the result by 4? It is still a 10-bit value with zeroes at the end. It may be stored with extra bits but...6 replies | 293 view(s)
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6th December 2019, 09:47Yes, but with the risk of damaging the meter and possibly the IC at higher signal levels. It isn't a safe strategy. A better approach if you want to...13 replies | 498 view(s)
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5th December 2019, 21:55If you add a capacitor at the output of the internal amplifier it may go unstable. Check the data sheet for the AD83xx device you choose, there is...13 replies | 498 view(s)
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5th December 2019, 20:32It has a built in voltage amplifier so all you have to do is add a series potentiometer to limit the meter current. You would need a reference to...13 replies | 498 view(s)
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5th December 2019, 17:13If you use a 100uA meter you can probably drive it directly from the AD83xx. Brian.13 replies | 498 view(s)
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5th December 2019, 09:53betwixt replied to a thread How to create a voltage selector circuit in Hobby Circuits and Small Projects ProblemsI thnk a better topology is to feed your voltage to all the comparators in parallel but set a different threshold for each one. The will give you a...6 replies | 311 view(s)
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4th December 2019, 16:29betwixt replied to a thread VU Meter only with 1LED (PWM) no IC except for OPAMP in Hobby Circuits and Small Projects ProblemsYou can't use the outputs of comparators directly because all you get is an on/off indication of the instantaneous level. You would see the output...6 replies | 272 view(s)
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2nd December 2019, 17:05betwixt replied to a thread VU Meter only with 1LED (PWM) no IC except for OPAMP in Hobby Circuits and Small Projects ProblemsNot PWM, what you need is an op-amp as a gain stage, a rectifier (either diode or better still an op-amp based precision rectifier) to give you a DC...6 replies | 272 view(s)
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2nd December 2019, 16:56betwixt replied to a thread Simple 50R I/O RF attenuator (1-30MHz) in RF, Microwave, Antennas and OpticsJust a thought - it is possible to use pre-set potentiometers with plastic center 'screws', either a slot or hex hole? You won't get perfect...14 replies | 471 view(s)
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1st December 2019, 19:48betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsBased on what we have already said, Carbon dioxide resistors would be best but you might have trouble soldering to them. :) Really, the snubber...33 replies | 1335 view(s)
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30th November 2019, 09:59They are internally connected together through a copper loop so they should measure as shorted. The load current (or a proportion of it) passes...2 replies | 230 view(s)
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29th November 2019, 16:30A cheaper alternative might be a low-Q inductance in series with the incoming power. Something like a 50 - 100uH choke with a ~22 Ohm resistor...7 replies | 367 view(s)
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29th November 2019, 16:26Volatile would be a hint to the compiler to re-read the variable because it could have been changed by the ISR. For example, if your main code was...2 replies | 210 view(s)
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29th November 2019, 11:46Most components are rated to handle higher current for brief periods so I doubt any damage would occur in any case. There are methods to limit the...7 replies | 367 view(s)
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29th November 2019, 09:56... and your thermistor tries to drop 2.5 * 10 = 25V as well. First explain what you mean by "it produces sparks" as this is nothing to do with...7 replies | 367 view(s)
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29th November 2019, 00:35betwixt replied to a thread Building Blocks on an FM Band Receiver in RF, Microwave, Antennas and OpticsAs per FvM, don't confuse FM and AM bandwidth requirements. The deviation of standard FM broadcasts is far wider than the bandwidth of normal 455KHz...7 replies | 389 view(s)
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28th November 2019, 11:06betwixt replied to a thread Building Blocks on an FM Band Receiver in RF, Microwave, Antennas and OpticsBefore going further - when you say "FM Band" you seem to be referring to the domestic VHF broadcast band (~87MHz to 108MHz) where relatively wide...7 replies | 389 view(s)
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28th November 2019, 10:59betwixt replied to a thread Converting AF oscillator to use discrete components in Analog Circuit DesignI'm not sure Brad's schematic is a true Wien-Bridge design as it uses different RC values in the series and shunt arms of the feedback loop and it...6 replies | 520 view(s)
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25th November 2019, 22:19You are quite right to correct me FvM - put my mistakes down to old age. They say your memory goes first ...... and I can't remember what comes...15 replies | 818 view(s)
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25th November 2019, 14:34betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsPerhaps they need one of these: https://www.ttvjaudio.com/The-Ultimate-Electrostatic-Headphone-Set-up-p/hif1230008.htm Thankfully it has free...33 replies | 1335 view(s)
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25th November 2019, 14:22First thing to check is whether you really have a controllable volume at all. There are three type of TDA7052, the original with no letter at the...6 replies | 483 view(s)
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25th November 2019, 10:29betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsI do not doubt any of the technical explanations about diode recovery time and how to snub the spike but I do have reservations about how relevant it...33 replies | 1335 view(s)
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25th November 2019, 10:07Symmetry - 32 points in 45 degrees means (360/45)*32 = 256 points in total. An average of a little over 1 degree per point but also a convenient...15 replies | 818 view(s)
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24th November 2019, 13:05betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsNot necessarily, it may work the same way as some 'thermostatic mixer taps' with a constant heat source but motorized mixer valve. Brian.28 replies | 1281 view(s)
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