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  1. Merlin3189

    20A CB not activating

    Can I ask you to clarify what you have and what you want? So far you seem to have a 120V generator (petrol/diesel?) capable of supplying 20A (ie. 2.4kW) and having a 20A CB. From this you want to power a 3kW motor rated at 48V 62A . Is the generator AC? Is the motor DC or single phase AC...
  2. Merlin3189

    Pipelining and modified datapath

    You probably need to think about how a ripple adder works (or look it up.) After the data inputs are valid, how long before the Co from the first adder is valid? For the second adder, are ALL its inputs valid at the same time as the first adder? So when do they become valid? And when do its...
  3. Merlin3189

    Changing Signal Frequency And Frequency Overtones Respectively

    Points taken peleg. It just shows that I'm a technician rather than an artist, and I hadn't even thought about squeaky gate music;) I had thought with lots of processing power one could mimic the tonal quality of any instrument, but what I forgot is the way a player can vary the tonal quality...
  4. Merlin3189

    C program .cpp file encryption

    As BobK said, you can spot blocks of ASCII chars in an .exe file, but even a simple transformation like inverting the bits of every char can make them v.difficult to find.
  5. Merlin3189

    Changing Signal Frequency And Frequency Overtones Respectively

    Ooops! I see others have posted while I was writing and they have made me realise that my idea is much too simple anyway. Each string may be producing half a dozen different notes, so I'd need not 6 PLLs, but more like 36 or more. So you'd definitely be better off going for an electronic...
  6. Merlin3189

    Changing Signal Frequency And Frequency Overtones Respectively

    I wonder if a PLL tone decoder (something like NE567) set to the nominal frequency of each string and with the output gating or switching an oscillator at the exact nominal frequency would work? A tone near a nominal frequency would cause that PLL to lock on and the oscillator generate the...
  7. Merlin3189

    Pulse transformer

    Do you just make sure the output circuit has a low enough resistance and put a low resistor in parallel if it hasn't?
  8. Merlin3189

    AC Diode

    I guess the OP diagram is slightly wrong. It just shows the location and point of connection of the LEDs. The other end of the LED must be ground. No problem, except the LED may not like AC without a diode. There are two bits of info, but they don't have to be manual 0/1 and timer 0/1, so how...
  9. Merlin3189

    Does clock pulsewidth affect the 4017 ?

    No trouble. Sorry I didn't understand what you were asking.
  10. Merlin3189

    Does clock pulsewidth affect the 4017 ?

    But you have the wrong answer! If you look at the data sheet page 5 you will see the minimum clock pulse is between 30ns and 200ns. If you break these limits, there is no guarantee that the circuit will operate correctly (may give false counts) or at all. The cause may be that bistables...
  11. Merlin3189

    Reduce amperage without reducing voltage. Diodes? [Noob]

    I'm afraid the first people are correct. Your 12V 1A supply will give approximately 12V and will supply UP TO 1Amp depending on the load. If you TRY to take more than 1A, then you may get more than 1A, the voltage may reduce, the power supply may overheat and it may fail. It is not a good...
  12. Merlin3189

    LPF and HPF

    Because that's how OP asked the question. I do suggest that time domain is not a good way to look at filters. As far as I understand it, for a simple RC filter, time constant and corner frequency are just inversely proportional. Large R and small C or small R and large C can have the same...
  13. Merlin3189

    LPF and HPF

    In HPF when τ>>t there is no problem. The changes at HF all take place in times less than τ , so a series capacitor having a low impedance is just what a HPF wants. In LPF when τ>>t , ( ie looking at a time much shorter than the time constant), HF signals which change in times shorter than...
  14. Merlin3189

    Uses of inductors

    1- You don't! Inductors are not used to create magnetic fields in circuitry. They do incidentally create fields, (often tiny, sometimes not) which we try to keep contained and hidden, but they are used for their circuit properties, not their magnetic field. 2- Inductors have circuit properties...
  15. Merlin3189

    How do I make a signal detector

    I think you may be talking about an absorption wavemeter - basically a tank circuit with a detector (diode or transistor) and sensitive meter. Try looking in an ARRL Handbook or amateur radio UHF book. I haven't got one handy and the only circuit I could find is a bit OTT -...
  16. Merlin3189

    Binary to BCD Converter

    As usual I think you need to say what it is you actually want to do: why do you want to build a circuit to add two 4 bit numbers? What is it you are trying to learn? That would help people see what it is you need to design or build yourself and what bits you can just buy ready made - such as...
  17. Merlin3189

    0/1-10V dimming problem

    You comment in the original post that and, as you note, it is not clear which standards this equipment complies with. In "E1.3, 0 to 10 V Analog Control Specification." the control signal wires should not be connected to the AC mains. The only circuit I have found for the 5TC8424 is...
  18. Merlin3189

    Measuring speed at impact between two objects....

    I just realised you commented earlier, If the object does not have to be something like a raquett ball, you'd be on to a more practical proposition measuring the impact of a couple of trucks (models!) colliding. Maybe even have them on tracks. More space to put stuff, one dimension to...
  19. Merlin3189

    Measuring speed at impact between two objects....

    I'm not sure I have much to contribute beyond agreeing that it sounds a very difficult task, but can I ask why? If your overriding objective is to know this data about the objects, why do you think the best way is to put the sensors inside the balls? It seems like an arbitrary and unnecessary...
  20. Merlin3189

    0/1-10V dimming problem

    I don't see any difference between the Chinese (driver) and German (controller) systems. The Siemens controller simply has the series On/Off switch included, whereas the Chinese driver circuit does not show an On/Off switch. The driver says it can be controlled by 0-10V and the controller says...
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