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Type: Posts; User: barry

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    [SOLVED]Closed: Re: Op amp integrator formula

    I think you’re getting your brain tied in a knot. The upper bound for your integration is whatever you want it to be, it has NOTHING to do with the signal, v(t). If your signal is a square wave, that...
  2. Closed: Re: computer parallel port external relay control

    Just do a search for "USB relays" or something like that, and you'll find lots of stuff, like this: https://www.online-devices.com/product-236-4_Channel_Relay,_4_ch_Digital_Inputs,_USB.aspx
  3. Closed: Re: computer parallel port external relay control

    You're close enough, Frank. Fire away. What's your question?

    I'm not really sure what you mean about Microsoft "restrictions". You're free to write whatever drivers you want, or develop whatever...
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    Closed: Re: Circuit with an integrated FLIP FLOP

    This is a mess.

    In "1." you say C goes to 1 when A and B are 1. Then in "3." you say "pin C returns to 1 ONLY when pin A goes from 1 to 0 and then to 1 again and with pin B to 1". These two...
  5. Closed: Re: Is a snubber circuit required with zero-cross optocoupler

    I think it depends on the application. If you've got an inductive load, where current and voltage are 90 degrees out of phase, you might still need a snubber.
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    [SOLVED]Closed: Re: What is the role of this transistor?

    It’s a current litter.
  7. Closed: Re: Force sensitive resistor controlling output voltage

    A constant current driving a varying resistance gives a varying voltage.

    Forgetting about that 50k, when the wiper is near the top of the pot you’ve got 18/110000= 0.16 ma through the wiper; when...
  8. Closed: Re: Force sensitive resistor controlling output voltage

    Your second circuit doesn't make a lot of sense to me. First of all, I think you may damage the FSR with such a high voltage. Secondly, what's the point of the cap on the wiper? Thirdly, why do you...
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    [SOLVED]Closed: Re: Interface Temperature Sensor

    You need to know your sensor's voltage(resistance)/temperature relationship. You don't tell us if it's a thermistor, RTD, thermocouple, diode or what. The manufacturer should provide that information.
  10. Closed: Re: My test pattern is not like should be! Somebody can help me please?

    Congratulations! You are today's winner of the vaguest, most meaningless post!!

    We have absolutely NO idea what you are talking about. Test pattern? On what, you're TV screen? Your front lawn?
    ...
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    Closed: Re: Yamaha DD-50 need help please

    how Old is it? Those sensors do wear out.
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    Closed: Re: MCU Vcc to GND SHORT

    Is it possible you are inadvertently configuring an input pin as an output?
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    Closed: Re: capacitive touch sense switch

    If they are CUSTOM switches, how would anyone besides you know ANYTHING about them???
  14. Closed: Re: Failure mode of aluminium electrolytic capacitor....open cct..not short cct?

    Let me be blunt: your design approach is questionable at best, dangerous at worst. I would never buy a product designed by someone whose philosophy is ‘well, transients don’t happen that often, so...
  15. Closed: Re: Failure mode of aluminium electrolytic capacitor....open cct..not short cct?

    No, i dont agree. If they polymer caps are adequate, then why use an electrolytic? If they're not adequate, then when the electrolytic fails youll have an inadequate circuit.
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    Closed: Re: Dimmer Circuit with Switch Wiring Question

    You actually bought this? It looks like it was assembled by a pre-schooler. I'd be very suspicious of this entire endeavor.
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    Closed: Re: What is 'Pre voltage'?

    It could be anything: 12V for the preamplifier, vs 12V for the motor, for example. Without a specific example it's impossible to provide a more accurate guess.
  18. [SOLVED]Closed: Re: How to check un-clocked flops and how to trace the source point for the problem ?

    Ridiculous. This is not a problem of “un-clocked flops”; it’s a problem of design. How do you know there are “un-clocked flops”? Did you run a simulation? if you put a signal in a clocked process,...
  19. [SOLVED]Closed: Re: How to check un-clocked flops and how to trace the source point for the problem ?

    Could you possibly be more vague? We are not mind readers.
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    Closed: Re: GBW id different from -3dB frequency

    GBW is gain times bandwidth. At 48MHz you've got A=1, and that's where it starts to rolloff. (Well, not exactly, since you've got some peaking). GBW has nothing to do with the -3dB point. It simply...
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    Closed: Re: lm567 positive edge pulse

    Ah, you’re right, I was looking at supply voltage. And output can sink 100ma, so probably didn’t damage that.
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    Closed: Re: lm567 positive edge pulse

    Again, you don’t want to connect the output to any voltage above 9V. If you connected the base of the transistor directly to the LM657 output, you probably damaged the transistor, lm657, or both.
    ...
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    Closed: Re: lm567 positive edge pulse

    You don’t have enough base drive to turn that transistor fully on, 33k is way too large. How did you arrive at those values?

    And you might damage the output since you’re applying 13.5V through...
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    Closed: Re: auto_off function in microcontroller

    1) what is “PV”?
    2) Do you want to power down the PIC or some external “circuit”?
  25. [SOLVED]Closed: Re: problem moving from SLL to shift_left in ISE 14.5

    not sure what you're trying to do here. It looks like you've got a 32-bit value which is shifted and then OR'd with a single-bit '0'. What are you expecting to happen?
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