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Type: Posts; User: d123

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  1. Replies
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    Closed: Back-to-back MOSFET circuit not working

    Hi,
    Circuit purpose is to sense presence of a resistive load in order to enable an SMPS and LDO (the 5V input) before a mechanical switch is turned on, otherwise SMPS and LDO should be off to save...
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    Closed: Re: Project using Opamps-intermediate level

    Hi,

    I second Klaus, buy the part or go via software, if needed for a purpose, for learning - very pleasant and instructive.

    A good application note:
    AN-31 Amplifier Circuit Collection

    It's...
  3. Replies
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    Closed: Re: Help identify the item

    Hi,

    Not my area of expertise... No luck with half-hour search for RF transistor package 05 code, I'm afraid. It looks like an RF/MMIC/RFIC FET or BJT, perhaps. Could be micro-x package, not...
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    Closed: Re: Circuit with an integrated FLIP FLOP

    Hi,

    Had time to think about the circuit requiement. Here is an alternate version that also uses a monostable 555 annd BJTs. I hope I understood the function and this achieves it.

    158575

    -...
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    Closed: Re: Circuit with an integrated FLIP FLOP

    Hi,

    Interesting circuit implementation of the idea.

    I noticed T = 1 x R x C. It's actually T = 1.1 x R x C for the 555 monostable. 2 x 4.7uF in parallel and 100k = 1.034 seconds. The trigger...
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    505

    [SOLVED]Closed: Re: Op amp integrator formula

    Hi,

    Thanks. Good point about j² = - 1.

    Okay, other formula. For a 1kHz, 100mV (100mV from ground/0V) input square wave:

    I understand the notion of ∫ from 0 time to x time, but not what goes...
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    [SOLVED]Closed: Op amp integrator formula

    Hi,

    Can someone give me a simple example of this integrator formula, and confirm or correct what "s" is in this formula:

    Vout = - Vin (1/RCs)

    I understand that:
    s = jω
    ω = 2πf
    j = √-1
  8. Closed: Re: thought experiment to understand measuring equipment.

    I really hope not, too. Enthusiasm and curiosity are good things. Can only wish poster well and to continue with interest. From similar beginnings approach I think I had, meaning skipping learning...
  9. Closed: Re: thought experiment to understand measuring equipment.

    Hi, dl09,

    Besides continuing dangerous lack of learning of elementary principles, even Ohm's Law, any DMM has specifications and a user manual - therein lies accuracy of voltmeter, ammeter,...
  10. Closed: Re: Large numbers of paralleled DCDC modules?...more than datasheet recomends

    Hi,




    It says 2,000uF max. in both sections of the electrical specifications, Cext andCext trim, the wording lower down in the datasheet is vague but presumably implies you follow max. values...
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    Closed: Re: capacitive touch sense switch

    Hi,

    Not sure if this is what you mean (if not it might be of use to someone else in the future) :
  12. Closed: Re: Missing schematic can anyone solve this? (hot air soldering station)

    Hi,
    Page 4 of the TI TL431 datasheet, 6-pin package:

    TL431
  13. Closed: Re: Non Overlapping Clock Generator(4 outputs with same frequencies as the input cloc

    Hi,

    Not strictly digital logic components, but in Curing Comparator Instability with Hysteresis, the introductory paragraph mentions one use for a comparator as clock recovery, don't know if that...
  14. Closed: Re: what if i connect a battery to the electromagnet?

    Hi,

    Li-ion need a safety circuit (over-current protection) to prevent excessive current output, some are in-built, others not. "maximum continuous discharge rate is 10 amp" means: Do not exceed...
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    Closed: Re: Dimmer Circuit with Switch Wiring Question

    Hi,

    No idea, blue conventionally neutral and brown single phase live. Black is conventionally used for two and three-phase. As guessing from photos and second-guessing manufacturer wire colour...
  16. Closed: Re: Please Help to avoid short circuit when operating a PWM rectifier ?

    Hi,

    I do very, very simple things like soft start transistors with resistors and capacitors on the gate, not sure how to fit that into your circuit. But coincidentally for inrush control topic, I...
  17. Closed: Re: Please Help to avoid short circuit when operating a PWM rectifier ?

    Hi,

    I don't know about that kind of circuit, so my answer is not much use. It sounds like you've checked that there is no inrush current but fuses blowing and circuit breaker tripping sound like...
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    Closed: Re: Class D amp output current

    Do it dead bug style with in-the-air wiring except for gnd connections and power on a suitable 1oz or 2oz solid plane copper FR4 and use wide traces if you put all power pins on the board. Not sure...
  19. Closed: Re: 2sa1015, 2sc1815, 2sk1825 and LMC660 EU replacements?

    Hi,

    That's cheeky ;-), you can easily look at any substitute part website or manufacturer's parametric search tools for substitutes... Just check the basic specs and go from there. For example,...
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    Closed: Re: lm567 positive edge pulse

    Hi,

    Also, regarding resistive divider supply voltage, it might be of help to place a 10nF to 100nF capacitor across each resistor.

    What is the PNP feeding - is it literally an LED, a high...
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    Closed: Re: lm567 positive edge pulse

    Hi,

    I might be wrong but:

    If you have to use a resistive divider to divide down 13.5V to more or less the recommended 8.5Vmax, make R1 (from V+) = 1k and R2 (to gnd) = 1.6k = 8.3V and at same...
  22. Closed: Re: Arturia's True Analog Emulation, how does it work?

    Hi,

    VCO chip like XR2209 is easy to use for square wave and triangle wave. Square wave output or 555 can be used to turn on/off bjt inverter with capacitor from collector to ground charged in...
  23. Closed: Re: PMOS and difference amplifier simulation questions

    Hi,

    Thanks.

    Quickly, diff amp just in simulation to try to measure PMOS voltage drop and estimate RDSon from there. Had diff amp schematic from other circuit with gain of 25 where resistor...
  24. Closed: PMOS and difference amplifier simulation questions

    Hi,

    I'm trying to understand RDSon a little in this circuit and a difference amplifier output voltage. I suspect that such low RDSon is either my bad maths or a very idealized PMOS model as it...
  25. Closed: Re: Using an external voltage feedback loop with a DCDC module....why not possible?

    Hi,

    DRM doesn't show Trim architecture, PRM sheet does, so guesswork a bit pointless. PRM says 'not recommended' rather than shouldn't.
    Maybe causes instability of some kind with certain values...
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