Type: Posts; User: schmitt trigger

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  1. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    Have you tested *several samples* under different load, line and temperature conditions, and validate that there is no condition which would cause current hogging and/or another anomalous behavior?
  2. Replies

    Closed: Re: Wht is the purpose of this op amp

    It is a simple voltage follower configuration.

    In my opinion, if one is going to use an opamp anyways, it is better to implement with it a higher order filter.
    Far less ripple for a given cutoff...
  3. Closed: Re: Frequency Generator XR-2206 PCB Design Missing Components

    One question:
    Do you have a schematic for your project?

    This is a very important question. Blindly copying a layout without the benefit of a schematic netlist, a mistake is very likely.
  4. Replies

    Closed: Re: Easiest way to get 5v and ~1V

    +1 What Klaus just mentioned.

    Before the advent of rail to rail opamps, one had to procure a negative supply, a big hassle for battery operated products.

    Nowadays, with the proliferation of R2R...
  5. Closed: Re: Project using Opamps-intermediate level

    A graphic audio equalizer.
  6. [SOLVED]Closed: Re: Trouble with frying 74LS11N AND Gate

    The 74LS11 IC is a triple, 3 input AND gate.

    What are you doing with the inputs of the two other unused gates?
  7. Closed: Re: Does It Make Sense to Connect SMD Fuses In Parallel Instead of Using Bigger One

    Additionally, it will cost 3 times as much.
  8. Replies

    Closed: Re: Need Suggestions to run DC Motor

    Agree that using an optotriac to drive a relay load is not a good idea.

    And feeding the relay coil from the variable VDC used for the motor? Another bad idea.

    Placing a 50 ohm resistor in...
  9. Closed: Re: How the washing machine Automatic Load Sense works?

    Universal motors would have at most four wires.
    Two for the armature and two for the field.

    Those are reversible. Non reversible have only two wires.
  10. Closed: Re: How the washing machine Automatic Load Sense works?

    An induction motor, specially those dreary split phase devices are used, have so many no-load losses that they will obscure any additional current draw.
    This in addition to the drum's high inertial...
  11. [SOLVED]Closed: Re: Transformer saturation & ACM control

    If the LPF cutoff frequency is lower than the reciprocal of a half period, I would say that ACM would not reliably prevent assymetrical core saturation.

    Think of one situation. Let's say, as an...
  12. Replies

    Closed: Re: Discrete transistor voltage regulator

    Again; as suggested previously, download LTSpice and simulate the circuit!

    Simulations allow you a few things:

    -Change components at your heart's delight. Nothing will blow up, no magic smoke...
  13. Replies

    Closed: Re: Discrete transistor voltage regulator

    Again, I encourage you to build a discrete transistor regulator, because it is a *very valuable* learning experience.

    Start with the circuit you have. Once that it is working, poke around the...
  14. Replies

    Closed: Re: Discrete transistor voltage regulator

    Additionaly.... There is no fast and direct method to measure the die’s temperature.

    Even if the series pass transistor is within its SOA boundaries, poor heatsinking, thermal interfacing or...
  15. Closed: Re: ATA6561 getting shorted frequently

    Voltage sequencing.

    Have your read the data sheet and verified the timing relationship between voltages at power up?

    It might be a non-issue, but please check it out.
  16. Closed: Re: Motor dummy load resistor calculator

    If the 24 Vac you quoted was measured line to line, the resistors should be connected in delta.

    Also, the equation for the delivered power is

    P = I x V x sqroot(3)
  17. Replies

    Closed: Re: How to write data ds1307 for 8051

    On most I2C devices, once that you have sent the device's unique address, and will send the register's (n) address that you would like to write into.

    If more than one byte will be written, you can...
  18. Replies

    Closed: Re: 90V DC source for DC Motor

    Are you in the US/Canada/Mexico or other country where the nominal AC voltage is 120VAC?

    If so, a full-wave SCR controller will provide the required VDC average voltage.
    Vave = Vrms/1.11 or 108...
  19. Closed: Re: Oscilloscope probe voltage derating vs frequency

    Makes sense now!

    I was wondering how come a 600VDC probe would only withstand about 50V @ 10 Mhz, which is not that high in frequency.

    Fortunately, logic circuits running that fast are all low...
  20. Closed: Oscilloscope probe voltage derating vs frequency

    What is the technical reason which the scope probes are derated with frequency?

    This is a generic probe from TPI, but have seen the same behavior on other brands, too
  21. Replies

    Closed: Re: Power pulse generate 30V 400A

    Is this a spot welder?
  22. Replies

    [SOLVED]Closed: Re: Transformers on a PCB

    An LM386 is an audio amplifier, with significant gain.

    Your transformer appears to be a powerline 50/60 Hz device with an EI core. Such transformers are notorious to produce significant stray...
  23. Closed: Re: Offline power supply for class D bass guitar amplifier

    Really, any SMPS which has been designed for an audio amplifier should work.

    And indeed, stiffness of the supply is one requirement. But I would say it doesn't have to be lightning fast. I've seen...
  24. Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    Something that has not yet been mentioned that has a significant layout impact: thermal management.

    A newbie design (hard switching, non-optimized magnetics and other things) with such low input...
  25. Closed: Re: In accuracy in AC Voltage measurement

    The semiconductor companies sell double diodes which are specifically designed to protect microcontroller inputs from an overdrive.
    These have low leakage and low Vf.

    Having said that, if your...
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