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Type: Posts; User: Zak28

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  1. Closed: Re: measuring slow oscillations with magnetic methods

    Are there non invasive methods aside from infared? The MEMS sensor requires mounting onto object, they are ideal for several measurements and infact are ideal for lateral displacements such as found...
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    Closed: Re: tda2030 amplifies noise

    Why would a pot of this arrangement need its 3rd pin grounded which would draw current thru the entirety of the 200R resistor into ground making no use of it? The 200R pot was selected to demonstrate...
  3. Closed: Re: measuring slow oscillations with magnetic methods

    Acoustic and mechanical movement are very related. This case its mechanical oscillation which requires specialty pick ups since they don't output typical acoustical frequencies.

    The nice object...
  4. Closed: measuring slow oscillations with magnetic methods

    Need to obtain natural oscillation frequency for several fr4 boards and other non PCB objects. Striking the objects emanates low frequency tone which dampens out rather quickly. The trouble with...
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    Closed: Re: tda2030 amplifies noise

    Its not the iCs, the're authentic. Whats the typical RMS volts into the non inverting pin for this single supply amp?

    Is this a decent filter or can values be improved?
    ...
  6. [SOLVED]Closed: Re: does copper tape need grounding when sheilding plastic enclosure

    Is it ineffective without grounding?
  7. [SOLVED]Closed: does copper tape need grounding when sheilding plastic enclosure

    If employing a plastic enclosure for a noise sensitive board perhaps an audio preamp or other forms of preamps and using copper tape for sheilding, does the copper tape need to be grounded to the...
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    Closed: Re: tda2030 amplifies noise

    Seems product class d with germanium transistors was liquidating on hand old stock with the advent of silicon parts they become obsolete. Many power germaniums had 5Khz f(t) far too slow for class D...
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    Closed: Re: tda2030 amplifies noise

    Were tubes detrimenting quality caused from vacuum pressure loss, electrode deterioration or was it from another issue? The tda amp board was recently submitted for fabrication. Is it fine to employ...
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    Closed: Re: tda2030 amplifies noise

    Were thermionic valve audio amps available far prior to mentioned electronics boom duration amplifiers any better in quality? Seems many very old tube amps are still entirely functioning considering...
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    Closed: Re: tda2030 amplifies noise

    Was enormous distortion due from improper layout and absence of noise reduction? It shouldn't have had much issue if it was battery powered.

    Is there a drop in upgrade to lm1875 or at least a...
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    Closed: Re: tda2030 amplifies noise

    Whats form of products were tda2030s typically employed in? They seem fine for mic amplification but for audio it would require proper component selection such as metal foil resistors and proper...
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    Closed: Re: tda2030 amplifies noise

    Are PNP class a amplifiers less prone to amplifying noise as did this specialized audio IC?

    The noise was not a tone, it was high pitched static and was constant regardless of how much the input...
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    Closed: Re: tda2030 amplifies noise

    Going to fab the board after laying it out further. Is this proper arrangement with the suggested capacitor and pot?

    https://i.ibb.co/PhQPkMj/img.png
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    Closed: Re: tda2030 amplifies noise

    Not sure were to place suggested resistor - would a small variable resistor be better? Perhaps it can be adjusted to notch out the noise.
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    Closed: Re: tda2030 amplifies noise

    I redid the board with film caps implace of any capacitors dealing with input audio. The only MLCCs are low value bypass caps. Is this how the suggested 100pF should be?
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    Closed: Re: tda2030 amplifies noise

    It appears to be high frequency pitched tone, TDA2030 is excellent for audio amplification, there is class A and I have many TTA1943(Q) and TO-3 parts for hifi if required.
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    Closed: Re: tda2030 amplifies noise

    Perhaps heatsink is a major cause of noise as there is no copper under the heatsink and its not isolated from TDA tab. Going to fab this board since I discarded the others for their issue with...
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    Closed: tda2030 amplifies noise

    Recently made a 12v single supply tda2030 amp and its very noisy. All non polarized caps are 0805 or 1206 MLCCs the board has footprint for 4700uF rail capacitor instead of 220uF - haven't tried...
  20. Closed: Re: can boost converters cause gate loop ringing

    I meant the mt3608 for lowside switching and didn't include that in the original description.

    It should serve fine for supplying low side NMOS gate driver?
  21. Closed: can boost converters cause gate loop ringing

    MOSFETs can be very inefficient with insufficient Vgs even if peak current is coming from a capable gate driver but at insufficient voltage.

    Would a high frequency switcher such as this MT3608...
  22. Closed: Re: can secondary inductance be determined from provided data

    Secondary has an enormous reactance to its rated 1.5mS period yielding ~4190R.

    However is that impedance only applicable to sustained oscillations or is impulse current at its rated period also...
  23. Closed: can secondary inductance be determined from provided data

    Recently obtained this for its great peak current handling but nothing about secondary inductance.

    https://www.summitracing.com/parts/pnx-d3070


    Primary Resistance: 0.350 ohms
    Secondary...
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    [SOLVED]Closed: Re: Are there relays made for inductive loads

    Mechanical relays aren't fast enough. There aren't solid state relays which can perform for this?
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    [SOLVED]Closed: Are there relays made for inductive loads

    Are they relays which are made to drive inductive loads and can subsittute a low side FET for =<140Hz?

    This would be for high voltage transformers from low voltage input.
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