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Type: Posts; User: SunnySkyguy

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  1. Closed: Re: Simple question on Transresistance Amplifier circuit

    Consider A as a high gain error amplifier with high input impedance.

    As PD is a high impedance current source it starts to generate an input error voltage from some current but the error...
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    Closed: Re: Photocoupler Saturation?

    Relaxation time during cutoff can be reduced by reducing Re to RL=100Ω and turn ON, VCE=2V, IC=2mA . Load capacitance affects the RC decay (pF) with emitter current shutting off, output impedance...
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    Closed: Re: Identify an electronic component

    Judging by the proximity to B- , it appears to be a low side Nch FET current switch perhaps <50 mOhm.
  4. Closed: Re: Need of Equivalent IC for SST89E51RD-40-C-PIE

    surplus bulk order https://octopart.com/sst89e516rd-40-c-pie-microchip-18823478
  5. Closed: Re: What is the future of Boolean algebra-based languages and methodologies?

    The future is here https://www.rigetti.com/qcs/docs/intro-to-qcs The programming level is hidden and their service is to offer higher level language interfaces
  6. Closed: Re: Microstrip line and ground on same layer

    Coplanar grd tracks actually increase Zo of Microstrip lightly by diverting the coupling. But there exists a ratio of w:h:g where coplanar gap has no effect. At first this seemed counter-intuitive....
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    Closed: Re: Bridge diode thermal problem

    When you choose low ESR caps , the Tau=ESR*C will be < 10us as a result will also be able to handle higher Irms ripple current from I^2*ESR=Pd

    - from self heating Pd*Rja =T rise due to thermal...
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    Closed: Re: RFID Coil design and Simulation

    why 390 MHz ? https://en.wikipedia.org/wiki/Radio-frequency_identification
  9. Closed: Re: Closed-loop Stable for Negative Phase Margin?

    I agree if loop gain is greater than 2nd order near f limit , Bode Plots are unreliable for margin estimates.
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    Closed: Re: Bridge diode thermal problem

    Caps must be have specified ripple current to reduce temp. Derate 30% min. Choose low ESR types.

    Bridge: clamp 10W heatsink with thermal grease or use 30A bridge as %Ipk = 1/%V ripple and I^2R...
  11. Closed: Re: Microstrip line and ground on same layer

    better to use s/w http://www.saturnpcb.com/?download=&kccpid=590&kcccount=http://www.saturnpcb.com/wp-content/themes/saturnpcb/images/Saturn_PCB_Toolkit_V7.08_Setup.exe

    then consider geometric...
  12. Closed: Re: Is FET operating withinin SOA?...Pulsed linear regulator

    Thus you need both SOA to ensure you are well below limit (OK) then use Thermal IMpedance and compute T rise from integrated product of of VI=P_rms * d duty cycle


    I see an average <1 deg C...
  13. Closed: Re: Power considerations for 50 Ohm resistors in power combiners

    just remember to derate power capacity ~40~60% for reasonable temp rise.
  14. Closed: Re: This is a simple capacitor or it has a resistor inside it?

    It's a shorted HPF type metalized plastic Film capacitor

    Get a better one unless you know it was overstressed somehow.

    Also no saving in file size using 7Z on JPG which is already...
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    Closed: Re: OP07 circuit output voltage?

    Japanese schematics are far easier to read than Siemens ones. Your image quality is also poor.

    Focus on the the green circle readings to trace back why the 2.75V is failing for the required for...
  16. Closed: Re: Power considerations for 50 Ohm resistors in power combiners

    Consider what happens if there is a short , open or impedance mismatch rather than a perfect match on all ports. Try 10% mismatch.
  17. Closed: Re: Replaced NiMh battery in small solar light

    My experience with Alkaline bulk purchases from Walmart in Canada are that cheap 100 pack AA cells last 1 to 3 years with low load ( e.g. CO alarm) or no load The Energizers are designed for 10 year...
  18. Closed: Re: Correction of Frequency in Arrival Direction Detection

    One of my 1st designs was replacing ground based Radar with Doppler using OCXO +PLL to 100kHz sub-carrier FM pilot tone on Tx, then received and mixed with same OCXO ( using PLL to scale to same...
  19. Closed: Re: problem: coupling coefficient for two hairpin resonators

    What Q's and coupling coefficient did your expect? Your equivalent BW= 125 MHz averaged at 2153 MHz (but asymm.) results in a Q of 17.

    You may compute the Q from each outside skirt and then the...
  20. Closed: Re: Power considerations for 50 Ohm resistors in power combiners

    - Obtain the thermal resistance['C/W] of resistor Rth, determine if there if any change in condition, test spec, thermal conductor or insulation added. and adjust Rth
    - compute/ convert to RMS power...
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    Closed: Re: To amplify 0-30mV with gain 100

    Serious insufficient overall design specs!!

    what medium air? fluid ?

    Max Pressure? only 37[kPa] ~ 6 psi

    233 mV is far too high for signal.

    Show all design details and measurements
  22. Closed: Re: Buck/Boost Battery Charger works on dummy load, but does not charge batteries

    I just dropped by to see how you manage to evaluate :

    1) the deadtime control in relation to L/R decay time a fly back diode is slow from low V, low R but a Zener diode (high V allows for...
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    Closed: Re: To amplify 0-30mV with gain 100

    If 290 mA was the rated current, then the surge was upwards to 3A which caused your 5V and pressure signal to drop. Replace 5V to 1V R divider with a stable reference voltage or regulator. There is...
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    Closed: Re: To amplify 0-30mV with gain 100

    (1) The pressure sensor is designed to convert a voltage by means of constant current drive

    Use the recommended CC source and INA amp configuration with any parts that satisfy your specs.!!
  25. Closed: Re: Design and construction of scintillometer for evapotranspiration

    They also use a sledge hammer , steel plates and piezo sensors for measuring changes to water table with seismic Wave reflections, diffraction and velocity frequency changes
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