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  1. Closed: Re: How to make a working super pulsed laser module or device?

    The 74AHC123 I mentioned was to drive the ETX-10A not a laser so I am sure is perfectly adequate.

    Keith
  2. Closed: Re: How to make a working super pulsed laser module or device?

    Inductance is often a limiting factor so high voltages are used to reduce the rise time with a fixed inductance. 5nH is typical of the package inductances. If you want a very fast rise time/short...
  3. Closed: Re: It is pleasure ,that if has a mobile application for Edaboard

    What about the issue that Topify adds advertising (for Topify) to all posts but advertising is against forum rules?

    Keith
  4. Closed: Re: It is pleasure ,that if has a mobile application for Edaboard

    Unfortunately topify inserts advertising into the posts which are not allowed within the forum rules.

    Keith
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    Closed: Re: pullup resistor value for I2C

    I am not a big user of I2C but as shown in the graph from andre_teprom it is highly dependent on the capacitance. Assuming the components in the original post are on the same PCB I doubt that the...
  6. [SOLVED]Closed: Re: I connect a 10MHz ref signal to a scope and detected one 10MHz and 20Hz signal. W

    If you slow down the timebase the sampling rate will change. Usually this is shown on the display somewhere. There are ways of avoiding this depending on the oscilloscope. I always run mine in...
  7. [SOLVED]Closed: Re: I connect a 10MHz ref signal to a scope and detected one 10MHz and 20Hz signal. W

    If you are using a digital sampling oscilloscope it sounds like you are looking at aliasing of the high frequency signal with the oscilloscope sampling frequency. The 20Hz is the difference between...
  8. Closed: Re: is there any free but good/decent/usable schematic editor for analog IC design?

    Unless it supports BSIM 3 and BSIM 4 models then it will be no use for IC design. Also, netlist export for LVS is a requirement as is AC analysis.

    LTspice is workable for bipolar IC design I...
  9. Closed: Re: [MOVED] Third order active butter worth filter acting strange

    You final output stage looks suspect. How much quiescent current is there in the final stage? A fixed voltage to the gate of the transistor is a poor way of doing things even for a proof of...
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    Closed: Re: ekspansi memory 4kx8 to 256kx8

    My guess is he want a circuit to expand 4kx8 memory to 256kx8 but this is in the FPGA section so may need moving.

    Keith
  11. Closed: Re: is there any free but good/decent/usable schematic editor for analog IC design?

    I don't think Falstad will be much use doing IC design. As Dick suggested, LASI is probably one of the few (only?) free ones. I have used it for layout but I must admit to using a commercial Spice...
  12. Closed: Re: Please help me for my first program in C

    That is actually a semi-colon (but the correct syntax).

    Keith
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    [SOLVED]Closed: Re: EE 8223- analog IC design

    http://www.erc.msstate.edu/mpl/education/classes/ee8223/syllabus.pdf

    Keith
  14. [SOLVED]Closed: Re: basic query on gate array, structured asics and standard cell asics

    Same thing - programmed by metal at the end. The difference is the structure of a gate array is a simple, repetitive "sea of gates" whereas a structured ASIC can have a more complex structure.
    ...
  15. [SOLVED]Closed: Re: basic query on gate array, structured asics and standard cell asics

    With gate arrays the processing is stopped before final metal layers and the wafers stored. The final metal layers are added later to suit the customers requirements.

    Keith
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    Closed: Re: I cannot access this site anymore

    Yes, it's weird. Just checked my PC and dates are US date in numbers. Went to Opera browser and before logging in they are alphanumeric i.e December etc. When I log in they change to numeric US...
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    Closed: Re: I cannot access this site anymore

    Working on my mobile - I will check my PC later.

    Keith
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    Closed: Re: I cannot access this site anymore

    Where has the option for selecting the date format gone? I cannot find it any more. It used to give the option of European/US and normal/extended.

    Keith
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    Closed: Re: I cannot access this site anymore

    Strange - I see "12-14-13, 10:43 PM"

    Keith
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    Closed: Re: I cannot access this site anymore

    It is still showing as a USA numeric date for me. The option to select European date seems to have disappeared unless I just cannot find it.

    Keith
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    Closed: Re: IRF 9540 pmos with 2n2222

    Have a read up on MOSFET gate drive circuits
    www.ti.com/lit/ml/slup169/slup169.pdf

    Keith
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    Closed: Re: I cannot access this site anymore

    Any chance you are going to fix the date format problem? While you have make it correct for you, it is incorrect for the rest of the world! A useful addition would be tho allow selection of YY-MM-DD...
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    Closed: Re: IRF 9540 pmos with 2n2222

    That is not a good way of driving a MOSFET. Firstly you are exceeding the maximum gate voltage which is 20V but more importantly you are simply relying on a 3.3k resistor to turn the MOSFET on. With...
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    Closed: Re: pspice convergence problem in bias point

    You have no node zero, probably because you have used the wrong GND symbol. Change your GND symbol for the correct one or add a zero voltage source or zero ohm resistor from GND to node zero.
    ...
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    Closed: Re: is cmos ota ic available in market???

    Sorry , I didn't have a chance to check properly.

    Have a look at the MAX1886. That is CMOS I think and is a transconductance amplifier that I have used in the past.

    It is not CMOS but have a...
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