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Type: Posts; User: kripacharya

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  1. Replies
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    Closed: Re: chinese generator not working

    Did you provide DC power with correct polarity ?

    Did you press the PowerOn switch for >3 seconds?

    No other help from here is possible.
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    Closed: Re: Linear led current regulator

    :clap: good call !

    Alternatively just use an Lm317 current source config. But then the max current is limited.
  3. Closed: Re: Does PIC16F18856 work if centre pad is left floating?

    Don't know for sure, but you will notice that wording in same page footnote#2 uses the word must be connected... , while note#3 says should be connected.
  4. Closed: Re: Identify capacitor with marking code L62 104

    Agreed. Even later for me. 100nF it is.

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    Well, the X5R notation is well known - it specifies temperature/ stability/ voltage etc. The L62 don't know.

    Is there a pic,...
  5. Closed: Re: ESP8266EX based wifi module does not respond on any AT commands ( E103-W01-IPX)

    Updating Chinese ESP8266 modules is tricky. You must be very sure what you are doing. Read the literature in detail before proceeding.
  6. Closed: Re: GPU with general purpose operating system

    Well.... John... then you are younger than the both of us ;-)

    Brian needs to update his pic. Uhh.. so do I.
  7. Closed: Re: Every few Hours clock running fast rtc1307

    It would seem that OP was using an inappropriate reference to check the accuracy. A common noob mistake.
  8. Closed: Re: Identify capacitor with marking code L62 104

    Please post a hi-res pic of the component.

    While we wait for that, "104" probably implies 10,000 pF, or 0.01nF. The pic would clarify if this is correct or not.
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    Closed: Re: Generating a frequncy

    :thinker::bang:

    Why didn't I think of that ?
    Oh yeah... Because it is not feasible.
  10. Closed: Re: how to design a thermostat without Microcontroller?

    Great to know it's working! I'm sure all contributers will be happy to read this.

    My advice - check the operations / play with this circuit until you know exactly how it operates / behaves for...
  11. Closed: Re: GPU with general purpose operating system

    Wow. Haven't come across that term in... umm.. decades? :thumbsup:
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    Closed: Re: Generating a frequncy

    I think you are confusing this forum with Google.
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    Closed: Re: Stable PWM during Voltage Loss

    Clearly this is some specialised equipment which I do not understand (Buck plant?, 5amps?, unknown voltage?).

    However the 'normal' way to bridge power outage would be by using a battery...
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    Closed: Re: Stable PWM during Voltage Loss

    Your descriptions are incomplete and inconsistent. Very difficult to provide any meaningful suggestions.
  15. Closed: Re: Does Solid State Marx Generators actually work?

    Ah ha. My mistake in transcribing your circuit into SPICE. Ignore my previous post :smile:
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    Closed: Re: Stable PWM during Voltage Loss

    It would be useful to know what exactly your 'plant' is. And how often you require this 50uS hiatus?

    If your plant is a motor, then maybe loss of pwm drive for 50uS can be tolerated simply through...
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    Closed: Re: pic16f877a + spi + 93LC46A-I/OT EEPROM

    Interesting AppNote. Especially this line quoted from the text "Since the Microwire protocol is not native to the MSSP module, a version of SPI mode 0,0 has been implemented and works within the data...
  18. Closed: Re: how to design a thermostat without Microcontroller?

    He means between lm35 output pin and lm358 input pin, but close to lm358 side.

    I urge you again to put lm35 directly on board temporarily just for testing purpose, and try then.
  19. Closed: Re: how to design a thermostat without Microcontroller?

    The circuit is fine, except for cap at C3 (10u) which I believe should be removed.

    From your pics I cannot see the lm35. The wires for lm35 looks suspect, and could be picking up powerline A/C...
  20. Closed: Re: how to design a thermostat without Microcontroller?

    If this is so then source of problem is not visible to us. Hence please post multiple pics of your implementation, as well as accurate updated schematic including all elements.

    Maybe we can spot...
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    Closed: Re: pic16f877a + spi + 93LC46A-I/OT EEPROM

    I don't know how your SPI_write works. It is probably byte oriented. Also what control is there for clock speed?

    You could write your own bit-banged routines which handle non 8-bit transfers and...
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    Closed: Re: pic16f877a + spi + 93LC46A-I/OT EEPROM

    Clearly you are referring to datasheet of some other device. Please cross-check and confirm precisely which eeprom you are talking about.

    - - - Updated - - -

    Okay, I think I have located the...
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    Closed: Re: pic16f877a + spi + 93LC46A-I/OT EEPROM

    I am simply looking at datasheet of 93LC46A, which is what you mentioned. Clearly mentions 9-bit in many places. Also, it's A5.. A0 and not A6.. A0
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    Closed: Re: pic16f877a + spi + 93LC46A-I/OT EEPROM

    Many points can come to mind. However most important one is that the Instruction set for your ic is 9- bits length. I cannot see where/ how these 9- bits are being formed or managed.
  25. Closed: Re: Does Solid State Marx Generators actually work?

    Interesting.
    My rudimentary analysis indicates that each of your caps would have to charge through your load, in sequence starting with your last stage and working backwards to the 1st stage. That...
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