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Recent content by EEHobby

  1. E

    LTC3890 does not give me enough current output

    I designed a step down DC/DC voltage controller using LTC3890. I have an input voltage of 48v, and I want an output 12V, 3A, and an output 5V, 3A. However I can not get that much current. Any ideas? Please see the attahced schematics Thanks for help
  2. E

    I have trouble to get 16 bit data transferred on ISA bus

    Hello, Everyone, I have some troble to get 16 bit data transferred on ISA bus when I have more than one data acquisition board on the PC104. This data acquisition board is my own board. I have an address deconde to generate a read signal, which will read the a FIFO, this read signal also pull...
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    ferrit beads, inductors in analog board for noise reduction

    Re: ferrit beads, inductors in analog board for noise reduc attached file is the schematic. I am using DXP 2004, which is protel. I have three power coming into the board, +12, +5, -5. HCF4067 is an analog switch for multiplexing. IRF830 is used for generating negative spike. AD604 is used for...
  4. E

    ferrit beads, inductors in analog board for noise reduction

    I have desinged an ultrasonic system. However the singal is very noise. Then I added a couple of ferrite beads on power suppy to the board, It seems work much better. But I wonder if there is any rule on using them. Can I just use ferrit beads as much as possible? I was using inductor with two...
  5. E

    please share your exprience of using HCTL-2032

    Any body has used Agilent HCTL-2032? I have encoder A and B input, but I can not get output pulse at CNTDECx and U/Dx. The clock I am using is from a micro controller crystal oscillator. There is a DC component. Its peak to peak is about 2V. It is 10MHz. I don't know if the problem comes from...
  6. E

    I can not get the voltage clamped with the diodes

    I have the following simple circuit. When I trigger signal comes into Q1, at P1 a negative spike will be generated and it will be used to excite a transducer. This transducer also acts as a receiver, so the returned signal will be picked up at CH1AO. To protect the circuit after CH1AO, I add two...
  7. E

    From +12V to +300V, I can not get it

    Thanks for your help. I am going to add the components you recommended. The only thing I am concerned is the efficiency. I am using 300V to charge a capacitor. When it is trigged, the capacitor will discharge and excite a transducer. So I don't really need high current. This is going to be used...
  8. E

    From +12V to +300V, I can not get it

    No. The primary oscillator does not work. For the two transistor, Q10 and Q11, sometime the collector of Q10 is 12V, the collector of Q11 is 0v when I power on. some times the other way, but I did not see any oscillation.
  9. E

    From +12V to +300V, I can not get it

    Attached image is my design. It is based on the following link **broken link removed** The componet I used is Transformer: data sheet is below **broken link removed** Transisitor : MJE3055. The data sheet is https://www.onsemi.com/pub/Collateral/MJE2955T-D.PDF But no way can I get 300V...
  10. E

    where can I get a cheap programmer for CY7C245A(PLCC 28)?

    I have a small project and use CY7C245A-25JC, it is PLCC28 package. Can any give me any info. where I can find a cheap programmer for this IC? Thanks. Eric
  11. E

    fixed voltage regulator vs adjustable voltage regulator?

    fixed 5v best voltage regulator Thank your guys very much before for giving me help on getting -5V before. I am working on a portable instrument. My power supply is +12V battery. I need both +5 and -5 power for other IC. The method your guys recommended for generating -5 is really helpful for...
  12. E

    how can get -5V from +5 or +12?

    I have to use a amplifier, it requires -5 supply. The power I have is +12V. How can get a -5V from a +5V or +12V. Thanks.

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