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  • Users: xray
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  1. xray

    Current division based on saturation current

    I am inquiring about selecting transistors for current division by its saturation current near DC. I would like to realize a 100:1 ratio current source by selecting like transistors with a 100:1 saturation current in a simple mirror. Question: is there a parameter search where I can input...
  2. xray

    Flow sensor has two no flow states

    I am inquiring about some ideas on how to handle a turbine pickup flow sensor, cheap model about $12. The sensor has three states: 1. NO FLOW - gnd, 2. NO FLOW - +V, 3. FLOW - variable frequency square wave. The signal is low pass filtered and drives the gate of an nmos fet indicating flow or...
  3. xray

    No wires, chip programming

    I want to get a discussion going on Bluetooth technology: It is my intention to design a development board with bluetooth and an FPGA. The limited scope of the project is to implement a fairly robust bluetooth link via linux 2.6 kernel running on a Xilinx FPGA. Fpga's are my area of interest...
  4. xray

    PCB BGA gigabit tranceivers

    Is anyone using pcb design to incorporate two boards with gigabit transceivers, like a motherboard and a daughterboard? I would like to design a system that allows gigabit tranceivers from pcb to pcb without component connections in between the boards. I am thinking of a BGA to implement it. Is...
  5. xray

    weibbridge to diff pair?

    Looking to build up a gain stage out of a load cell. Client has placed a load cell on an electric trailer brake to actuate increased torque on a big whirly gig, vertical blades wind mail. There is not enough output 3mv/V to see a voltage on the oscope? Can read some change with a digital voltage...
  6. xray

    Professional Engineers

    I am looking to get my professional engineer's license in the state of MT. It is required that an engineer in training work under a PE for four years or there are other equivalences. I believe MT law states that my master's degree affords me two years toward the four required. I am inquiring the...
  7. xray

    Calculating Current for NTE2380 (Mosfet)

    I have put together a motor driver for a linear actuator, 12V 4 amps 10% duty pulse width less than 300 Usec. The circuit is a variable duty 15V 555 timer driving the gate of an NTE2380 (Mosfet transistor). I have been trying to use the datasheets and measured values to calculate the drain to...
  8. xray

    Zero Source Electronics

    I am looking for information on a circuit or physical configuration that having no source, however, can respond to a EMW (elecromagnetic wave) ping. The response would be a certain frequency output for a given temperature. Am I dreaming, is this information hgihly coveted and not available, or...
  9. xray

    Xray detection

    I have a question. I have a successful photodetector circuit with 8-bit resolution from an on mcu adc. works well from a dark room to room well lit. The detection comes from a simple 1n4148 glass encased diode a couple of op amps to give a dc offset for low readings and approximatley 100 times...
  10. xray

    Hello All: I have a question con

    Hello All: I have a question concerning driver design utilizing C, and or object oriented C++. I am designing a small microprocessor Motorola HC908 to handle USB Communications. I would like to learn the driver design aspect of putting this project together and would appreciate any websites and...
  11. xray

    output hum humdrum

    Howdy: Looking for a little information on the increasing of the S/N. I have a portable electret microphone feeding a preamp and then to an adio output power amp, LM4860. My problem is as the power output of LM4860 goes up the voltage regulator LM7805 shows a ripple of the increased demand of...
  12. xray

    Output hum humdrum

    Howdy: Looking for a little information on the increasing of the S/N. I have a portable electret microphone feeding a preamp and then to an adio output power amp, LM4860. My problem is as the power output of LM4860 goes up the voltage regulator LM7805 shows a ripple of the increased demand of...
  13. xray

    Wanting to know about attaching an

    Wanting to know about attaching an 80 QFP to a PCB I have designed. The 80 pin device is a SMT and there does not seem to be enough room to use a sodering iron. Is there a way with limited equipment to attach the QFP? Thank you for your time and Know-how. Cy Drollinger
  14. xray

    tantalum, ceramic, or aluminum electrolytic

    Being the novice that I am; Here is the question: In designing a microcontroller board for an HC912B32 what is the difference between all the various types of capacitors? I have two values 10 Uf and .1Uf. The two different cap value supress relatively low and high frequencies of the MCU. How...
  15. xray

    transistor equals temperature

    Hello: I am trying to get a general purpose transistor e.g. 2n4124,CA3046, or 2n2222, to yield 1 degree accuracy of the enviromental air temp. Using a delta Vbe, My Eq. is: T=(q(Vbe1-Vbe2))/(K(LN(Ic1/Ic2)). The circuit plus Eq. yields roughly 40 deg. at room temp 22 deg. Am I missing...
  16. xray

    variable amplifier

    I'm currently trying to put together a variable gain for volume control of a medical listening device (20-2kHz). The preamp is a low voltage op amp LM6582 wired in an inverting configuration -(Rf/Ri). The adiuo amplifier is a low voltage LM4860 1W essentialy an inverting configuration. The...

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