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  1. tdbeng

    Receiving data via modem

    Hello -- I'm working on a project where I can call my home phone number, and after 5 rings my home PC "picks up" via a modem. Then, I want to be able to enter in a series of numerical codes to change things on my PC. I'm at the point where, using VB and Hayes-compatible codes, I can...
  2. tdbeng

    Blocking Voltage

    Can you just remove the voltage input from the circuit altogether? Make the current input your only input connection. When the input signal is 0-20mA, the circuit is fine as it is. When the input signal is +/-10V, remove R63 (either by removing a jumper, turning off a relay, digital pot, etc.).
  3. tdbeng

    4 vs. 6 lead wire stepper

    I have a stepper motor controller / driver for bipolar stepper motors. It has 4 leads on the end of the motor connector. Can I use this driver with a 6-lead stepper motor (given that I get A and B wired correctly)? The application requires fairly accurate positioning +/- a couple of steps...
  4. tdbeng

    Isolating Analog and Digital GNDs

    What is the purpose of placing an inductor between analog and digital grounds? I've seen this done several times in data acq. and control circuits. For example, I have this circuit on a single PCB that uses +24VDC and +5VDC, which come from different switcher supplies. The +24VDC is being...
  5. tdbeng

    Sound_detector

    I did something similar in my garage that flashes a green light when the car is close enough to the back wall (wife was always running into the trash cans!). I used a linear inductive proximity sensor to detect the distance to the metal grid on the front of the car. Would this be an option for...
  6. tdbeng

    Linear Voltage Regulator Basics

    All, Thanks for the help. I thought about a switcher, but I need to get something completed by the end of this week. I breadboarded the regulator with three 2.5A diodes in series, and this cut the input down around 9.5V. This noticeably took some of the heat from the 317. Also, I put the...
  7. tdbeng

    Linear Voltage Regulator Basics

    Hi All, I'm using an LM317 (TO-220 package) to regulate a supply voltage of 7.5VDC from 12VDC. It's the basic LM317 circuit: 0.1uF cap on the input, 1.0cap on the output, forward diode from output to input, and two resistors on the adjust pin so Vout = 1.25*(1+r2/r1) + Iadj*r2. I'm using...
  8. tdbeng

    Looking for High Temp AC or DC-Brushless Motor

    We are looking for either an AC motor or DC-brushless motor that can work under 0-100°C temperature ranges (this is the estimated winding temperature even with a cooling fan, ventilation, and heat sink). The specs include: -3000 to 6000 rpm (it will be fixed speed, but these are the acceptable...
  9. tdbeng

    PCB Manufacturers???

    Thanks to everyone's suggestions. I've already received quotes from some of these companies for a new project I'm working on. Most of them have been under PCBExpress' price! Now I think it is just a matter of convenience. Thanks again.
  10. tdbeng

    PCB Manufacturers???

    I was wondering what printed-circuit board manufacturers people like to use. I work on small EE projects at home, and would like to find a someone to make prototype boards at a low cost. I've used PCBExpress in the past, but it seems like I should be able to get one made for less than...
  11. tdbeng

    Speech Recognition IC

    Does anyone know of an inexpensive speech recognition IC? I am working on a project that requires around 40 to 50 words to be recognized. It will interface to a microcontroller, so I can work w/ any type output. I have heard about Philips' "Hello IC", but could not find any...

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