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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...

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.).

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...

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...

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...

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...

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...

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...

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.

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...

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...