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I agree with the temperature testing idea – it is the most effective way to find bad solder joints. However, I would add that you need to change the temperature rapidly (>20C/min) in order to do much good. BTW – this called HASS testing – Highly Accelerated Stress Screening, or ESS –...

If you email me the CRK., I can review it for you and give you my opinion. Hard to tell from the description. Steve Owens Steve.Owens@FinishLinePDS.com

You can use EMR (Electromagnetic Resistivity). Just send a radio wave through the water and measure the speed it travels. Use one transmitter, and two recivers. Measure the phase shift between the two, and you have the speed. Steve Owens Finish Line Product Development Services...

I think PCAD is the one to use. Steve Owens FinishLine Product Development Services www.FinishLinePDS.com

Make a control system with a photo transistor to control the output of the LED. Steve Owens FinishLine Product Development Services www.FinishLinePDS.com Steve.Owens@FinishLinePDS.com

OK Thanks, I thought the X10 transmitted when the zero cross ocured on the A/C. I'll check into it. Steve Owens Finish Line Product Development Services www.FinishLinePDS.com Steve.Owens@FinishLinePDS.com

The x10 is for AC, will it work on DC as well?

Does anyone know of any power on communications IC? I have DC power, and need to modulate a low speed digitial communication signal on it (like from a UART). I could dsign my own from PLLs and Drivers, but there must be a IC out there that does this? Have searched all the sites I know of, but...

What kind of power and what kind of data? This is not always a bad idea. In fact, some people run commincation on the power (viz. X10. Steve Owens Finish Line Product Development Serives Steve.Owens@FinishLinePDS.com www.FinishLinePDS.com

I am looking for a cheap protable terminal with a printer, much like the one show here (except general purpose): http://www.timetradeusa.com/vibe.htm I just need to get information via RS-232 and print it, so it does not need any kind of fancy operating system. Steve Owens FinishLine Product...

Are you trying to use the exsisting IR control that came with the camera? If so, then you need to convert the servo output to on-off switches, and some how connect those to the control. The output of a R/C reciever is PWM, But it is not 100% duty cycle. If I remember, it is about 10-20mS, so...

Does anyone know were to get some high quality 3.5MM stereo jack and plug? Would really like a gold one, but just can not seem to find anything but junk. Steve Owens Finish Line Product Development Services www.FinishLinePDS.com Steve.Owens@FInsihLinePDS.com

XTAL will be more accurate and stable over temperatue. Resonator will be cheaper. I think that they will both draw about the same amount of current, although, it is likely that if you built your own it would be less than most off-the-self osc. Statek used to sell some real low power osc, not...

Power the scope with a 12V battery and an inverter. Now you can put scope "gnd" anywere. Steve Owens Finish Line Product Development Services Steve.Owens@FinishLinePDS.com www.FinishLinePDS.com

Easy, just send a 0x00 to 0xFF out the serial port. It will give you some were from +/- 5V to +/- 15V, most likely +/- 9V. It will be slighly off becuase of the start bit - set it up for no parity and only one stop, but it will be a good approximation. The RTS idea is also pretty good, but...

For lead acid batteries, you need a "float charger", not a power supply. A "float charger" is one that reduces the current to the battery as the voltage in the battery goes up. Normally, the "float" voltage for 12V lead acid is 13.7V. The "float&quot...

Why not just use a multiplexer to switch between the two? Steve Owens @ FinishLinePDS.com

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You can try expresspcb.com - it's free, but only they can make your PCB.