Thanks for the suggestions, everybody! This problem was put to rest by occasionally giving the phototransistors enough time to come out of saturation. The ...
Most of that looks fine. But L1 wants to be in series with Y1, not in parallel. You are looking for a series tuned network so impedance is a minimum at...
Hi Doug, P319 arrived in the mail last week. It came with a pigtail cable potted into the housing. On the end of the cable is an unusual 5-pin connector. Do...
As I recall the transducer came with about 10' of cable with an odd 3 pin connector, 2 pins for the element and a shield. If it is 5 pins it probably has a...
What is the best type of pressure sensor for measuring the heart rate or blood pressure? We are currently doing a project that will measure the heart rate of ...
Hello everybody! Can anyone help me find an infrared temperature sensor with the following features: 1. Ambient temperature over 350°C 2. Temperature range...
Actually, for measuring pulse, I think you might want to check out infrared sensors---google "Pulse oximeter" and you should get some useful hits. Basically,...
The water jet is aimed at a surface about 5mm in diameter, and I need to find a sensor which could allow me to calculate the pressure acting on the surface....
I would look at the sensors, called balances, used to measure forces in wind tunnels. There are probably a lot of good ideas there you can borrow. SherpaDoug...
I think that a simple load cell (waterproofed of course:-)) could also be made into a viable solution for this problem. Regards/Roger, in Bangkok On Sun, Jul...
Hello folks. I am new here so I thought I'd introduce myself. I got notified by this group by an invitation over at edaboard. I'm from Norway, I'm finishing my...
Hi, I am planning a project where, using an ultrasonic transducer, I will emit a 500KHz-ish directional sound wave (sine) and measure the echo. I am not only...
When I did this many years ago in college, estimating the trajectory of a soccer ball by its ultrasonic echoes, I used an FM detector synchronized to the...
Hi, what sort of velocities are you planning to measure? Remeber that the Doppler frequency is given by: f_doppler = 2 * v / lambda_c = 2 * v * f_c / c where v...
Thanks for the input guys. The velocity I want to measure is that of the sea floor. Respective to the transducer, that is. I know that sound velocity is water...
Hey, Sounds like an interesting problem. I have to admit that the electronic part is way over my head, as I'm basically a bit-twiddler. I worked on a project...
Hi, I have had a little think about XOR ring modulators, I have never used one in exactly this way, but I think what happens is that the output from the XOR is...
As I recall I used a Ratio Detector, something like this http://www.tpub.com/neets/book12/51d.htm The AM output of the detector is the slope of the phase...
This is getting interresting. I cannot emphasise enough how great value your input is guys. It's a proven fact that N brains improves the figures of 1 brain by...
I'm looking for an inexpensive pulse oximeter for monitoring oxygen levels in people that has an analog voltage output. Many finger tip clip on styles are...
The comparator to logic method works great in PSpice simulations but I do have a new concern. As of now, the comparator trigger when the signal reaches a...
I'm just worried that noise could double trigger the zero crossing detection, which is why I opted to put a small offset on the comparator. But on closer...
Hi Kjetil, Thanks for the update, I am working on a home science project- I have 5 children and the youngest shows some promise in the field- I wonder... is...
I have never built one myself, but a proton magnetometer sounds like a fun, fairly simple project. Google "DIY proton magnetometer" to get lots of links to...
THanks that is very cool will do ... From: Douglas Butler <sherpadoug@...> To: sensorforum@yahoogroups.com Sent: Tuesday, August 5, 2008 6:03:44 AM ...
Hello Folks, Got back to underwater sound exploration. I've adopted a part of on of the medical RF generators that I'm working on to drive the P319 transducer...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
