Thanks again IRstuff for the link.
The leakage figures are fine BUT I don't think the devices will pass the 700mA required by the circuit when switched ON.
Back to my hunt!!
If someone makes a device with those leakage currents but with a 0.5 ohm ON resistance under normal operating...
Thanks IRstuff.
My thoughts exactly when I got involved in this project.
In the normal world everything you say would be true BUT in the Intrinsic Safety world there is much more to consider.
The end product will be used in an atmosphere which could be explosive. The test gas mixture they use...
You don't specify the current you are passing through this fuse.
In my experience some of the smaller thermal fuses do self heat adding their own contribution to the device temperature.
Another problem with low temperature thermal fuses running at high currents is the connection method.
Often...
Li-Ion battery manufacturers provide protection circuits, which are often built into their batteries.
These are based on special purpose integrated circuits which control one or two MOSFETs to isolate the battery if the terminal voltage is over or under certain specified voltages. The circuit...
This relates to my 50KHz ultrasonics problem, but presumeably relates to all acoustics.
1. A transducer can convert electrical energy to acoustic energy.
2. Another transducer converts acoustic energy to electrical energy.
I can build a driver with a flat frequency response for the first...
Surely all you need is a 5.1 volt zener or an electronic precision shunt regulator across your 250R resistor.
When the voltage reaches 5.1 V the shunt device will start to conduct. It will shunt pressure transmitter current in excess of 20.4 mA around the resistor. The spec for the...
Might be stoneage but a pendulum fixed to the shaft of a qood quality rotary potentiometer gives an output which you can scale to whatever FSD you want.
Mount two such units at right angles and with a bit of computation you can calculate the two dimensional tilt.
Put it all in a bucket of oil if...
Thanks acadien
Trouble is, if we go down this route, we could need a steady supply and E-Bay is not ideal for scheduled supply!
Somebody obviously makes cheapo light guides for all these fancy lights and Xmas trees, but so far my web searches have only found distributors for high grade data...
Thanks for that info.
The frequency does shift with temperature and not surprisingly the temperature rises due to the 30 watt input.
I will start searching the data base!
Thanks again
Electricliff
Thanks nbucska.
That was my first thought and the first attempt.
Unfortunately it would need to be a power oscillator because the drive requirement is about 30 Watts.
Have used a power amplifier to drive the piezo element and find that at 56KHz we get the desired activity in the specimen...
This is hardly a technical question, but someone in your group might know the answer.
I am located in the UK.
I need to pipe light over multiple paths which vary from 1 to 5 metres.
The exit aperture for the light needs to be about 2mm.
The budget is a bit limited.
Where can I source a reel of...
The same can been true for many chip pins marked NC.
In this case the NC doesn't always mean that the pin is NOT CONNECTED it often means DO NOT CONNECT!!!
So check before using a NC pin as a convenient route for a PCB trace.
I once spent many hours debugging a circuit which had worked fine in...
I have on my bench a stainless steel plate with a piezo ceramic transducer (50mm diam 5mm thick) bonded to it.
I need to build an efficient driver to pump power at 50KHz into the device. The end product will deliver ultrasonic energy into a glass container to excite particles suspended in a...
