anyone have an idea on how to create a phase delay which is variable. Im not talking the start 180 degree flip flops though, but more like 10-20 degrees. I know this is not that hard to do with a u controller but need to try with standard ICs. A 555 comes to mind but I havent been able to get...
Hello,
I am having trouble with the power consumption by a paired mosfet array chip. The should be simple circuit is attached. The mosfet array (half bridge chip – FMP26 by IXYS) is being switched at 1-2MHz and thus, a 12A pin driver (EL7158) is being used to deliverer more current to the...
Hello.
I need to quantify the amplitude of some vibration and waves we are experiencing. They motion is at approximately 1 to 1.5Mhz has an amplitude in the low micrometer to nanometer range. I understand that this is at the distance*frequency limit for a laser vibrometer. Other options I...
I have a single oscillator which is switching numerous matched mosfets arrays (n and p) in parallel. The circuit works as it was originally intended and is able to drive an ultrasound transducer at 1MHz. This circuit is attached (US_driver.jpg). A more detailed explanation is that a...
I am hitting glass plate with high power ultrasound. The ultrasound pulses are 1MHtz pulsed at 1KHz.
As a by product, we are getting an audible component, a high pitched ringing. As we change the pulsing rate, say over the range of 0.5KHz to 2KHz, the pitch that we hear changes.
Why is...
Hello,
I have a 1 MHtz transducer, being driven in a high intensity pulsing fashion, that being that the 1MHtz signal is being pulsed at 1KHtz. The ultrasound signal is being applied to a borax plate (3”x4”x1.2mm). There is no wedge being used between the transducer and borax (glass) and I...
We have 3to 4 different pieces of equipment running on 230V lines in our building that have got damaged in the last month (all are -80C freezers. Some of the freezers are brand new.
What is the best way to analyze the power? I have a 1000X voltage probe and a few Oscopes and was thinking...
Im having an odd problem with an ultrasound driver and transducer combination. The driver produces a an waveform output from 500hz to 5MHz (tested with 10ohm resistive load) which we are trying to use to drive transducers ranging 500khz too 3MHz (500KHz, 1MHz, 1.35Mhz, 2MHz, and 3MHz) at the...
hello all.
Im working on reconstructing a circuit that someone else made. Im by no means an expert. Im having a little trouble understanding a ringing effect Im seeing.
So I have one mosfet driver driving 4 other mosfet drivers at approximately 2MHtz. These chips have 40MHtz band limit...
so this should be a simple question.
the gain of a op amp in inverting configuation is -rf/ri.
There are many different values of rf and ri can be used set the same gain. How does one practically pick the values.
Im assuming the ri value has to match input or output impedance of the source of...
