carrier frequency and output frequency | Eng-Tips 1000 Hz motor frequency at 7 kHz carrier is doable, but be prepared to have some interference between carrier and motor frequencies An output filter could perhaps improve the situation
Litz wire for induction heater | Eng-Tips I need to make up flexible cable for induction heater coil and I would like to work out best configuration of Litz Wire to minimize losses 1 kHz 100 A 1000 mm cable length copper wire Worked out skin depth is 0 21 mm for Cu at 100 kHz should I then use wire of maximum 0 4 mm diameter? Where
455KHz bandpass filter requirement for superhet receiver Hello I have just designed and built the following simple AM superhet receiver and It is just to receive the station on AM 1026KHz The Mixer is a switching mixer and literally just switches the signal on off at 216KHz using a 7555 timer and CMOS 4066 analog switches which are switched via
square wave -- gt;sine using passive bandpass filter | Eng-Tips Hi, I'm designing a circuit that will take a square wave generated by a microprocessor and feeds it through a bandpass filter to get a sine wave The application will be to provide a tone for morse code to a handheld ham radio on board a small satellite Right now im considering remaining
looking at irig b signal | Eng-Tips I am checking an irig b signal which in this case is modulated with a 1 khz signal Being as it is amplitude modulated I would expect a solid 1000 cycle rate to show on the frequency counter When I measure the signal it ranges from 994 hz to 1002 hz, transitioning back and forth at a regualar
CMOS Switch Mixer too simple? | Eng-Tips Also, your local oscillator is 216 kHz? So with a 1026 kHz RF signal your IF is either 810 or 1242 kHz, not 455 kHz Or is that a typo? And some of the components and time constants in the following stage just don't add up for me either And while bypassing the emitter resistors with electrolytics at these frequencies might work
VFD increasing the motor winding temperature | Eng-Tips I tested a 415 V, 350 KW, 2 pole motor on no-load (open shaft) With utility supply at 50 Hz, the motor winding temperature was 64 deg C with 130 A current With VFD supply at 50 Hz, the winding temperature went up to 97 deg C with the same 130 A current The drive is Yaskawa GA 700 model
load reactor temperature | Eng-Tips So at 4 kHz, you can calculate I*I*R Knowing the surface temperature ( you measured it), you can calculate the amount of heat convected and radiated away ( search for websites that give equations for convection and radiation heat loss from surfaces)
Signal Propagation on sea water path | Eng-Tips Hi Is the propagation of a signal on a sea water path faster than that on a all ground path I know that conductivity causes this but what is the equation or theory that explains this effect on speed All literature I have got explains propagation INSIDE the medium (in water, in air) My application frequency is 100 KHz Thanks
Al2O3 laser machining on Rofin CO2 laser machine | Eng-Tips Good day! I have an Rofin-Sinar laser CNC machine with 10 6 um wavelength (60W, 1-100 kHz) and I trying to cut the details (compensators) from 1mm thick sheet (20x40mm) of polycrystalline alumina (Al2O3) But what I have: poly corundum (polycrystalline alumina) sheets have cracks and breaks by