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Hi dear all, Designing a charge amplifier, what primary parameter one should look for? I mean if one has to amplify presence of a few ions? Thanks Zahid

That's what I say, start above the resonance frequency so you donot ramp through, Curt?

Thanks indeed Curt for continued discussion. Zahid

Thanks dear Curt for the post. You say I start like this, the problem frequecy is say, 100 Hz, I apply 200 Hz then the ramping increase from 200 Hz to say 1000 Hz at full speed? What effects the resonance of the motor have on the driver? sincerely, Zahid

Thanks for the reply. This means for a given load condition the starting pulse rate will be slower than when running in normal condition. Secondly would you also please tell me if I can use a NEMA 23 size 7.5 deg/step which takes about 4 millseconds for a step? What parameter should I look for...

Hi! Would someone please answer what are starting pps(pulses per second?) parameter of a stepper motor. This parameter is different than that while it is running? Thanks in advance, Zahid

Thank you dear indeed for this quick chat we had on the forum. I shall work again on my assignment. sincerely, Zahid

I have tried avalanche transistor earlier but high voltage is again another constraint. I am given only 40 vdc. Even while trying the avalanche transistor at 150vdc the lazing I was having was not really loveable? May be the inductance problem you talked now?

This document will be of great help. Thank you dear.

Thanks dear, in fact I have space limitations so was interested to build my own.

Thanks IRstuff for the reply. The pulse current is 5A and repitition rate is 100 microseconds. Diode is 3W pulse laser diode. I would appreciate if some design material is suggested in this regard. Thanks again dear. Zahid

Hi all, I need a 50 nano second LASER pulse to send for 4 meters. What kind of driver is best? Thanks