Search results for query: *

Thank you.

Thanks today I changed configuration as below but the result was not good. remove diode, connect emiter with R10K to -15VEE, chnage 330K to 10K, connect base to -15VEE with R10K, change R150K to 47K only a 1nF cap between opamp output and its negative input reduced noise to 50mv (equal supply...

Thanks All Also before there was a RC(1K,2n2) between collector and base that force circuit to oscilate, other values for C (20p to 100n) didnt produce good results. because of low output impedance of +100V supply source, I have to use this resistances values, but if you think change of...

it drives a piezo - no current need

Thanks Gunnar +100V supply is a nominal label and it is about 126V Could you please send me a good reference design.

hi all my voltage booster circuit {http://john111smith.googlepages.com/vbstr.png} shows the following noise levels: A: <+-50mv B:~ +-200mv at 67v output D:~ 0 OpAmp: OP07 or LM741 How can I reduce noise level at point B to about +-50mv?

Also, there is some produced gas at vaccum chamber during work of system, that change level of vaccum at random events. (Turbo pump works constant.) So, controller via valve must stablize adjusted level of vaccum. I hope the control be simple :) I going to use only final stage [U6/Q1] of the...

turbo pump is always ON. valve is controlled by output 0-100V stage (U6/Q1)

What is your suggestions for optimization or new design of output 0-100V stage (U6/Q1)?

the above circuit extracted from a mono layer old PCB. because of simplicity, I didn't place 10K potentiometers (offset null) of all 741 opamps circuits. and also, RC [1k, 2n4] between B and C of Q1. R37 is 67K7 the ouput is enough to drive piezoelectric voltage controlled valve. if its...

the above circuit extracted from a mono layer old PCB. because of simplicity, I didn't place 10K potentiometers (offset null) of all 741 opamps circuits. and also, RC [1k, 2n4] between B and C of Q1. R37 is 67K7 the ouput is enough to drive piezoelectric voltage controlled valve. if its...

Hi All, I wish you a Merry Christmas and a Happy New Year. I try to use a PID controller instead of an old hardware vacuum controller. While, a turbo pump decrease pressure; a valve connected to the vacuum chamber, increase pressure. What is the equation that represents the function of the...

Hi All, I wish you a Merry Christmas and a Happy New Year. I try to use a PID controller instead of an old hardware vacuum controller. While, a turbo pump decrease pressure; a valve connected to the vacuum chamber, increase pressure. What is the equation that represents the function of the...

thanks but it will not work with LOOK-UP TABLE - input is voltage for gas paffing valve control - turbo vaccum pump run continuously - output is vaccum

This is a valve

58.9 1.00E-06 68.8 1.00E-05 73.7 8.90E-05 78.6 2.00E-04 83.5 6.40E-04 are some of points. at main working area X is between 60 and 80

Hi, How can I set "PID parameters" for the control of the system with the following "power serie" ? y = 3E-40*x^18.94 X min = 30 X max = 90 PID parameters: iMax,iMin, pState,istate,dState, pGain,iGain,dGain, MAX,MIN regards

Nowdays, The high voltage ceramic capcitores provided with coin dimentions. ----------- photomultiplier

I before had an experience in design HV PS. Here I prefer to do it.

If you need a power supply with 2A or more output, it is better to use a Bulk Swich Mode ones. search LM2576 documents. Also, It may have a variable example circuit.