Analysis this schematic

[Davor]

You should get friendly with your scope, but I already mentioned on the other topic that PC scope is too slow for PI.
Your rig will not work good with lf357, find NE5534!

[mohandes]

Hi to all
davor i can not measyre the voltage by the oscope program?and can not measure the small value, why?
mr georgi i measure by this oscope(in computer) and my results is good but i dont know why the lf357 not work well?

thanks

[mohandes]

sorry manmy frist problem is i have not oscilloscope , and second problem is iam not good student but ok, i will make oscilloscope by computer and send for you my results.and other problem is in my city( live in Iran and my city is Mashhad) have not Low Sales parts example ne5534 and lm2940 ,...and i should be go another city and buy it.georgi i am not perfect but you know when you have not measurment instruments this problem become much.ok when i measure by oscilloscope i put my result but i need to your helpthanks

[georgi.g.zhelev]

Hello georgi
why when i adjustment other potentiometer pin6 lf357 have variable value?????for example when i adjustment potentiometer 100k and potentiometer 10k(delay) and potentiometer 50k output change?
and in pin 10 U3(453 i have Fixed value and it -1.6mv?

mohandes , This is your first MD? Where you live ?
I'm tired, I'm not a teacher, sorry .

[mohandes]

Hello georgi
why when i adjustment other potentiometer pin6 lf357 have variable value?????for example when i adjustment potentiometer 100k and potentiometer 10k(delay) and potentiometer 50k output change?
and in pin 10 U3(453 i have Fixed value and it -1.6mv?

[porkluvr]

Hi,porkluvr! SОRRY. (#25 )this is not about you, it's about mohandes .sorry for the mistake ,excuse me.ОК?

You've got your hands full. Apology accepted.

Just let me say this, for what it's worth...
There .... Is .... Noooo ..... Hope!

[georgi.g.zhelev]

Georgi, if that's the way you feel about it, then why does the Pulse Star schematic show the NE5534 being used, and with an offset-null scheme that would NOT work with the LM357?

I think my eyes are open but I question whether yours are.

Hi,porkluvr! SОRRY. (#25 )this is not about you, it's about mohandes .sorry for the mistake ,excuse me.ОК?

[mohandes]

LF 357 ( slew rate = 50 V/мks) works better than 5534 (from my experience).OPEN YOUR EYES , read carefully !! Ofset (trimer 47k) LF 357 ...pin 1 >pin5 ; NE 5534 ofset pin 1 >pin 8 , setting : pin 6 =-0,2V (no target to coil !)

Hi georgi
thanks,i repair that.i adjustment that by potentiometer 47k ,but i think have ripple in pin6 lf357 because have -0.2to -0.22v, can i waiver this ripple?
and in my photos i write wrong about name of output but now when i adjustment the lf357 have 5mv for x , 167mv fory , 160mv for z correct?
if you dont guide me i can not repair that .
and in pin 3 555 ihave -10 volts and correct that?

thanks

[porkluvr]

Georgi, if that's the way you feel about it, then why does the Pulse Star schematic show the NE5534 being used, and with an offset-null scheme that would NOT work with the LM357?

I think my eyes are open but I question whether yours are.

[georgi.g.zhelev]

LF 357 ( slew rate = 50 V/мks) works better than 5534 (from my experience).OPEN YOUR EYES , read carefully !! Ofset (trimer 47k) LF 357 ...pin 1 >pin5 ; NE 5534 ofset pin 1 >pin 8 , setting : pin 6 =-0,2V (no target to coil !)

[porkluvr]

this is lf357 if it is not correct tell me to buy NE5534,it is my problem because i should go to other city and buy it

You need to use NE5534. LF357 will not work correctly in this circuit.

[mohandes]

this is lf357 if it is not correct tell me to buy NE5534,it is my problem because i should go to other city and buy it

[mohandes]

ok and hi georgi
tomorrow i again go to my collage and check by oscilloscope.i put for you pin6 lf357(instead of ne5534 ,correct it?)
when i measure drain of irf740 by multimeter i can change the value of drain and pin6 lf357 by potentiometer 100k As follows:
1-drain irf740 -0.36v ,pin6 lf357 become 6.05v
2-drain irf740 -1.21v, pin6 lf357 become 5.17v
3-DRAIN IRF740 -0.7v , PIN6 LF357 BECOME 5.71v
ok i think i adjustment on number3 and it is ok but why i get in oscilloscope -11.6v??????
why my result is negative?
and the out put x,y,z correct?
thanks

[georgi.g.zhelev]

PS-G

See diagrams.

[georgi.g.zhelev]

Hi to alli take photo and need your help?what is my wrong?pleasemy problem in bd140,pin3 ne555 i have-10.35v but it should be 10v(i think), drain of irf740 600v by oscilloscope & any my ? in last numbers.thank you

Give me picture to signal pin 6 NE 5534 (NO 5532!!!)