Analysis this schematic

[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]

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

[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

[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 dear Davor
can i use LM5534P(NE5534P) instead ne5534?

[porkluvr]

LM5534 and NE5534 are not at all the same. They're not even close. LM5534 is not an opamp, and it does not have eight pins.

WHY don't you "Google" search these devices, pull up data sheets, and then make comparisons for yourself? You can learn by looking at data sheets, and there is a lot to learn.

[Davor]

NE5534 is not at all uncommon, so just find it. It is a very popular chip and not expensive. Good substitutes of NE5534 are more expensive. Just find the chip.

[mohandes]

Thanks Davor and porkluvr
ok i search and find it,if i can not finish the ps g detector ,what is your idea ?means that what i can make?

[porkluvr]

What treasure do you search for?

Hammerhead 1 is very nice and simple, but make sure you can get the parts before you commit yourself.

Although it calls for NE5534, Carl designed Hammerhead with a universal offset-nulling scheme. That means you could try many other opamps regardless of whether the null pins are the same... because those pins aren't used. You would want to use a reasonably fast and quiet opamp, something like LF357 maybe, or OP37. But can you find 74HC221 and the other required parts, in your country?

Hammerhead 1

Hammerhead, Surf PI, and Baracuda, are all reasonably simple.

Do you make printed circuit boards or do you need to purchase?

[mohandes]

HI porklur
i design my pcb for ps g , and all work i do for make this,i check alot pcb conection and ect for find my error but i think my error in my lf357.i change pin5 and pin8 lf357 toghter in my pcb,tomorrow i will go to collage and check all conection by oscope
I finish 4 pcb and set part but i am going to check all Step by step.my first pcb (power suplly) work well and i finish that about 3 weeks ago,but the second pcb that i put the picture dosent work well , i want finish it but i dont know my problems exactly.

thanks and regards

[mohandes]

ok i put pictures

[mohandes]

[mohandes]

Hi georgi and all
ok finally i think give true resuts, but i can not understand why i dont see 600 or 700 volts on ifr740,look at the pictures,please
if ther are ok say to me, my oscope is 100MH

[mohandes]

an other questuon about pin3 of ne5534.is it true?(or D3 and D4)
ok say to me if i have an error.

[mohandes]

ok the last explain for The remaining picture discipline:
1-pin3 555
2-pin 9,10 4053
3-pin11 4053
4-pin6 4538(first 453
5-pin10 4538(second )

























thanks