Bulgarian 'PULSE STAR' (... close to Legendary one)

[mohandes]

I'm not a qualified design engineer but I'm going to say this anyway:
Good "high speed" PCB design cannot happen by accident. On this PCB, much too little attention is paid to keeping the input signal traces short and direct.

Look at how much distance is between U5-3 and D5. Also, look between U5-2 and R21.
Components at the + and - opamp inputs need to be located as close to the input pins as is possible or else what you will see on your oscilloscope will likely be a mess.

edit: Also, the feedback path between pin-6 and pin-2 needs to be short and direct. Here that signal path has a long meandering path; very bad. Look at the C17 path. This is by no means a complete list of things that very badly need changed.

Never mind whether or not the schematic design is viable, those long trace length are probably killer defects, plain and simple.

thanks man for your attention and your VERACITY.
ok
i finish the second part and today try to adjust the TP point.
when i want adjust TP3 ,it have very ripple(-2v to 2.5 volt,goes up and down)
i check the third pcb and next fix it.
oh ! my 5534-6 is ok?(can be better?)
thnks

[porkluvr]

I'm not a qualified design engineer but I'm going to say this anyway:
Good "high speed" PCB design cannot happen by accident. On this PCB, much too little attention is paid to keeping the input signal traces short and direct.

Look at how much distance is between U5-3 and D5. Also, look between U5-2 and R21.
Components at the + and - opamp inputs need to be located as close to the input pins as is possible or else what you will see on your oscilloscope will likely be a mess.

edit: Also, the feedback path between pin-6 and pin-2 needs to be short and direct. Here that signal path has a long meandering path; very bad. Look at the C17 path. This is by no means a complete list of things that very badly need changed.

Never mind whether or not the schematic design is viable, those long trace length are probably killer defects, plain and simple.

[mohandes]

What did you design differently ? other than C13 between pin 5 & 8

hi
look at my design(not good)
in this design i use 2 cap betweeen 1-5 and 5-8 , but i use just c13 in 5-8.
may be better figure in pin6 ne 5534?or it is good?

[6666]

i design again second board(oscillator) part of ne5534.

What did you design differently ? other than C13 between pin 5 & 8

[mohandes]

Congratulation

HI all guru
first thanks : Mr Georgi ,Mr Davor ,Mr Tepco , particularly Mr Porkluvr and Mr Carl Mr kt315 Mr 6666 and ....all my frined.
i am not sleep last night to solve my problem and now it is ok (i think )
i design again second board(oscillator) part of ne5534. i finish it and connect to my old board and I AM SO HAPPY.

please check my pics ,and tell me is ok or not.
i use C13 between pin 5 & 8.

[mohandes]

hi all
i want replace the ne5534 by op27 or lf 357.
any one an put the scchematic this ic for psg (offset point and where c13 connect)
thanks

[mohandes]

for last ? :
i put c13 in pin 1-5 or 5-8 ?
thanks

EDIT :
i do every thing but yet not ok ne5534-6(i use cap10pf in pin 5-8 and 5-1 together).
can you put figure ne5534-2 and5534-3
my coil is 450volt p-p the out put yet have ripple.
??????????????????!!!!!!!!!!!!!!!!!!!!!!!!!!
regards
to be continued ....

EDIT again :
i think ne5534 similar to op27 in offset points??

[georgi.g.zhelev]

hi georgi
i think my waves are ok
look this image.
one of them is delay (yellow)and another vc-T6
all is ok i think if it does not i change that you say.
please put for all your pics psg detector about ne5534-6
[ATTACH]26250[/ATTACH][ATTACH]26249[/ATTACH][ATTACH]26251[/ATTACH]

NO,NO,NO!There is nothing better. COIL = 350...500mkH ! True diagrams > SEE # 515!! , waveform #10 ,# 7, #9. #11 .Do you understand ?

[georgi.g.zhelev]

SEE # 515 !

[mohandes]

mohandes,fengzhai01, change R20 =1,5 M > 1M ; NE 5534 does not work well ! Change: OPA 134 , LF357, OP27 ( NO OP37). look there is a difference in the placement of the pins !

hi georgi
i think my waves are ok
look this image.
one of them is delay (yellow)and another vc-T6
all is ok i think if it does not i change that you say.
please put for all your pics psg detector about ne5534-6

[georgi.g.zhelev]

fengzhai01 , Please show your schemes to PULS STAR-G . (the diagram that you have done your PCB)

[georgi.g.zhelev]

Pulse star , original shematic :

[georgi.g.zhelev]

mohandes,fengzhai01, change R20 =1,5 M > 1M ; NE 5534 does not work well ! Change: OPA 134 , LF357, OP27 ( NO OP37). look there is a difference in the placement of the pins !

[6666]

It would be interesting to find out why the designer of the schematic changed the frequency compensation and off set configuration from the data sheet ?

[fengzhai01]

I have change the NE5534 is OP27, other unchanged, that there was no ringing waveform, looks good, adjust the output is zero, but still is not enough stable, sound is a bit messy