Analysis this schematic

[porkluvr]

Mohandes,

All the measurements you described look OK so far as I can tell.

I gather that your PCB was designed from Alexi's schematic drawings. I won't ask you which schematic you used any more.

Here is a screen shot from a simulation of the timer and tx subcircuits. (You should disregard my reference designators i.e. U1, R1, C1, etc. because they do not correspond to your drawing.)
Pulse positions correspond to having your potentiometers set at ~50%.

If you need something else probed in this circuit let me know and I'll try to accomodate.

What the pin-14 discriminate pot does is change the pulsewidth of your secondary sample pulse, sb. With the components shown on Alex's schematic the secondary pulse would range about 47us~147us, depending on discrimination pot setting. In the simulation the R value corresponds to ~50% pot setting, and although it might be hard to see, the sb pulse is about 100us wide.

edit: Two posts were made in the time between I started making this post and the time I finished. I have not had time to absorb the meaning of Mohande's latest problem report.

[porkluvr]

Mohandes, do your SA and SB pulses look right in relation to the 555 pin-3 signal? If so, then your 555 and the two 4538s are probably operating correctly.

[mohandes]

my dear friend porkluvr
ok i want put my pictures (for today)but i can say for you v(tx) is ok,v(sa)is ok,v(sb)not good but i dont know i can adjustment that by discrimination again measure that tomprrow,and v(sc)like #106.

just a question you say put all potentiometers set at ~50%, should adjust pps and pw and do you adjust them,

If you need something else probed in this circuit let me know and I'll try to accomodate.

ok my friend i think my pcb have not error and again measurment and thanks for your wonderful work and simulation,ok please take for pin3 & pin6 ne5534,pin6,7,9,10 U3 and pin6 4053 .
if need i put my new images,
thanks and you Hope me and i can not rum figure in scope so need help you,thank you very much

[mohandes]

Mohandes, do your SA and SB pulses look right in relation to the 555 pin-3 signal? If so, then your 555 and the two 4538s are probably operating correctly.

ok tomorrow check it
thanks

[georgi.g.zhelev]

ok tomorrow check it
thanks

mohandes , You understand ? STEP BY STEP!

[alonejax]

Hi porkluvr

how are you my friend?
i so happy when you'r here..

[mohandes]

mohandes , You understand ? STEP BY STEP![ATTACH]24616[/ATTACH]

Hi mr georgi my friend
how ever i measure all and say my problem today i measure number that you certain,and put for you by this names.
i think this is good idea man.
and i know step by step and measure all point but when i dont know how solve my problem (or maybe correct and i cant analyse my figures)
but a few time ago i connet all my pcb and work but the discrimation not work (just green led become ON)and the deeps on the air by my coil(370Uh)near 5cm .
thanks

to night i send my result and i just can say thanks for all guru and you georgi

[porkluvr]

how are you my friend?
i so happy when you'r here..

I'm tired. Too much to do, and not enough time to do it.

Thanks for your consideration, and I hope you have your DP working very well.

[porkluvr]

Thanks for those tips, georgi. Maybe when mohandes gets past the timer section you will help him with setting up the summer/integrator channels (I hope, I hope).

my dear friend porkluvr
ok i want put my pictures (for today)but i can say for you v(tx) is ok,v(sa)is ok,v(sb)not good but i dont know i can adjustment that by discrimination again measure that tomprrow,and v(sc)like #106.

just a question you say put all potentiometers set at ~50%, should adjust pps and pw and do you adjust them,

I do not think I said for you to put your pots at 50%, but that is what my simulation did, and it probably is a good idea for starters. The pulse timing formula for CD4538 is simply t=RC so there is not really any need to simulate at more than one pot position. To do the math is simple.

Signal sc is the (inverted) sum of sa and sb.

The 4538 Q and /Q signals are complementary outputs (pins 6,7 and 10,9). As one goes high, the other one goes low, with a duration according to the timing formula.

If you probe sc and determine that its duration does not equal the sum of sa and sb, then you should make sure the two diodes are oriented correctly.

When I said I might accomodate your requests for probing "this" circuit, what I was referring to was what I have already drawn. I have other things to do besides add more components to the simulation. It is what it is.

Download LTspice here:

Learn to use the basic LTspice program. You can get the CD4000 components library by first joining the LTspice Yahoo group, then download the CD4000 parts library from the Files section. I will help you learn to use the CD4000 library (and also LTspice) if you request, but I can't learn it for you. And I will not send you my simulation file because I would also have to send my modified CD4000 models and symbols libraries, for it to be of any use. That is very time consuming. And then you would be bombing me with questions because it involves advanced concepts. Please learn to use the basic program first.

http://tech.groups.yahoo.com/group/LTspice/


NE555 is included with LTspice.You could maybe start to learn to use the basic program by building the 555 transmitter section!

[mohandes]

hi guru
look and give your opinion
look ,i work like said in your picture,again step by step
this is step by step,just secon picture for pin6,11,10 frist 4538
step1,step2,3,4,5,6

[mohandes]

and Continuation
step7,step8,step8-1,8-2

[mohandes]

ok the finally
step9,step10,step11,(i forgot take picture of step12 but it is yet bad )
and another picture after step11 are for drain of irf740

[mohandes]

Hi
this figure for wave of GND and pin6 ne5534.
mr porkluvr
i return multitern(discrimination)and sb dont change ,also sa and sb dont change when the output of 555 is changing.BECAUSE i am sure my problem in U3(second 453
you say maybe one 4148 destroyed but when in pin 9 second 4538 not output how is it work?

i put my picture step by step and waiting.
thanks

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[porkluvr]

Hi
this figure for wave of GND and pin6 ne5534.
mr porkluvr
i return multitern(discrimination)and sb dont change ,also sa and sb dont change when the output of 555 is changing.BECAUSE i am sure my problem in U3(second 453
you say maybe one 4148 destroyed but when in pin 9 second 4538 not output how is it work?

i put my picture step by step and waiting.
thanks

It is really hard to analyse what you have. Too much, umh, information.

Please, it would be helpful in the future if you turned the oscilloscope intensity down a little bit so that the scope trace is not so bright and blurry. I know your camera has some blurriness, but turn down the scope intensity.

Listen up, this is important:
You MUST take advantage of the oscilloscope having two channels. Use two probes, one for each channel. It would be informative if the scope be set to trigger off the signal on ch1. The ch1 signal trace position should remain stationary. Then, whatever is probed on ch2 can move left or right (as you turn the pots) and be viewed in temporal (time) relationship to ch1. Otherwise, you cannot see temporal relationships because you have no temporal reference.

Otherwise if you use only a single channel, while you can see if a pulse gets wide or narrow, you will not be able to see if one pulse is moving in relationship to another.

When you use two channels then you will be able to watch relative movement between the two signals being probed. So... if you only have access to one single probe, then you really do need to beg borrow or steal, to obtain another one!

Time out, and I'll look at what what you posted to see if I can see anything telling.

[porkluvr]

I have reconsidered my last post. I suppose you have your hands full, trying to follow the signal flow on the PS-G.

Just do what you can with a single probe. But, understand that you are losing a huge portion of your test instrument's functionality by doing so.