Barracuda Legend Kit Problems

[Old cart]

The board is still in one piece i have removed my soldering iron and i will get another (much better one). Old cart thank you for your patience i really want this to work as we have spent a good amount of time on this i thought all was lost, i don't want to waste all the time that you have put in to help me.

OK the battery voltage is 11.5V

Pin2 CH1 Pin4 CH2 here [ATTACH]35381[/ATTACH]

Well, those are still wrong (perfect measurement, just wrong waveforms). Don't worry about the time, I now have enough time in it that I must carry on. I will try to keep a stiff upper lip! See post 185 for what the sample waveform should look like.
At the moment I am at a loss as to what to do other than trying another 40106. I spent some time looking at your top and board pictures and they look fine. unless you can take even better pictures we are stuck there. It is possible that I could be missing something because I can not read or test resistor/cap values. We could try an in-circuit measurement of the board with the 40106 removed, if you are up to it.
Also, still need to measure the regulator outputs 78L05- 79L05 out pins relative to ground. Use your multimeter but be careful not to short the output.
I also suggest you charge your battery, it is getting low.

[Impulse]

o and the probes are 10X and the channels have been changed to 10X

[Old cart]

Impulse, here is what the sampling pulse (bottom trace) and the 5534 pin 6 signal should look like if it is correct.

http://www.geotech1.com/forums/attachment.php?attachmentid=15859&d=1309516746

Your preamp pin 6 signal is right, the sampling signal is not. In fact all of the signals associated with the 40106 look wrong. Once we get the 40106 working it should be a simple matter to adjust the delay to the correct position.
Cheers,

[Impulse]

The board is still in one piece i have removed my soldering iron and i will get another (much better one). Old cart thank you for your patience i really want this to work as we have spent a good amount of time on this i thought all was lost, i dont want to waste all the time that you have put in to help me.

OK the battery voltage is 11.5V

Pin2 CH1 Pin4 CH2 here

[Old cart]

KT315, have you ever looked at the barracuda gate drive pulses with a scope? If so, what amplitude should we expect? If you have been following this thread you'll see we have some unusual signals.

[Old cart]

thanks for the tip but its too late now i will upgrade at some point but until then i have no soldering iron, i has smashed it to little bits

Well that is a shame.
Electronics, especially when we do it remotely like we have been doing, is hard. It is a tough balance to understand what is known and seen on the other end of the conversation without actually being there. I did this frequently over a 31 year period but there the equipment was some that I was very familiar with.
Take heart that you have not damaged your board.
Do you still want to carry on?

[Impulse]

iron was too hot
---
soldering station

thanks for the tip but its too late now i will upgrade at some point but until then i have no soldering iron, i has smashed it to little bits

[Old cart]

Impulse, welcome to electronics. The repair you did looks fine. Have you been using the scope probes in the X1 or x10 position? If the X1 position try setting them to x10 and probing pins 2 and 4 of the 40106. Don't forget to change the scale factor settings in the scope interface to x10 so the readout will be correct.
I still need the measured battery voltage and the -/+ regulator output voltages.
When you air test disconnect the scope probes as they can interfere.

[kt315]

iron was too hot
---
soldering station

[Impulse]

ok i went over the connections and the soldering iron was too hot and broke the board connections for the delay trim so now im back to square one with a messed up board!


here

[Old cart]

A couple more points the pot goes between the two pads that you can see to the right, and slightly down, from the delay trimmer when to board is held so you can read the lettering on the component side. Ohm between those two pads to confirm 0 ohms resistance. Also reheat all the solder joints on the 40106 socket as well as the delay trimmer . Some of those joints look cold. I don't know if you can make a clearer picture of the top and bottom of the board. Perhaps if you took it outside or used very bright light the depth of field of the camera would increase. What I need is very sharp images to see minute soldering defects. If you have an adjustable camera use small apertures like F5.6 or F8 or even larger. Use a shutter speed of 1/60 or faster if possible. In sunlight this should be easily possible. If you remove the 40106 from the socket you should be able to use to use your multimeter to confirm the components installation and values. Hopefully your meter also measures capacitance. If you do an more boards it is a good idea to install the components one section at time to confirm each section works. For example power supply, transmitter, timing section, etc. of course without a build doc this is tougher.

[Old cart]

Impulse, it would go in series with the delay trimmer in the place where the PCB has a Link between the two adjacent holes. You would have to cut the link with an exacto knife or something similiar and solder the 10K pot there using the center and left pins if they are facing toward you. BUT I don't think this is the problem. The 40106 is not working correctly. The pin voltages should be varying better -5 and 0 volts not just between -4.5 and -5.
Maybe someone who owns a barracuda could verify this.
It seems unlikely you would get two in a row that are not working. It seems more likely you either have a solder bridge, bad solder joint, wrong components, bad components, components inserted backward like diodes, or something similiar. If you have checked all those things then you try replacing the 40106 once again.

Did you ever check the supply voltages as mentioned a few posts above. What is your battery voltage?

[Impulse]

ok i have had another look at the board and the schematic and the only thing that i don't have is the 10k delay pot? was this removed in Rev2? if so where should it go?

[Old cart]

All 5? or the last one?

also the delay trim has a slight affect in terms of amplitude not relative time or position

and by calibrator signal you mean the scope signal?

here [ATTACH]35377[/ATTACH]

That looks fine.

[Old cart]

here is the 1ms trace [ATTACH]35378[/ATTACH]

Thank you, also need the supply voltages. The transmitter and preamp are working pretty well. The sampling circuit is not as best I can tell. Can you compare the schematic values (all the parts connected to the 40106) to the actual ones that are on the board to confirm the parts are in the right place. If that is OK, then we have more work to do.