Delta Pulse

[Max]

good day to all. I am realizing the deltapulse. is possible to replace LF357 with LM318? Thanks for the answers
excuse my english

Hi,
directly ? you can...pinout is about the same (though balance stuff different...) but I think is not so good idea...

though 318 has high slew rate it's not so quiet as an 356 or 357 could be... so test before install... you could lose "some" stability.

Kind regards,
Max

[Unregistered]

Hi,
directly ? you can...pinout is about the same (though balance stuff different...) but I think is not so good idea...

though 318 has high slew rate it's not so quiet as an 356 or 357 could be... so test before install... you could lose "some" stability.

Kind regards,
Max

thanks, I try LF356!!!
excuse me it's possible change TL062>TL082?

[1843]

Hi all,
How much is the total gain of the following circuit...?
(When the switch is open and when it is closed)



Thanks in advance,
1843

[amtech2005]

Delta Pulse

Hello 1843 , Now is the right time for us to answer you , last time I checked there was a Record 650 users here on Geotech Today !!! Any way the CD4066 Quad bilateral switch ON the gain should be at zero on the TL062 Linear JFET. With the CD4066 Switch off gain of the TL062 will be at 10 or so.Whats between pins 1 and 2 and pins 6 and 7 determine your TL062 circuit gain. For me , having test equipment is much easier than writing formulas and equations........Anyone else is welcome to comment here !!!! Take care all ........Eugene

[1843]

Thank you Eugene, The secret of deep detecting of Deltapulse is that section... I think that the gain must be much much higher... +10000(?!)

It is confusing for me... The D7B has two R_feedbak with diode coupled... don't know anything!!!

Kind regards,
1843

[amtech2005]

Delta Pulse

1843 , Gain of 10,000 seems high , that is why a 2nd opinion is very Welcome here right now. Delta Pulse is a very Good Detector . Did you see the videos on "utube" from a Technician called "Elbombaci" ??? Go to utube and on the search , type Delta pulse !!....Have a good Day....Eugene

[Fred]

Because of the capacitors, the gain should be frequency dependant, so your question is not easy to answer...
the best would probably to make a simulation on LTspice or something...
Regards,
Fred.

[ivconic]

Because of the capacitors, the gain should be frequency dependant, so your question is not easy to answer...
the best would probably to make a simulation on LTspice or something...
Regards,
Fred.

This is true.
I noticed gain differs when freq. range is wider like from 90 to 250Hz. Made compromise somewhere at 120Hz, due using large coils with DP.
Yes DP is excellent PI detector.

[Geo]

Yes ... But.... No special differences at frequency change. I work myDP at 400Hz with 20... 60cm coil and at 100Hz with coil 1x1 m. I did not saw differences at the general performance. The problem of the DP is the first stage. If you put the sens at max then the gain is highter but the performance is lower (maybe from the noise...). I tried a lot of times to give it more gain but without results.
The only difference is that at 400Hz the detector is more quick
Regards

[kt315]

worldwide spread people, I give you right diagram. fix your data archive on Delta Pulse.

yours

[Geo]

worldwide spread people, I give you right diagram. fix your data archive on Delta Pulse.

yours

The 3th waveform is wrong. Delay timing is 30 to 110 us. All the other are about the same

I attach the timing of my DP
Regards

[kt315]

The 3th waveform is wrong.

Geo , you specificly have another schematic
can you give me your O-scope screen shoot?

thanking in advance.

truly yours

[Geo]

A lot of times i gave here my O-scope screen shoot!!
Why you don't believe me???
Where are your O-scope screen shoot ?????
Do you see normal the first sample delay to be between 90... and 170 us???
I made the test a lot of times and the first sample delay (tr4) is between 30 and 110 us.
If you don't believe try it

[kt315]

Geo, I HAVE meeted MUCH mentions by people writing the diagram is WRONG! PLEASE BE MORE OBJECTIVE! DO NOT FOOL HERE PEOPLE!

View My Video

happy day tomorrow

[kt315]

updated