Polish Pi

[Mr.Jaick]

answer them. better is 48V onboard voltage battery of a boat, 1000us PULSE WIDTH and Gold Of Atocha you are seeking.

that is crazy mate, 48V?!!
how should i produce that
boost converter might add switching noise to the systems
and i need to isolate the loop drive circuit from other parts, they will get damaged with 48V
i think you're joking me dude

[Mr.Jaick]

by the way i just want to share an interesting strange behavior of my device(maybe normal!)
today i was trying different types of 4011 ICs to see the difference
i have 4 sampels but strangely only one of them worked and produced pulse signal on the output.
others had +VDD on their gates input!
CD4011BE Texas instrument = didn't work
M4011UBE Mitsubishi Japan = didn't work
another 4011BE that i don't remember detail = didn't work
TC4011BP Tushiba Japan = works!

I think the only type that works is "BP" type...maybe

[Mr.Jaick]

I want to make a 50cm coil with 1mm core stranded wire maybe around 15 to 17 turns
not sure what's it's ohm is gonna be about perhaps less than 2 ohms
and i'll use IRFZ46 which is a VMOS with a very low Rds(on)
I've calculated the RGseries resistor to reduce output ringing of the VMOS as well as
Rg pulldown resistor to make sure it'll turn off when input drive level goes down
hopefully it will give me some extra depth, we'll see.
Frequency? how about 240Hz?

Hats down, Fingers crossed, I'll do it.

do you guys have any tips for this Atocha seeker coil ?

[kt315]

that is crazy mate, 48V?!!
how should i produce that
boost converter might add switching noise to the systems
and i need to isolate the loop drive circuit from other parts, they will get damaged with 48V
i think you're joking me dude

huge laziness to search the forum eeeh? dude.

[Mr.Jaick]

huge laziness to search the forum eeeh? dude.

my bad, i searched the internet instead of forum

[kt315]

you searched the internet on Atocha Gold, not on Eric's Foster Pulse The Beast.
your brain will be boiled if you stand inside his coil.

[Mr.Jaick]

you searched the internet on Atocha Gold, not on Eric's Foster Pulse The Beast.
your brain will be boiled if you stand inside his coil.

exactly, the best choice for everyday casual nugget finds(BIG NUGGETS).

[Mr.Jaick]

hi I tried to measure my Delay time(Polones) with a dual channel oscilloscope but i'm not sure if i did it right or not
here are some pictures:
polones schematic just for comparison


V/dev = 5v/dev Time/dev = 1mS
gate of drive transistor, have not connected yet


V/dev = 5v/dev Time/dev = 1mS
pin 10 of 4011, sampling(gate of BF245)


V/dev = 5v/dev Time/dev = 20uS
Falling edge of drive transistor gate signal


V/dev = 5v/dev Time/dev = 20uS
Falling edge of pin 10 of 4011, sampling


look at last two pics it seems they have 120us delay!
or my measuring method is wrong?
I just wanted to know how to measure the delay time and also how to calculate it's value based on those capacitors and resistors around 4011 IC

[surfdetector]

hi I tried to measure my Delay time(Polones) with a dual channel oscilloscope but i'm not sure if i did it right or not
here are some pictures:
polones schematic just for comparison
[ATTACH]53176[/ATTACH]

V/dev = 5v/dev Time/dev = 1mS
gate of drive transistor, have not connected yet
[ATTACH]53172[/ATTACH]

V/dev = 5v/dev Time/dev = 1mS
pin 10 of 4011, sampling(gate of BF245)
[ATTACH]53173[/ATTACH]

V/dev = 5v/dev Time/dev = 20uS
Falling edge of drive transistor gate signal
[ATTACH]53174[/ATTACH]

V/dev = 5v/dev Time/dev = 20uS
Falling edge of pin 10 of 4011, sampling
[ATTACH]53175[/ATTACH]

look at last two pics it seems they have 120us delay!
or my measuring method is wrong?
I just wanted to know how to measure the delay time and also how to calculate it's value based on those capacitors and resistors around 4011 IC

You should put channel one on pin 6 of the LF357 and channel two on pin 10 of the 4011, trigger off of channel two. Set your scope for 5volts and 50uS that should give you a good idea as to what your delay looks like

[Mr.Jaick]

You should put channel one on pin 6 of the LF357 and channel two on pin 10 of the 4011, trigger off of channel two. Set your scope for 5volts and 50uS that should give you a good idea as to what your delay looks like

Thank you man
these little hints teaches me alot, very helpful for learning electronics

[Hammerhead]

https://youtu.be/clRF0f10jfA?t=32

[6666]

https://youtu.be/clRF0f10jfA?t=32

What is he saying about the IC's ?

[surfdetector]

What is he saying about the IC's ?

I believe he is saying that the TL081 works with a 30cm coil and the LF357 and 356 do not, however they work with smaller coils

[6666]

I believe he is saying that the TL081 works with a 30cm coil and the LF357 and 356 do not, however they work with smaller coils

Thanks thats interesting.

[Mr.Jaick]

You should put channel one on pin 6 of the LF357 and channel two on pin 10 of the 4011, trigger off of channel two. Set your scope for 5volts and 50uS that should give you a good idea as to what your delay looks like

I did it
now it seems to me my delay time is 100uS!
channel X on pin 6 of LF357(TL071 in my case)
channel Y on pin 10 of 4011
the top waveform is LF357 and bottom is 4011

volt/div = 10v time/div = 50uS
i played with trigger and trigger source but couldn't make it smaller
what should i do now? reduce the two 33k resistors?