Building Wolf Treasure [Tesoro Lobo]

[Ruben2000]

I have noticed that some have run LOBO with these changes.

[kt315]

What will be the right thing to do?
----
10-100pF

[Ruben2000]

What will be the right thing to do?
----
10-100pF

Thanks KT for the help !!!

[Ruben2000]

Will the waveforms be okay?

[kt315]

how i see this sch... you have to get CLEAR symmetric signal on output of 555... to get then sinusoidal voltage
on the coil without a distortion and harmonics...
we call sometimes this signal "meander"... in last redaction, TROY SHADOW X5 i mean,
the author input a trigger after 555... it gives sure clear meander.
try to tune now...

[Op04]

Hi Ruben,
You must see this GoodLuck with your project!

[Ruben2000]

Hi Ruben,
You must see this GoodLuck with your project!

Thanks for the link op04 !!
I had read it before, I don't know if Max was able to get Lobo to work properly.
There are various Lobo schematics all over the web, but so far I haven't seen anyone posting all the correct information about Lobo.

[Ruben2000]

how i see this sch... you have to get CLEAR symmetric signal on output of 555... to get then sinusoidal voltage
on the coil without a distortion and harmonics...
we call sometimes this signal "meander"... in last redaction, TROY SHADOW X5 i mean,
the author input a trigger after 555... it gives sure clear meander.
try to tune now...

Hi KT,
You mean there must be a 50% high and 50% low signal at the output of the 555 and no interference?

[Op04]

Thanks for the link op04 !!
I had read it before, I don't know if Max was able to get Lobo to work properly.
There are various Lobo schematics all over the web, but so far I haven't seen anyone posting all the correct information about Lobo.

Dear Ruben,
My point on that link is Mr.Tchoci progress, he reveals his made with different coil and components also PCB error correction. There also Legaucho work on lobo with working PCB of began this page

[kt315]

i think connections of those resistors are mistake.

[Carl-NC]

i think connections of those resistors are mistake.

Probably not, they bootstrap the on/off logic levels to the analog signal.

[dom44]

I am working on this detector my self still at the setting up stage works great so far, I need to try with the resonant receive coil with 600hz spacing between transmit and receive coil for correct phasing.

[Emersonpaz]

Hello friends I am wondering why leave this 600Hz spacing between TX and RX? Why can't they be at the same frequency?

[Ruben2000]

I am working on this detector my self still at the setting up stage works great so far, I need to try with the resonant receive coil with 600hz spacing between transmit and receive coil for correct phasing.

Hello dom44.
Are you running it at 17500Hz and 18100Hz?
What capacitor do you use in C7?

[dom44]

i set mine up for exactly 20khz on the transmit coil so will set the receive coil for 20.6khz i wound my own coils so was easy, I have 1.43mh on the Tx and 9.68mh on the Rx and i have 47n cap on Tx
I am starting with 10n on C7 as i said i have not finished with the final setup but so far has exhalant sensitivity with an un tuned receive coil. there is an LT spice simulation some one posted here a few years back on the lobo front end so you can play with part values.