Compadre Schematics

[ms.nomi]

Michal, you can do a converter on 44 Volts, turn to TX stage and knock out by depth us.

truly yours

I make external battery box with 3x LION battery = cca 12.5V

why 44V ?

BR

Michal

[simonbaker]

Hello - my modify Tesoro Compadre

Depth detection with this mod increasing:

9V ....... 1EUR ...... cca 25-27cm/air
12.5V ... 1EUR ...... over 30cm/air

Tested and 100% work

With 12.5V need stabil. 9V for suplly power box.
12.5V is only to TX section.

Sorry my bad english


Michal

My new Compadre maybe gets 13 cm (5 inches) in air with American coins -- how in the world do you get 25 to 30 cm? Wow. What do you get with unmodified detector? Which mods give you 25 to 30 cm depth?

[Max]

My new Compadre maybe gets 13 cm (5 inches) in air with American coins -- how in the world do you get 25 to 30 cm? Wow. What do you get with unmodified detector? Which mods give you 25 to 30 cm depth?

Hi,
if you read above you'll find:

"
Depth detection with this mod increasing:

9V ....... 1EUR ...... cca 25-27cm/air
12.5V ... 1EUR ...... over 30cm/air

Tested and 100% work

With 12.5V need stabil. 9V for suplly power box.
12.5V is only to TX section.
"

So... just change the TX voltage and you gain easy depth, but do it just if you know what you are doing... making mistakes is not reccomended on original boards...it's at your own risk.

If you put more voltage there... you'll get higher peak-to-peak voltage at tx sinus wave, so higher magnetic field too, that's why you can gain depth this way. Putting 12.5V there means you got something around 24Vpp at tx that's fairly hi voltage for a tx oscillator that normally runs at less.

You have now just 10Vpp in original compadre... so having 24-25Vpp means you increase get 150% (about) more power on your tx coil.

Kind regards,
Max

[simonbaker]

Hi,
if you read above you'll find:

"
Depth detection with this mod increasing:

9V ....... 1EUR ...... cca 25-27cm/air
12.5V ... 1EUR ...... over 30cm/air

Tested and 100% work

With 12.5V need stabil. 9V for suplly power box.
12.5V is only to TX section.
"

So... just change the TX voltage and you gain easy depth, but do it just if you know what you are doing... making mistakes is not reccomended on original boards...it's at your own risk.

If you put more voltage there... you'll get higher peak-to-peak voltage at tx sinus wave, so higher magnetic field too, that's why you can gain depth this way. Putting 12.5V there means you got something around 24Vpp at tx that's fairly hi voltage for a tx oscillator that normally runs at less.

You have now just 10Vpp in original compadre... so having 24-25Vpp means you increase get 150% (about) more power on your tx coil.

Kind regards,
Max

Thanks for clarifying. I thought maybe you had other mods as well. Your unmodified Compadre seems to go a lot deeper than mine, but I don't have any Euros to test with, just American coins.

Can you do a test with American coins and the unmodified voltage (9v) so I can compare my depth with yours? I would appreciate it greatly.

Cheers,

SB

[Max]

Thanks for clarifying. I thought maybe you had other mods as well. Your unmodified Compadre seems to go a lot deeper than mine, but I don't have any Euros to test with, just American coins.

Can you do a test with American coins and the unmodified voltage (9v) so I can compare my depth with yours? I would appreciate it greatly.

Cheers,

SB

Hi Simon,
sorry I haven't Compadre... just know that things cause I've made bandidoII and golden-sabre... so know about weakness of oscillator power and effects of rising the power there.

I assume data are correct cause they are really close to what I expect from a circuit like compadre, but never tested one.

I think you can compare results with 1eur coin using some other bimetallic coin with diameter of 23mm, made of nickel alloys.

Extern ring of 1eur is something 65%copper, 25%zinc and 10%nickel; inner is something more nickel... formerly is CuNi25 alloy... but I think the nickel percentage is more than 25%... rest is copper.

Don't you have nickel coins there ?

Kind regards,
Max

[Steve in MS]

Thanks for clarifying. I thought maybe you had other mods as well. Your unmodified Compadre seems to go a lot deeper than mine, but I don't have any Euros to test with, just American coins.

Can you do a test with American coins and the unmodified voltage (9v) so I can compare my depth with yours? I would appreciate it greatly.

Cheers,

SB

Hi SB,
I think a more easy way to gain a little depth would be to turn up the sensitivity pot on CB some, that should help some, I know it did on mine.

[simonbaker]

Hi SB,
I think a more easy way to gain a little depth would be to turn up the sensitivity pot on CB some, that should help some, I know it did on mine.

Is that the "VR4" trimmer pot shown mentioned above? Did you just open the case and adjust it yourself? Or did you mount a new pot on the case?

When adjusting sensitivity, what test procedure did you use to decide on the best setting?

Thanks,
SB

[simonbaker]

Hi Simon,
sorry I haven't Compadre... just know that things cause I've made bandidoII and golden-sabre... so know about weakness of oscillator power and effects of rising the power there.

I assume data are correct cause they are really close to what I expect from a circuit like compadre, but never tested one.

I think you can compare results with 1eur coin using some other bimetallic coin with diameter of 23mm, made of nickel alloys.

Extern ring of 1eur is something 65%copper, 25%zinc and 10%nickel; inner is something more nickel... formerly is CuNi25 alloy... but I think the nickel percentage is more than 25%... rest is copper.

Don't you have nickel coins there ?

Kind regards,
Max

Ok, I'll melt down some nickels .

- Do you think it would be possible to use an audio transformer to boost the coil voltage somehow instead of new power supply?

[simonbaker]

Hi Esteban,

red switch? What func?
value for red rezistor?

(tesoro compadre schematic)

Thanx

Michal

Sorry my english....

Yes, Esteban, can you explain what the red switch does and what the value for the red resistor is?

- Also, is the "slim-line coil connector" for interchanging coils?

- Do you know what coils are compatible with the new Compadres, or what mods would be necessary to change coils?

Thanks much
-SB

[Max]

Ok, I'll melt down some nickels .

- Do you think it would be possible to use an audio transformer to boost the coil voltage somehow instead of new power supply?

Hi,
impedance matching ? Yes is possible, but sure it's not the best way to gain depth. Driving the transformer will lead you to other problems cause you will need more current to energize the magnetic core otherwise your colpitts oscillator at tx will simply die cause of too hi current required... and if you use e.g. ferrite core you'll probably have problems with magnetic hysteresys too: to do this , then, you must redesign the TX stage and maybe use a different approach than the colpitts used by guys at Tesoro.

A good impedance matching can maybe give enough field gain to have a good increase in performances but I think this is really overcomplicated to achieve just using a ready made audio transformer... much like a CaptainCrunch's (*) adventure... I will not advise you do so: better trying with power supply mod... easier than modifing the oscillator. Similar stuff I do, usually, when under irish wiskey... the oscillator mods I mean.

You can, for example, buy a prebuilt switchmode power supply module to get the 24V from lower voltage batteries and then try to mod the unit... or you can also build yourself if have required skills. Some simple SMPS really easy are made around the old IC 78s40 controller... really easy stuff... an inductor... and few spare components and you'll get 24V from e.g. 9V or 12V and with enough current to power more than a single compadre.

Kind regards,
Max

(*) for those who ignore who is CaptainCrunch... he is (not a superhero ? well... yes he was/is! really a pioneer of that stuff...) the phoneline hacker/phreaker that fooled AT&T using the whistle he found in a box of Cap'nCrunch cereals... dialing to the world for a bunch of dollars...

[Steve in MS]

Is that the "VR4" trimmer pot shown mentioned above? Did you just open the case and adjust it yourself? Or did you mount a new pot on the case?

When adjusting sensitivity, what test procedure did you use to decide on the best setting?

Thanks,
SB

Just advance the pot setting for more sensitivity so that it is still not too noisy. I have the newer Compadre, it is the pot at the top of the CB if I remember correctly.

[simonbaker]

Thanks Max and Steve for the answers.

- Any advice on opening the case to avoid any warranty problems, or does it open up very easy?

- By the way, are those 4016 parts with the red crosses out Bilateral Switches? Are the crossed out parts E-MOSFETs? Does this mean to replace the E-MOSFETs with Bilateral Switches? Is this a correction, or a modification?

- Can anyone translate the labeling to English or describe what each stage does? I'm just beginning to learn these circuits.

Many thanks,

-SB

[Steve in MS]

Just take the screws out, if you have knowledge about dealing with electronics, it is no problem to do.

What I wish for is a way to add a static mode to the Compadre for pinpointing and sizing a target, it would then be a killer in trash for relic hunting. It does well for parks and such however.

[Max]

Thanks Max and Steve for the answers.

- Any advice on opening the case to avoid any warranty problems, or does it open up very easy?

- By the way, are those 4016 parts with the red crosses out Bilateral Switches? Are the crossed out parts E-MOSFETs? Does this mean to replace the E-MOSFETs with Bilateral Switches? Is this a correction, or a modification?

- Can anyone translate the labeling to English or describe what each stage does? I'm just beginning to learn these circuits.

Many thanks,

-SB

Hi,
I don't know about warranty (lifetime !) lost if screws are removed... ops... so consider well the pros and cons before screwing it...

4016 are integrated transmission gates (bilateral switches) much like fets operate; you can replace with 4066 if you need.

When disabled you have hi-impedance between port's leads... when enabled you got something from 50-200 ohm depending on device/brand/family.

I'm not sure... but think original Compadre has real fets there and you have to replace with transmission gates.

The TLC2262 is a modification too I think: they are present in bandidoII and the scope is wasting less power on op. amps. though getting very good noise level (lower than with LF ic).

Look at the Tesoro's section you'll find a thread about bandidoII where I explained (months ago) the various blocks etc

Kind regards,
Max

[simonbaker]

Just take the screws out, if you have knowledge about dealing with electronics, it is no problem to do.

What I wish for is a way to add a static mode to the Compadre for pinpointing and sizing a target, it would then be a killer in trash for relic hunting. It does well for parks and such however.

I don't know the circuit well enough yet, but I wonder if the motion mode depends basically on some kind of time constant somewhere (capacitor, etc.). Rather than make it totally static, maybe could switch to a really long time constant (like adding a capacitor in parallel with a switch) that would approximate a static mode for 10 to 20 seconds or so. Seems like that might be easier and avoid instabilities and drift problems. Just a wild idea.