Tesoro Cibola SE power consumption

[ivconic]

For years, I have heard from various owners of this detector that this detector simply "eats" batteries.
And I finally got my first Cibola yesterday! It is an "SE" version for the German market.
(I highly doubt it makes any difference to any other Cibola)
Unfortunately for me, the detector did not come with a "small" stock coil (because I love small coils),
but came with a SEF coil which is larger and makes this detector much "deeper" and more desirable for most users.
The "depths" in the air here in the room are PHENOMENAL! It does not look like the Tesoro "shallow" detectors, which we are used to until now.
But that's not the topic now. The topic is "eating" batteries.
And instead of writing novels here, the video will say it all instead of dozens of unnecessary posts.

[ivconic]

The final conclusion is: Cibola does not "eat" batteries.
Cibola is behaving normally.
The problem lies in another fact!
The designers of Cibola (the Gifford brothers I assume) made a "tactical error" with the solution that the detector uses a single 9V battery.
The vast majority of those 9V batteries that can be found on the market today are of low capacity.
And that is the source of all problems.
Simple addition of a box on the part of the bar under the elbow with 6x1.5v batteries; solves this problem forever!

[ivconic]

In order to get the maximum performance out of Cibola; it is preferable to increase the Threshold potentiometer to the maximum in Disc mode.
And then Cibola becomes a "beast".
In All Metal mode, the Threshold potentiometer is set to a lower level to barely hear or no sound without detection.
And that's the "secret" about power consuming.
Lazy, careless and a little senile; I totally forgot to check the speaker impedance.
If it's 16 ohms then that's standard.
If it is 8 ohms; then the problem can be alleviated by replacing the speakers with 16 ohms.
Even at 32 ohms.
Even at 64 ohms!
Because it is the main power consumer in the whole story.

[ivconic]

Same story compared... my DIY Bandido with LDO and LV chips:

[Gwil]

One of the reasons why I prefer headphones.

Of course headphones do stop you hearing people sneaking up on you...

[ivconic]

My focus wanes, of course; forgot to test with headphones!
But now I'm thinking about another aspect of the whole story.
The second video shows Bandido, from the "older" series of Tesoro detectors.
TX coil is about 17-22 ohms.
And the TX output stage consumes much less current.
Cibola is from the "newer" series, the TX is 4.8 ohms and the TX certainly consumes more current.
The result of this change is much greater "depth" in Cibola compared to Bandido (almost double!).

P.S.
Cibola doesn't have a volume control, it's debatable how hard it will be on the ears!
But there are headphones with their own volume control, so that can be solved.
A typical headphone impedance is around 32 ohms.
It will definitely reduce battery consumption.
And additional volume adjustment in the headphones will save a few more mA.