GS 5 THRESHOLD PROBLEM

[dbanner]

the lm 2991 looks a good choice and could solve the threshold problem...i think the SM version would be a better choice than the TO220 type.

You could find a bunch of smd regulators in old add on boards from old PC stuff.
But they're rated only around 100ma. You need something rated @1A, hence TO220.

[daverave]

I don't think I will be hunting at temperatures above 30 degrees Celsius, better to be indoors.
So from advise, it looks like easy mod. Loose the 79L12, connect instead to -10V, then change 337 to 2991.

the lm 2991 looks a good choice and could solve the threshold problem...i think the SM version would be a better choice than the TO220 type.

[eclipse]

Dave the problem is not the converter efficiency but the fact that where they are not synchronized they pour in too much noise.
I don't recommend using them at all if you can sync them with the TX cycle.

[kt315]

android phone 'charger in your opinion' microUSB plug gives +5V sure. so this is NOT charger but a stabilizer of just +5V. a charger micro sets in THE PHONE ON ITS BOARD ITSELF. if you put it in your detector you can charge li-ion from this power supply. use balansir board, its simplest way.

[daverave]

ive used those converters from china and yes they are very good but somewhat power hungry.

[dbanner]

What about charging?

[kt315]

Very good price. Very small. Very cool. Very Chinese. Do they carry the positive version?

if you connect it between batt and board (between source and consumer) you do not have to think about the polarity. plus on plus.
minus on minus.

[kt315]

[dbanner]

https://www.ebay.com/itm/Mini-DC-DC-...BMJQ:rk:2:pf:0

use

typical efficiency 82%. PERFECT!

Very good price. Very small. Very cool. Very Chinese. Do they carry the positive version?

[kt315]

your 5pcs un-chinese li-ion bats are ready to start. LOL!!!

[kt315]

you simply do now want to hear me. you try to fix a problem HEAD ON. or, we want to fly on Mars. then we must to icrease of power of our
rocket. LOL! so WHY aliens EASELY fly around you from space and into space on their fliyng saucers? no answer.
just impulse gives HIGH ADVANTAGE. LOW POWER CONSUMPTION. LOW ENERGY CONSUMPTION. if you have an engine with UNLIMITED energy
you can fly in space and from space EASELY! Elon Mask is CRYING looking on UFOs in the sky!

LEARN THAT MATTER. learn electronics - filos did call me PROFESSOR. THE PROFESSOR. and yes, i am the pro.

[dbanner]

The TDI SL has audio based on 4066 and 555 and 3 additional op amps. It doesn't use 79L12.

Interesting, 555 instead of AD654, 4066 instead of Jfet's. Not much in it.

[dbanner]

I don't think I will be hunting at temperatures above 30 degrees Celsius, better to be indoors.
So from advise, it looks like easy mod. Loose the 79L12, connect instead to -10V, then change 337 to 2991.

[daverave]

You have to raise the voltage to 14-15V for it to be stable.
---
Eric, in my elite i LEFT LM2931-ADJ on board. now i think to delete it. a converter gives 13V on output. from 3.7V to 13V. enought reserve on voltage.
you can believe me or not.

Hi kt315....im not keen on chinese li-ion batteries as many are not what they rated to be....as an example some years ago i bought some li-ion rated at 6000 mAH and when i tested them they were only about 800 mAH....so i no longer buy li-ion batteries from china...a lot of my batteries ive got from laptop battery packs....i really want the GS 5 to run from 15v down to 11v....even at 11 volts the detector gives good depth but with the drifted threshold.

[kt315]

photoshoped. i use chinese low price drop charger for 18650, just added wire+connector.