Why?

[Mark-VA]

After increasing the voltage on my TDI battery pack from 12 to 16v, I only see an extra 2" in depth using the 12 dual field coil (only). My 7 1/2" dual field and the Super Pulse 350 show absolute 0 depth increases. The super pulse 350 is a huge coil.
Why?

[ivconic]

I poured 5 gallons of fuel more into my Opel.
But it wont run faster??
Why?

[kt315]

just some diy projects give 500-600us PULSE WIDTH. whites specs say nothing on PULSE WIDTH. probably in
100-150us range. you can not increase PULSE WIDTH by a simple way.

WARNING. never try to get a depth by the increasing of voltage of power supply. you either burn out your detector
or get nothing.

[Carl-NC]

Mathematically, a 33% increase in TX drive produces a 5% depth increase. This is for the far-field (6th power law). Near-field is slightly better but not much. A 5% difference is difficult to measure objectively, a 10" deep target becomes 10.5".

Also depends on what target you are using. A nickel might show better depth with the 12" coil but not with the 350. A coke can might be a better target for the 350, and a sub-gram nugget for the 7" coil.

[kt315]

try to read article of Carl HAMMERHEAD. PULSE INDUCTION METAL DETECTOR, especcialy page 4.
also, in recommended, INSIDE THE METAL DETECTOR, section 11, PULSE INDUCTION PRINCIPLES, page 143.

good comfort reading

[Mark-VA]

Thanks for the replies