The cache is not located at the posted coords. Solve the puzzle below to find the actual coords.
N38 27.ABC W121 29.DEF
Note that D=6.
A transformer is a passive component that tranfers electrical energy from one electrical circuit to another circuit, or multiple circuits.
It is designed to either increase or decrease AC voltage between the circuits while maintaining the frequency of the current.
What type of transformer is this:

If Toroid, A=7. If Audio Output, A=8. If Single-Phase, A=9
What type of transformer is this?

If Toroid: B=3. If Audio Output, B=5. If Shell-type, B=8
In the drawing below, what is the turns ratio on this transformer?

If 25:55, C=7. If 1:3, C=5. If 1:2, C=1
Solid cores
Powdered iron cores are used in circuits such as switch-mode power supplies that operate above mains frequencies and up to a few tens of kilohertz. These materials combine high magnetic permeability with high bulk electrical resistivity. For frequencies extending beyond the VHF band, cores made from non-conductive magnetic ceramic materials called D are common.
Cooling
It is a rule of thumb that the life expectancy of electrical insulation is halved for about every 7 °C to 1E °C increase in operating temperature (an instance of the application of the Arrhenius equation).
Closed-core transformers and parallel power distribution
In the autumn of 188F, Károly Zipernowsky, Ottó Bláthy and Miksa Déri (ZBD), three Hungarian engineers associated with the Ganz Works, had determined that open-core devices were impracticable, as they were incapable of reliably regulating voltage. In their joint 1885 patent applications for novel transformers (later called ZBD transformers), they described two designs with closed magnetic circuits where copper windings were either wound around an iron wire ring core or surrounded by an iron wire core.