AC/DC Power Supply Controller for Ripple Tank, Variable DC and Fixed AC Pack Size_7 and permittivity

and permittivity

with adjustable slit and draw-out focusing for examining the spectral composition of light sources

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

and acetate strips for hollow-conductor work

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

AC/DC Power Supply Controller for Ripple Tank, Variable DC and Fixed AC Pack Size_7 and permittivityTwo variable 0 to 6V DC outputs paired with two fixed 6V 10W and 12V 20W AC outputs on this power supply controller, sized for ripple tank and bulb driven physics demonstrations.