Technical data

The power supply section’s output terminal block

also allows for the stepped down AC voltage to be

used direct from the center tapped transformer.

The transformer provides a voltage of 30VAC

from line to line or 15VAC from either line to the

center tapped ground (See Figure P-8).

WARNING:

Do not short the 15 VAC output to ground!

Variable resistance section

The Elenco trainer has two built in variable resistors or “potentiometers” that are available to use for

certain lab experiments. The values of the variable resistors are 1k ohm and 100k ohm max. Taking a

resistance measurement from one side of the terminal block to the other will give the full value of the

resistor (1k ohm or 100k ohm) regardless of the position of the knob. If you take a measurement from

either end of the terminal block to the middle wiper connection, you will get a variable value that will

change with respect to the position of the knob. (See Figure P-10)

1k

otentiomete

0 to 1k oh

Full 1k ohm

Ohmmeter

30VAC

15VAC

Step Down

Transformer

120VAC

AC Voltmeter

ure P-8

Figure P-9

100k ohm potentiometer 1k ohm potentiometer

1k terminal block 100k terminal block

Figure P-10