Velleman projects K7000 Assembly instructions - Manual (Page 8)

8
Test & Usage
Connect a test flex (preferably screened) to the in- and output (marked OUT, IN).
Turn the potentiometers to their minimum position (completely to the left).
Connect a loudspeaker (min 4 ohm 0,5W) to output LS and earth.
Connect either a transformer ( 2 X 7- 9VAC) to points VA and VB (fig 1.0), with its centre branching to earth,
or a 9V battery with its plus pole to VA or VB and its minus pole to earth (fig 2.0).
Disconnecting the power supply can be achieved using a switch (in the plus connection when using a
battery, in the mains connection when using a transformer).
To test the circuit, connect the output test flex to the input test flex.
When you now turn both potentiometers, an audible test signal should come out of the loudspeaker, at least
when everything is working all right.
12. TEST & USAGE
RV 1
RV 2
Fig. 1.0