Velleman projects K2655 Assembly instructions - Manual (Page 11)

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Turn all the trimmers to their centre position.
Connect a loudspeaker of at least 4 ohm to the points LS.
Connect the transformer (8V-0-8V) to the points VAC (Fig. 1.0). The center tap (0) should be connected
to ground (GND, the middle one of the three VAC pins). The circuit can also be powered with direct cur-
rent (9 to 12V, unregulated): in this case the negative goes to GND (the middle pin), the positive to one of
the two outmost pins A or B (Fig. 2.0)
Make some noise, your loyal servant will promptly start barking.
With RV1 (TRIG LEVEL) you can adjust the sensitivity of the detector. In case the circuit is too sensitive
you may replace R20 by a 1M (brown, black, green, gold) or 470K (yellow, violet, yellow, gold).
RV4 is the volume potentiometer.
With RV3 you can adjust the pitch of the barking. Remove J1 and install J2 to select the other dog.
After each triggering, the circuit continues barking for a while. With RV2 you can adjust that period.
The circuit can also be triggered by other detectors if you like: to make the dog bark, you only have to short-
circuit the TRIG points with a relay contact, push-button, etc...
Test & use
17. TEST & USE
H2655IP'1_rev3.pub
page 11 Friday, December 07, 2012 16:58