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Piccolo MC Headamp Kit Manual
6
If you want the Piccolo to be permanently on (not recommended for battery operation),
then you can add a jumper as shown to S2. This converts the originally “off” position to
a 0dB gain setting.
Install rotary switches with the alignment stub toward the bottom. Cut stub off.
Remove the nuts from the rotary switches and line up circuit board onto top panel. Insert
the dc jack such that it fits onto circuit board and into panel hole. Add nut. This sets the
proper mounting height of jack. Solder in place. Remove panel. Put nuts back onto
switches to make sure the lock rings do not fall off.
Add battery holder on backside with two #6 screws and washer standoffs. The
screws form threads in the plastic. Do not over tighten. Solder leads.
Add the #6 x 1” screw in the central ground hole (near loading switch) facing
upwards. Secure in place with a nut. Add another nut loosely about ½” up.
Testing
The circuit board is now complete and ready to mount in the chassis. But first, plug it in
and turn it on. The LED should light. If you have test equipment, apply a small input
signal (below 0.1V) and measure the output.
Final Assembly
Mount the LED dome to top panel. Secure with plastic ring. Remove nuts from rotary
switches and mount circuit board onto top plate. Secure in place with switch and dc jack
nuts. Underneath, rotate the #6 nut so that it touches the plate. Add #6 knurled knob on
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