Page 3 of 9
skc_assy_041722.pdf
Option 1
Install the smallest components first. All the components mount on the front of the board. Use the
placement guide below.
Parts placement figure
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Install D1, the small glass 1N4148 diode, Match the black end with the silkscreen outline.
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Install R1, 100 ohm resistor, (brown-black-brown-gold). See note in General Design Notes,
concerning function button volume.
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Install C1,2,3,4, 100nF (.1uF) capacitor, marked 104
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Install 8 pin dip socket
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Install C5, 10uF electrolytic capacitor.
Observe polarity marked on the board. Long lead is “+”.
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Install U2, 78L05, observe the outline shown on the board.
Mount U2 very close to the board, so
that the top is no more than 1/4” above the board.
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Install Q1, 2N7000 mosfet, observe the outline shown on the board.
Mount Q1 very close to
the board, so that the top is no more than 1/4” above the board.
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Install S1, 90º tactile pcb switch where indicated.
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Install J1, 3.5mm audio jack where indicated.
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Clip all the leads flush on the back of the board.
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Install the ATtiny45 IC. Be sure of pin 1 orientation, the pad is rectangular.
When inserting IC’s, the pins are flared so that they can be retained by auto insertion tools. Gently rock
them on a flat surface so the pins are parallel and they will insert into the socket more easily. Be sure
of pin 1 orientation.
