Page 5 of 9
skc_assy_041722.pdf
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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 .25” above the board.
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Install Q1, 2N7000 mosfet, observe the outline shown on the board.
Mount Q1,2 very close to
the board, so that the top is no more than .25” 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 main 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.
In option 2, the two boards must be interconnected with each other by four jumpers, replacing the four
traces you removed with the cut and trim operation.
It is usually easiest to decide where you want to mount the two boards, solder longer than needed
interconnecting wires to the main board, and secure it in place with some double sided foam tape. This
includes the four wires to the connector board and any connections to your radio you need from the
main board. Then cut, trim, and solder to the appropriate point.
Be sure you have trimmed all the leads
off the bottom of the main board before attaching the foam tape. If mounting on a conductive surface,
leads can stick thru the double side and short against the chassis.
