Elecraft T1 Assembly Manual - Manual (Page 21)

21
Install the following 1/8 watt resistors.
__ R9, 180 ohm (brn-gry-brn) __ R21, 3.3k (org-org-red) __ R11, 24k (red-yel-org)
Position resistor R13, 3.3K (org-org-red), 1/8 watt on the board and spread its leads to hold it in place.
Do not solder yet. You will be instructed to solder the leads in a following step.
Insert one of the pushbutton switches in the position for S2. It can be oriented either way. Make
certain the ridges on the bottom of the switch housing are against the board.
Solder one terminal of S2, then inspect the switch to make sure it is still sitting directly against the
board. If necessary, reheat the soldered terminal while pressing the switch down against the board.
When you are satisfied that the switch is against the board, solder and flush-cut the remaining
terminals of S2 and the leads to resistor R13. Take care not to touch J5 with your soldering iron.
Insert the second push-button switch in the position for S1. It can be oriented either way. Solder one
pin, then inspect the switch to make sure it is still sitting directly against the board. If necessary, reheat the
soldered terminal while pressing the switch down against the board.
When you have confirmed that the switch is in position, solder and flush-cut the remaining three
terminals.
Cut a 2-1/2” (64 mm) length of the black #28 AWG stranded wire. Strip the insulation from 1/8”
(3 mm) at each end and tin the bare wires. Insert one end in the “–” solder pad near R11 on the top of the
board, then solder and flush-cut on the bottom of the board. Dress the lead over the edge of the board next
to R11.
Slip the round spacer over the leads of the red LED.
Insert the longer lead of the red LED into the round solder pad for D8.
i
The longer lead must go into the round solder pad or the LED will not work.
Spread the leads to hold the LED in place with the spacer against the board. Solder and flush-cut the
leads.
Inspect the position of the LED to be sure it is sitting vertically against the spacer. If necessary, reheat
the solder pads one at a time while adjusting the LED position.
Following the same procedure, install the remaining two LEDs on spacers. Be sure the long leads go
into the round solder pads.
__Yellow LED at D7 __ Green LED at D6