Elektor TAPIR Podręcznik budowy - Strona 5

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Assembly

Start by soldering the switch onto PCB 2 and the panel-

mount connector for the headset onto PCB 4 (apply solder

sparingly). Then remove these two PCBs from the PCB

panel and file the tabs off.

Next, fit the following components on PCB 3 using the previously

described soldering method:

1. C3 (10 F; no marking, large SMD)

2. R1 & R4 (100 k ; marking 1003)

3. R2 & R3 (100 k ; marking 1002)

4. R5 (1 k ; marking 1001)

5. C1 (10 nF; no marking, small SMD)

6. T1 (BSR17; marking U92)

7. T2 & T3 (BC847, marking 1FW)

Now check the circuit for proper operation before

continuing with assembly. This is important because any

mistakes at this stage will be very difficult or impossible

to correct later on.

Temporarily connect a 1.5 V supply voltage to the points indicated below.