Figure 6:
Most everything else
Table 4:
Parts should be installed in the order in which they are listed in the table below.
LED Display
This will go in only one way as there are two missing pins and corresponding
pads.
U4,28 pin DIP socket
When installing sockets, double check the leads to make sure none of them are
folded over under the socket. This is very hard to fix once you start soldering!
U7, 14 pin dip socket
U1, U2, U3, U5, 8 pin
Phone and paddle jacks Make sure they are set flush to the board.
R39, R40 and R41
51 ohm, 2 watt resistors Green/Brown/Black/gold
Q1
2N3906
Q2, Q3, Q5, Q6
2N7000
Q7, Q8, Q9
BS170
Q4 FQP8P10
FQP8P10, TO-220 Mosfet
U6
78L05 Check the number very carefully so as not to mix up with U8
U8
78L06
The electrolytic caps are installed laying flat to the board. The value indicated
on the diagram is in pfd. 105 = 1,000,000 pfd = 1 ufd
C4, C5, C6 (105)
1 ufd Aluminum Electrolytic. Long lead is plus, black stripe on can is negative.
C3, C33, C39 (107)
100 ufd Aluminum Electrolytic
C47 (227)
220 ufd Aluminum Electrolytic
When installing the switches, make sure the switch is set square to the board
before soldering more then one pin! If the switch is tilted, it may not fit into
the slot in the enclosure.
S4, S5, S6
DPDT slide switch
S2, S3, S7
DP3T slide switch
S1
Long handled Tactile push button switch
ENC1
Mechanical rotary encoder.
V1
10K variable resistor.
D6
LED Space off board 1/4” to bottom of the LED.
