"Build to Learn" Measurements
Here are some measurements that I made on the Pixie 2.
I am measureing resistance at the base, emitter and collector of both transistors,
and at each pin of the IC.
These will be measured without power and twice for each point, one with key up and one with key down.
I am also measureing voltage at the same points and twice, one with key up and one with key down.
|
|
Resistance
|
Voltage
|
PINS
|
RX
|
TX
|
RX
|
TX
|
|
Q1 - e
|
2
|
2
|
6.35
|
6.42
|
|
Q1 - b
|
90
|
80
|
5.99
|
6.81
|
|
Q1 - c
|
43
|
33
|
9.01
|
8.62
|
|
Q2 - e
|
10
|
0
|
8.86
|
0
|
|
Q2 - b
|
10
|
0
|
8.83
|
0
|
|
Q2 - c
|
43
|
33
|
9.01
|
8.48
|
|
U1 - 1
|
91.3k
|
90.6k
|
1.19
|
0.09
|
|
U1 - 2
|
75.4k
|
76.1k
|
0
|
0
|
|
U1 - 3
|
0
|
0
|
0
|
0
|
|
U1 - 4
|
0
|
0
|
0
|
0
|
|
U1 - 5
|
94.0k
|
88.0k
|
2.05
|
0.14
|
|
U1 - 6
|
41.7k
|
31.0k
|
4.26
|
0.70
|
|
U1 - 7
|
87.8k
|
93.0k
|
2.16
|
0.06
|
|
U1 - 8
|
90.9k
|
89.7k
|
1.22
|
0.13
|
|