RC Timing for RC 1. How Long the Circuit Stays Active.
Remember that this is only a rough guide. It is not a precise timer.
R
C
Time
20 M ohms
10 uF
120 seconds
10 M ohms
10 uF
60 seconds
4.7 M ohms
10 uF
30 seconds
20 M ohms
1 uF
12 seconds
10 M ohms
1 uF
6 seconds
4.7 M ohms
1 uF
3 seconds
The following table provides timing for RC2.
Oscillation Rate Table Settings
for RC
R
C
Rate
2.2 M ohms
.1 uF
1 Hz
1 M ohms
.1 uF
2 Hz
470 K ohms
.1 uF
4 Hz
220 K ohms
.1 uF
10 Hz
100 K ohms
.1 uF
20 Hz
*
47 K ohms
.1 uF
40 Hz
22 K ohms
Higher Frequencies Need a
.1 uF
smaller capacitor value to
100 Hz
work properly.
1 M ohms
.
01 uF
20 Hz
*
470 K ohms
.
01 uF
40 Hz
220 K ohms
.01 uF
100 Hz
100 K ohms
.01 uF
200 Hz
47 K ohms
.01 uF
400 Hz
22 K ohms
.01 uF
1000 Hz
10 K ohms
.01 uF
2000 Hz
4
.
7 K ohms
.01 uF
4000 Hz
2
.
2 K ohms
.01 uF
10,000 Hz
*the eye cannot distinguish flashing from continuous motion anything faster than 24 frames per second.
Remember that this is only a rough guide. It is not a precise timer
You won't be able to use it as a reliable pitch pipe
.