• on Miscellaneous Electronics
  • Published in issue 10/2014 on page 28
About the article

Dot Display Driver

Dot Display Driver
There are situations when it is useful to scale the dynamic range of a signal down to a few coarse sub ranges. As an example you can think of an indicator that does not show the exact speed of a motor, but only a few values like Off, Slow, Medium, Fast and Too Fast. Such signals can easily be obtained by averaging (i.e. low-pass filtering) amplitudes, frequencies or pulsewidths of signals produced somewhere in the system that you want to keep an eye on.
Downloading of this magazine article is reserved for Elektor Members only.
Already a member? click here to log in.
Products
Relevant websites
Component List
Resistors
(0.25 W)
R9,R10,R11,R12,R13 = 390Ohm
R1,R2,R3,R4,R5,R6,R7,R8 = 4.7kOhm
R15 = 47kOhm
R14 = 1MOhm
P1 = 100kOhm, trimmer
Capacitors
C2 = 100nF
C1 = 1µF
Semiconductors
D1,D2 = 1N4148
IC1 = LM324
LED1,LED2,LED3,LED4,LED5 = LED, red, 3mm
T1–T4 = BC557C
Miscellaneous
K1 = 3-pin pinheader, 0.1” pitch
PCB # 140111-1
Loading comments...