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a b c d e f g h i j
576 Modulator
I discovered the 567 tone decode chip from an old hemmo project. The chip
itself was used back in the day to decode touch tone frequencies on phones.
When misused as a stompbox effects generator, the 567 can yield some
interesting sounds. This project is a simple adaptation of the 576 to produce
a variable modulation effect that goes from ring modulator to tremolo.
beavis board project
A100K
Volume
in
out
Mods!There are many different configurations of inputs and outputs for this chip.
Although the datasheet specifies one input and one output, I’ve used pins 1,2 and
3 for inputs and outputs with different sonic results.
You can change the values if the input and output caps (C1 and C2) to lower
values to remove bass.
The VR1 and C3 parts set the operating frequency of the circuit, experiment with
different values here.
10uf
+
567
1
7
2
C2
10uF
C4
100nF
34
VR2B50K(filter)
C5
100nF
6
5
VR1B100K(mod) C3
10uF
U1
LM567
C1
10uF
9 volts +
Input
VR3A100K
(volume)
Output
100n
F
10uf
+
B100K
Mod
10uf
+
100n
F
B50K
Filter
revision: 1.0 ● 28 may 2008 ● © 2008 beavis audio research
