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030
12-V Light Organ
B. Kainka
Many people would like to build a light organ but are
scared off by the dangerous mains voltage. A direct elec-
trical connection to the amplifier should also be avoided.
The light organ circuit presented here has been developed
for 12-V halogen lamps and is controlled by sound waves. All
you need is a triac, a condenser microphone and a few
other components.
The electret condenser microphone needs a supply volt-
age, since it has a build-in amplifier. A supplementary tran-
sistor stage amplifies the microphone signal and feeds it to
the gate of the triac. Nearly any type of triac in a TO220
package can be used here (such as a TIC206, TIC216 or
TIC226). The circuit is powered from the halogen lamp
transformer. A mini power supply, consisting of a rectifier
diode and a filter capacitor, generates an unregulated but
still satisfactory dc voltage for the amplifier.
D1
1N4004
R1
R3
R4
La1
T2
12V
20W
R2
C2
12V
2A
T1
1000 µ
25V
C1
BC
TRI1
A2
547B
330n
BC
G
A1
MIC1
549C
TIC206
014068 - 11
(014068-1)
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