ML1 • 6
ML1 CIRCUIT DESCRIPTION
The ML1 is similar to a common mounted light dimmer, except that the lamp
control comes from the voltage derived from the music rather than a
potentiometer. The control voltages come from three separate, simple audio
filters which break the audio spectrum into individual frequency bands.
Audio signals from the speaker input are current limited by R1 and applied to
transformer T1. The transformer’s function is to provide isolation from the AC
line and to step up the speaker voltage to insure reliable triggering of the SCRs
even at low volumes. This stepped up signal level feeds the three sensitivity
controls. After each control, a simple audio filter is used to tailor the response of
each channel. Capacitor C1 and inductor R5 form a high pass filter, C2 and R6
form a bandpass, and C3 and R7 form a low pass filter. The frequency range of
each filter is selected to provide a pleasing crossover effect for the proper
control of the lighting. Each filter output drives its corresponding SCR which
controls the AC load you have connected. An SCR (Silicon Controlled Rectifier)
functions similar to a relay, where we can control a large load from a small
signal current.
Extreme caution must be used when wiring your ML1 since the AC line is
directly connected to your circuit board. Use the same care and safety
techniques you’d use if you were wiring up a light or a wall outlet. Remember,
that‘s a pretty good jolt those wires can deliver!
KIT ASSEMBLY
Each of the following steps is complete in itself. This means that you
1. Identify the component called for;
2. Insert it into the proper location on the PC board;
3. Solder its leads to the PC board;
4. Carefully trim away the excess lead wire.
As you complete each step, check it off and proceed to the next step
1. Install switch S1 into its six holes on the PC board and solder all six
pins. Ignore the other set of six solder terminals on the top of the switch.
2. Install T1, the audio coupling transformer. Notice that one side has
some red paint or marking indicating the primary side. Install it so this
side faces away from the speaker jack as shown on the parts layout
diagram.
3. Install R2, R3, and R4, the PC mounted pots. Solder all five pins, being
especially sure that the larger mounting tabs are securely soldered.
4. Install J1 the RCA jack.
(27 paginas)
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