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AC Light Organ Circuit

# AC Light Organ Circuit - AC LIGHT ORGAN CIRCUIT MICHAELA...

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AC LIGHT ORGAN CIRCUIT MICHAELA CUI PERIOD 2/3 27 MARCH 2007

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SUMMARY: In this experiment, a light organ fed off of an AC power supply was built and tested for efficiency. Different sources such as music, and varying frequencies were fed through the circuit and voltage, impedance, and resistance were measured. Lights containing 5 watt bulbs were used, and the power source was measured to be 115.5v. Initially, the resistance through Resisters 1, 2, 3, and 4 were found to be 0.98kΩ, 1.34kΩ, 1.34kΩ, and 4.63kΩ, respectively. The theoretical values for these transistors were 1kΩ, 2kΩ, 2kΩ, and 4.7kΩ. These measurements are slightly low – especially through resistors 2 and 3 - however, due to the alternating current of the circuit, the theoretical values for resistance are merely an average. See Figure 2 for a schematic of the circuit. Using the average values given for the resistance of the resistors, the total resistances through the RC networks were found to be 760.9428Ω, 1228.2609Ω, 1403.6526Ω, and 1106.2971Ω, respectively. These numbers make sense, as the lowest resistance is the low-pass filter, and the highest resistance results from the high-pass filter. The voltage drops through each of the SCR’s (silicon controlled rectifiers) were measured and found to be 115.7V through SCR1, 115.8V through SCR2, and 115.5V through SCR3. The total available voltage from the power source was 115.5V, and with error of the measuring device, these measurements prove the light organ to be an efficient circuit.
The current through each of the outlets were measured to be 20mA, 20mA, and 35mA, respectively, to yield a total current of 75mA through the circuit. Because of the AC characteristic of the circuit, Ohm’s Law is not an accurate representation of the behavior of the circuit, but can be used for instantaneous currents, resistances, and voltages. ABSTRACT: The circuit being tested is a light organ which uses silicon controlled rectifiers to control the activity of three outlets, and an audio input to supply the activating frequency. Voltage is supplied to the outlets and SCR’s through a 120VAC source. The audio input is first run through a “step-up” or inverter transformer. This step-up transformer consists of two tightly bound coils around a metal rod. The first coil, or primary coil, has fewer loops than the secondary coil.

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AC Light Organ Circuit - AC LIGHT ORGAN CIRCUIT MICHAELA...

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