Dream Catcher ME3100, Быстрый старт

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ME3100 Analog Circuit Design
Quick Start Guide - 7/25
1.3 Equalizer with LED Audio VU Meter Test and Verification
1. Remain the same connections of the ME3100 Analog Circuit Design kit as shown in Figure 1.
2. Build a 3-band gyrator-based equalizer with UV meter by following the schematic connections as
shown in Figure 5 on the breadboard of the ME3100 Analog Circuit Design kit. Refer to the
appendix for the pin layout of op-amp
LM158 .
Figure 5
– Schematic Diagram of the 3-Band Gyrator-Based Equalizer with VU Meter
3. Table 2 shows the value of the electronics components of the schematic.
Table 2
– Value of Components
Label Value
R
1
1.5 kΩ
R
F
120 kΩ
R
L
330 Ω
C
F1
560 nF
C
F2
2.2 µF
C
F3
150 nF
C
L1
1.2 nF
C
L2
4.5 nF
C
L3
270 pF
4. Figure 5 shows a 3-band equalizer based on a single variable gain amplifier using, the gyrator-
based bandpass filter. The resonant frequencies of the filter are 250Hz , 1 kHz , and 4 kHz .
5. The op-amp U3A is acting as a buffer circuit (unity gain amplifier) in order to isolate the signal
sources from the equalizer filter banks.
6. With all the connections properly connected as shown in Figure 5, configure the power supply as
described in Section 4.1 and turn it on. The red LED D1 on the ME3100 Analog Circuit Design kit
will blink for a moment.