Electronic projects

you are here: home page :: projects :: Audio :: VU meters & spectrum analyzers :: 3 Channel Spectrum Analyzer

3 Channel Spectrum Analyzer

This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range. The circuit will take line level output from most any audio source, and operates on 12V DC. This means that it can even be run in a car.

Circuit dijagram

R1 100K 1/4W Resistor
R2 820K 1/4W Resistor
R3, R14, R16, R18 2.2 Meg 1/4W Resistor
R4, R5, R6 22K Pot
R7, R8, R9, R25, R27, R29 10K 1/4W Resistor
R10, R11, R12 680 Ohm 1/4W Resistor
R13. R15, R17 580K 1/4W Resistor
R19, R20, R21 39K 1/4W Resistor
R22, R23, R24 47K 1/4W Resistor
R26, R28, R30 33 Ohm 1/4W Resistor
C1, C5, C6 0.012uF Polystyrene Capacitor
C2, C9, C10, C11 3.3uF Electrolytic Capacitor
C3, C4 0.0022uF Polystyrene Capacitor
C7, C8 47nF Polystyrene Capacitor
C12, C13, C14 0.47uF Electrolytic Capacitor
C15, C16, C17 22uF Electrolytic Capacitor
D1, D2, D3 1N4002 Silicon Diode
D4, D5, D6, D8, D8 Green LED
D10, D11, D12, D13, D14 Amber LED
D16, D17, D18, D19, D20 Red LED
U1 LM3900 Quad Op Amp
U2, U3, U4 AN6884 Bar Graph IC
MISC Board, Wires, Sockets For ICs

1. The circuit expects line level inputs. If you connect it to speaker level, you will have to readjust the circuit every time you change the volume.
2. After the circuit is connected, apply power and signal. Now adjust the pots until the corresponding group of LEDs reacts.

web site: http://www.aaroncake.net
project categories:
folder Audio (49)
folder Power & high voltage (43)
folder Radio (23)
folder Light & LED (31)
folder Tools & measurement (40)
folder Telephone (18)
folder Automotive (10)
folder Microcontrollers (12)
folder Sensors & control (47)
folder Timers & oscillators (40)
folder Miscellaneous (26)

StumbleUpon button

Share this page
Bookmark and Share
project subcategories:
All subcategories
preamps, filters, effects
VU meters & spectrum analyzers

similar projects:
Sound Level Indicator
Sound Level Meter
Three-Level Audio Power Indicator

recently added projects:
Doorbell for the Deaf
High Quality Intercom
Combinational Conjuring Trick
Ultrasonic Dog Whistle
Quiz Circuit
LED Torch
Insect Repellant
Speaker Microphone Circuit
Magic Wand Conjuring Trick.

most popular projects:
Led display digital Voltmeter
500W low cost 12V to 220V inverter
Low pass filter - Subwoofer
High And Low Voltage Cut Off With Time Delay
Metal Detector
2N3055 Power Amplifier
Basic UPS Power Supply
200W audio amplifier
LED Torch
100W RMS Amplifier

DIY Electronics Projects

Promote Your Page Too