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DIY Hobby projects, diagram, schematic

LED STEREO SOUND LEVEL INDICATOR

electronicecircuits, November 21, 2009September 14, 2023
LED STEREO SOUND LEVEL INDICATOR for audio amplifier

LED STEREO SOUND LEVEL INDICATOR FOR AUDIO AMPLIFIER

Many circuits can be designed as level indicators by using a comparator IC or transistors but these are costly and complex and also time consuming. This stereo sound level indicator circuit removes all the complexity by using a single TA7666p IC. LEDs are used as a power indicator. Different colour LEDs can be used for both the channels. One can also use an LED bar graph display. INPUT signals should be given from preamplifiers. Otherwise, LEDs will not glow at low volumes.

LED STEREO sound LEVEL INDICATOR circuit for audio amplifier circuit diagram

PARTS LIST
R1-R101kΩ
R1115kΩ
R1215kΩ
C10.1µF
C20.1µF
C31µF 16V
C41µF 16V
D1-D1010 LEDs
IC1TA7666P

If you have mono systems, signals should be given into both the channels. The input is given through two 4.7 µF capacitors and two 18k resistors to pins 1 and 16 respectively.

TA7666P stereo sound level indicator ic

Both of the TA7666P and the TA7667P consist of two inverting amplifiers, ten comparators and a reference voltage network.

Turn-on level intervals are 5dB, 5db, 3dB, 3dB in TA7666P, and are 2dB, 2dB, 2dB, 2dB in TA7667P. It is suitable for stereo radio cassette applications because of dual type.

  • Suitable for stereo LED driver
  • Wide Supply Voltage Range : VCC = 6V to 12V
  • Low Quiscent Current : ICCQ = 4ma (typ.) at Vcc = 9V
  • Variable Voltage Gain Because of Inverting Amplifier
  • Easy Arrangement for Dual 10 LED’s Driver by Series Connection of TA77666P and TA7667P

Please send your ideas, those are very important for our success…

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Comments (8)

  1. wasantha says:
    July 22, 2010 at 4:43 pm

    keep up the good standard

    Reply
  2. alan Alvin Dalagan says:
    March 18, 2011 at 12:55 pm

    it so wonderful……….

    Reply
  3. Gerald ezeh says:
    June 26, 2011 at 2:27 pm

    Pls highlight the schematic diagram because i can click on it

    Reply
  4. lal says:
    October 15, 2011 at 12:08 am

    good but difficult to find the pin 1 of the ic bcz it does not hav any mark for pin numberering

    Reply
  5. Norman Neil says:
    December 10, 2013 at 3:43 am

    If I was building a stereo amp using 2 LM386 chips would I need 2 TA7666 chips to display Left and Right channel volumes?

    Reply
  6. gayan sameera says:
    August 30, 2014 at 1:07 pm

    can i replace TA7668P for TA 7666P ??

    Reply
  7. rexmond says:
    February 7, 2015 at 8:51 pm

    difficult to find pin 1 please indicate for me thanks

    Reply
  8. Sampson says:
    July 7, 2015 at 11:24 pm

    Pls sir, am a little confuse based on how to put the indicator. will i put it to the input of the amplifier or the output of the amplifier, am little confuse on that section, pls i need your direction. Pls sir i will be waiting for your reply, thanks

    Reply

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