3 Band Equalizer Not Working

[adason]

When it is powered up, and you touch any of the parts in feedback, better even from the bottom, do you hear the hum?

 

[MikePP]

Gotta be a wrong connection, flipped polarity, etc.

Yup

Just to reassure you, many circuits won't work right the first time, since
there are too many places to make a mistake. Not at all unusual.

Yup - as I said welcome to the world of electronics theory and actual practice.




Even the slightest tiniest whisker of solder bridging a vero track (or even if it's coppered or plain perf board) and the circuit can be stopped in its tracks

 

[rayma]

I'd really like to know the DC voltage on the (-) input, and the output.

 

[adason]

I want to know if he connected signal ground with non-inverting opamp input. It's not drawn in his schematics, so there is possibility he did not.

 

[Zohaib Ahmad]

This is just a very close variant (read copy) of this:

Thanks For Shematic I Will Definately Try This One

 

[Zohaib Ahmad]

have a look at the numbers i have drawn at the opamp......

Yes Absolutely My Pin Points Are Correct As You Given In Picture

 

[Zohaib Ahmad]

When it is powered up, and you touch any of the parts in feedback, better even from the bottom, do you hear the hum?

Yes When I Powered On The Amplifier I Heared Hum Sound Only

 

[Zohaib Ahmad]

Welcome to the reality of electronics :

Now measure the operating points and come back with results

Thank You Once Again And Thanks Every One For Sharing Your Rare Time With Me
I Will Check My Circuit Properly Once Again
After Checking My Circuit I Will Come Here Again

 

[Zohaib Ahmad]

I want to know if he connected signal ground with non-inverting opamp input. It's not drawn in his schematics, so there is possibility he did not.

I Have Not Connected Signal Ground With Non Inverting OpAmp I Have Just Made The Circuit According To The Given Shematic Did You Know What Is Deep Fault In The Circuit???

 

[Zohaib Ahmad]

When it is powered up, and you touch any of the parts in feedback, better even from the bottom, do you hear the hum?

Yes When Amplifier Is Powered Up I When I Touch Any Part Of Circuit It Gives Very Loud Humm Soind

 

[adason]

That's a good sign.

 

[adason]

I Have Not Connected Signal Ground With Non Inverting OpAmp I Have Just Made The Circuit According To The Given Shematic Did You Know What Is Deep Fault In The Circuit???

Well, there is your problem.
There is no deep fault in the schematics.
You are missing some knowledge. Ground connections are not drawn, its assumed you know where ground goes.

 

[Zohaib Ahmad]

Thanks Adason Now I Know Well About
Proper Connections

 

[adason]

like this

 

[Zohaib Ahmad]

Thanks Adason I Really Appreciate The Way Of Your Explanation
But What Value Of Resistor Should Be For DC Input??
If I Put 10k Resistor on Both + - Side Then Circuit Little Bit Works But If I Remove 10k Resistor On Both Sides
Then The Circuit Did not Work It Gives Only Hmm Sound Only At High Or Low Volume

 

[adason]

what do you mean DC Input?
whole circuit is cap coupled, there is no DC Input
You need to learn some stuff before you post questions

 

[rayma]

I Have Not Connected Signal Ground With Non Inverting OpAmp I Have Just Made The Circuit
According To The Given Shematic Did You Know What Is Deep Fault In The Circuit???

All grounds connect together, including the power supply ground.
The schematic was not complete.

 

[MikePP]

….and here’s me thinking it was a slightly abstract and rough sketch , roughly drawn with some things omitted (just on paper 0.

i.e. I thought he’d just accidently left them off the diag, but he’d actually joined the dots in the actual product

 

[Zohaib Ahmad]

what do you mean DC Input?
whole circuit is cap coupled, there is no DC Input
You need to learn some stuff before you post questions

I Just Want To Say That IF I Give Proper +-15v Supply The Circuit Does Not Work But When If I Put 10k Resistor on On Both +- Sides Not On Ground Then Circuit Works Again
Any Way Thanks For Teaching Me Some Major Basics Of Electronics.

 

[adason]

nothing what you say makes sense
i am out