Hello Everybody,

I can remember some time ago when I wanted to make a circuit while I had to link two circuit together, one was a bridged dual voltage supply amplifier and the previous circuit was a single ended circuit (Sorry I am not remember what kind of circuit). I mentioned the question here but I no one gave me a perfect and pervasive response.

As a rule of thumb, is this possible to do that without any consideration to anything? I am not able to think about the wave form of the first stage and the second stage while the base voltages are different!

My opinion is that when I want to make a similar circuit I must convert the first stage to a dual supply circuit or the second stage to a single ended circuit,
But I guess I am not true

Any idea please?

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Good judgement comes from experience, experience comes from bad judgment

 

It is best to have two circuits have the same power supply method if they link together. Most circuits do not need a dual supply voltage. Bridged power amps are used in cars with just a single supply voltage.

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Uncle $crooge

 

See this please: http://www.alldatasheet.com/view.jsp?Searchword=LM1876
This power amplifier needs more components when used as single supply.
there is not any schematic about braided single supply too.

__________________
Good judgement comes from experience, experience comes from bad judgment

 

The LM1876 doesn't work very well as a bridged amplifier. Most bridged amplifiers have nearly 4 times as much power output when bridged because the voltage swing is doubled and the current is doubled. The LM1876 has only twice the power output when bridged but it gets 4 times as hot.

Here is a simple car amplifier IC that is bridged and has a single supply voltage. With a 14.4V supply its output power is 15W into 4 ohms at clipping:

Attached Thumbnails

 

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Uncle $crooge

 

the rule of thumbs, is to keep all the Grounds tied together, otherwize, the 2 circuits cannot 'communicate' together

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Ibrahim Kamal
check my electronics and robotics page: http://www.ikalogic.com/

 

Hmm...but what if one circuit has a Positive Ground and the other is Negative Ground?

 

Then unless you're using DC signals (in which case you need an isolation amplifier) join them with an AC coupling capacitor.

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I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

 

not so a single amp will have a bias on the output to make linear all you need is get rid of the DC how a cap.