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DC Power Amplifier
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bocek ilaclama
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PostPosted: Tue Oct 19, 2010 2:14 pm    Post subject: bocek ilaclama Reply with quote

thanx Cool
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pradap



Joined: 22 Oct 2010
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PostPosted: Fri Oct 22, 2010 10:06 am    Post subject: Reply with quote

Whilst most audio amplifiers have DC coupled outputs, very few if any will operate at DC since they are usually AC coupled at some stage in the signal path. Thus you should expect significant distortion of square waves at frequencies below about 10 Hz.A simple half or full bridge arrangement from the power supply might be more appropriate and easiest to do (Solid state relay idea of Gatomas). If you decide to go that way, ensure you use good (short and thick) wiring layout and diodes to catch any fly-back emf in the load is inductive
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Thu Oct 28, 2010 8:22 am    Post subject: Reply with quote

If you need current feedback to get a correct waveform through an inductive load, please take a look at the designs used in vertical deflection circuitry of TVs and monitors. The datasheet of any vertical output IC from the 80's or 90's will give you a lot of hints. A such design will be much simpler if you don't use a H-bridge topology but instead connect the "cold" end of the load to ground via a measurement shunt.

The drawback of using a single-ended amplifier is that it will need twice the supply voltage of a bridge amplifier, and it will cause more ripple on the supply needing a better regulation or big filter capacitors that can withstand the ripple current.
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szoasis



Joined: 23 Nov 2010
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PostPosted: Tue Nov 23, 2010 7:03 am    Post subject: Reply with quote

Square waveform involves high frequency components and at such low rate and high frequencies I wonder if a solid state rely would do the trick.
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