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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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8th July 2003, 10:17 AM
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 op amps hi. if i make an amplifier with an op amp, and just want to use a battery or single power supply, i can connect the negative supply to earth. Does that make the output have a buzzing sound when a speaker is connected? also if i want to make an amp using an opamp with one power supply, but want to power it with + and - 12V is there a schematic i can use to make it? Cheers. Josh. | |
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8th July 2003, 04:45 PM
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| Hi Josh, If you go with the single supply (+ volt only supply) make SURE you use a single-supply op-amp. Preferrable a single-supply rail-to-rail op-amp.
__________________ BSEE | |
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8th July 2003, 05:53 PM
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__________________ BSEE | |
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4th November 2006, 01:26 AM
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| is the 6142 a good op-amp, or are there better single-supply rail-to-rail op-amp?
__________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net | |
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4th November 2006, 02:02 AM
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| What I need is an op amp with a single single supply (+5v) that can produce accurate results with 10mV to 1V inputs running a gain of 5.
__________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net | |
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4th November 2006, 02:35 AM
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| An opamp by itself doesn't have enough output current to drive a speaker. It needs to drive a complimentary pair of output transistors to boost its output current. The amplifier will have a DC output voltage if it has a single supply and will need an output coupling capacitor to block the DC from reaching the speaker. Two of these amplifiers can be bridged for up to nearly 4 times more power to a speaker, then an output coupling capacitor is not needed. Many IC amplifiers are made for cars and are bridged. A TDA2005 is a mono bridged amplifier IC and a TDA1554 is a stereo bridged amplifier IC. They produce about 14W RMS at clipping per channel into a 4 ohm speaker with a 13.2V supply. They produce more power (20W) when driven into severe high distortion and a 14.4V supply. Speaker buzzing? Maybe the amplifier is clipping because its volume control is set too high. Any opamp will operate fine from a single supply voltage if its inputs are biased correctly. Like this:
__________________ Uncle $crooge | |
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