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Amplifiers why to have large input impedance to an amplifier???????????

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Generally speaking, amplifiers are designed with high input impedance so they don't load down or distort the input signal. Vacuum tube and MOSFET input stages are characteristically high impedance. Of course high impedance inputs are susceptible to noise because of the ease with which currents are introduced by stray capacitance or direct electromagnetic field interaction.

Posted on Jan 01, 2009

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Can i hook this amp to my home sound system


Technically, yes, but there are some challenges. First, the input voltage to the amp is 12VDC, not 120VAC. You would need to find a power supply large enough to supply 12VDC at 30-40 amps (plus has proper currently limiting or fuses to protect against overloading). Second, most home speakers are 8 ohm impedance. While the amp can power an 8 ohm speaker, the output power is cut in half (compared to a 4 ohm speaker).

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What is a opamp


An opamp is an operational amplifer. The OPA134 is a single amplifier with differential inputs. The best way to describe this IC is that it is an ideal amplifier with infinite gain, with high input impedance and low output impedance making it both a voltage and current amplifier. The output signal is divided with resistors and provides feedback to the minus input to inject negative feedback. The ratio of this feedback basically determines the final gain. The input signal may go to the positive input for a non-inverting amplifier or to the negative input for an inverting amplifier. Roughly the voltage gain in dB will be 20 x log of Vout/Vin. There is a difference in the gain of 1 between inverting and non-inverting for accuracy sake, but that is the basics.
This particular part is very high quality in performance and should be replaced with the equivalent part or one from Burr-Brown. The power supply is typically +/- rails and ground is usually the virtual point between the split supplies representing 0V. Sometimes the input signal will not be referenced to ground and will be fed to both the plus and minus inputs which will be balanced (impedance wise) to form a differential input that rejects common signals such as noise. Pretty cool device, I couldn't live without them. OPA134 Precision Amplifier Operational Amplifier Op Amp Technical documents

Jan 10, 2014 | Texas Instruments OPA134PA IC, AUDIO,...

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What is impedance?


Check the impedance on the back of the speakers usually listed, and if you are lucky so is the power rating. The general rule is the amplifier should equal the power rating of the speakers for maxium performance or more. If you have a digital meter set it to ohms and measure impedance at the speaker input, if you have a model number do a general search to find out more additional imformation.

May 29, 2012 | Radio Shack Audio Players & Recorders

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Not powering on


To troubleshoot amplifiers when it's not starting up

check the base to base voltage of driver transistors might be too high.

Make sure that the amplifier's ground wire is tightly attached. If it doesn't look too good then take it out and clean it. Use a metal brush to clean that area.

Low power may cause your amplifier not to turn on. Make use of voltmeters to check if your amplifier is getting the right amount of power for it to work. Amplifiers need 110 volts or less to function if the power coming in does not reach that it means you have la defective power cable. If the power is alright and it reaches a minimum of 110 volts, and your amplifier still doesn't turn on that means that there is a problem with its power supply. Checking an inline fuse helps you to determine the appropriate amp ratings when you troubleshoot amplifiers. This is the best way to troubleshoot amplifiers with power problems.

To troubleshoot amplifiers that seems to be on standby mode

Look into your input sensitivity. An input control allows you to match output voltage that is coming from the main unit going to the amplifier then to the stereo speaker. The amplifier shuts down if the gains are
adjusted too high. This is simply because it overheats when it is set too high thus it automatically shuts off. When you troubleshoot amplifiers and this happens you will notice that the volume gets lower even if the setting is too high. Be aware of the optimal levels of the components when you troubleshoot amplifiers.

Your speaker's electrical impedance may also contribute as to why your amplifier may be turned on but doesn't seem to work. Impedance is the amount of current which flows with a specific voltage throughout the transistors, capacitors, etc. Just see to it that your amplifier and speakers equal in impedance range when you troubleshoot amplifiers. Use the voltmeter to check the impedance range when you troubleshoot amplifiers.


Take care..

Sep 14, 2011 | Audio Players & Recorders

1 Answer

Does the input signal to the xti 2002 amp make adifferance balanced or un?


The balanced line input will be used for long runs to eliminate noise. it is low impedance.the high impedance line (unbalanced) is ok for sort runs such as in a rack. if you were say running output from a mixer 50' away you want to use the balaced output on the board and the balanced input on the amp.

Aug 31, 2011 | Crown XTi 2000 2-Channel Amplifier

1 Answer

Everytime i hook ipod upthe powere cuts off


Possible that the ipod is giving some errors like a high input which is not matching to the amplifier and so make the protection cut off.
Reduce the voltage of the ipod, connect the ipod using a cord that has a impedance matching circuit to the input of the amplifier.
if you are using the earphone output to the aux input it is a mismatch, so the impedance must be matched with a resistor network.... converting a low to a high impedance.

Sep 29, 2010 | Panasonic Home Theater System System

1 Answer

I hooked up 2channel 500 watt amplifer and 1200 watt 300 rms subwoofer now the protection light comes on when i turn up volume


your speakers rating is too low for your amplifier. 300 watts RMS means the speaker can operate on an average of 300 Watts continuously. the 1200 watt rating is peak wattage input and meant for intermittent intervals only, a like a bass drum beat count. also , your speaker impedance must match your amplifier impedance or the speaker must be a higher impedance than the amplifier. Never lower than the amplifier's impedance output rating. If The amplifier is rated into an 8 ohm load, your speaker must be 8 ohms or higher. in other words you cannot use a 4 ohm speaker or you will damage the amplifier .

Mar 14, 2010 | Car Audio & Video

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My amp goes into protection mode when i turn on my car. It gets hot too. I had 2 kicker 12" l5's and blew the subs with that amp, could i just have a simple problem with the amp? What are all my options?


Protection LED on, no output? Amplifi er is very hot = thermal protection is engaged. Test for proper
impedance at the speaker terminals with a VOM meter (see the diagrams in this manual for minimum
recommended impedance and multiple speaker wiring suggestions). Also check for adequate airfl ow around
the amplifi er. Amplifi er shuts down only while vehicle is running = voltage protection circuitry is engaged.
Voltage to the amplifi er is not within the 10–16 volt operating range. Have the vehicle’s charging and electrical
system inspected. Amplifi er will only play at low volume levels = short circuit protection is engaged. Check
for speaker wires shorted to each other or to the vehicle chassis. Check for damaged speakers or speaker(s)
operating below the minimum recommended impedance.
No or low output? Check the balance control on source unit Check the RCA (or speaker input) and
speaker output connections.

Jan 29, 2010 | Kicker ZX10001 Car Audio Amplifier

1 Answer

Why to have input impedance very large an amplifier?????????


you have to match input impedance to have a smooth transfer of power from one stage or component to the next, if the impedances dont match some of the power is reflected back and can damage the signal strength or even the equipment.

Jan 01, 2009 | Audio Players & Recorders

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