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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Easiest Line Level Amp ?
Easiest Line Level Amp ?
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Old 8th February 2006, 04:49 PM   #1
Modelworks is offline Modelworks  United States
diyAudio Member
Join Date: Jan 2006
Location: North Caolina, USA
Default Easiest Line Level Amp ?

I have a satellite receiver that seems to output a signal that is lower than my other devices on my stereo. What would be the easiest way to amplify the line level ouputs from the satellite to the inputs of the stereo ?

I can build almost any circuit, just can't design them
Would prefer something that uses generic parts rather than something that has to be ordered.

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Old 9th February 2006, 09:58 AM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

probably a simple dual op-amp (TLO72 ?) signal booster wired
into your satellite reciever. Selection of op-amp depends on
the power rails in the satellite reciever.

The actual circuit would be a simple AC coupled gain stage.
you can find many examples of thse on the internet.

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Old 11th February 2006, 09:16 AM   #3
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
TL072 will just about do the job, but it does not drive capacitive loads at all well.
The interconnect cable could add 20pF to 200pF across the load impedance.

Try using an NE5532 (5534 needs Ccomp or gain>5) which can drive these loads cheaply. Now available as SMD.
There are many other cheap and expensive ones but you would need to read the datasheets carefully to try to extract the pitfalls of each.

Try ESP site for a circuit board and schematic.

Are you looking for times 2 (+6db) or times 4 (+12db) gain?
or something a lot higher?
regards Andrew T.
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