|Chip Amps Amplifiers based on integrated circuits|
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|9th October 2009, 12:35 PM||#1|
Join Date: Oct 2009
How to add headphones to a T-amp 2020?
I bought a little amp - a Lepai LP-2020 (T-amp 2020 class) but I can't find anywhere to plug headphones in
click here to see it (ebay page showing various photos of the device)
i want to plug ipod-style headphones in to it. does anyone know if this is possible?
|9th October 2009, 03:23 PM||#4|
Join Date: Apr 2004
Agreed, although most commercial amps just put 330 ohms in series, and presumably rely on the headphones impedance to perform the function of R2.
|9th October 2009, 03:23 PM||#5|
Join Date: Apr 2004
|9th October 2009, 09:30 PM||#6|
Join Date: Feb 2004
I see no one has mentioned yet that the output is bridged, meaning there will be VCC/2 on the output when referenced to ground. Sure, a cap in series can solve this, but then what about changing the output filter value for the higher load?
Point: This is a bad choice for a headphone amplifier.
|14th September 2012, 08:45 AM||#8|
Join Date: Sep 2012
This is the data sheet about it,I think it can help you:
RCA Input ,Can be plug in with Ipod,MP3/MP4
Mini size easy to installation by DIY without manual, especially good fit for car, motorcycle bike,boat, every where!
Compact Size: 120mm (D) X 147mm (W) X 42mm (H) weight:280g
It has Blue LED light ring round Volume Knob;Bass/Treble tuning.
Aluminum alloy solid case and also easy to distribute the heat.
Speaker output protection
Use SMD components
Latest 2011 New version
T-Amp IC Tripath TA2020-20
Output Power of Tripath TA2020:2 x 20W @ 4ohm, 2 x 12W @ 8ohm
Signal-to-Noise Ratio (SNR) 98dB
Dynamic Range 98dB
IHF-IM Distortion 0.1% @ 1W, 4ohm
0.03% @ 9W, 4ohm
0.1% @ 10W 4ohm
0.1% @ 6W 8ohm
10% @ 23W 4ohm
10% @ 13W 8ohm
81% @ 20W, 4ohm, 88% @ 12W, 8ohm
Input Sensitivity 200mV
Audio IN: RCA X1 & 3.5mm earphone jack x 1
Power socket (5.5mm/2.1mm) x 1
Speaker OUT (Left) x 1 pair (+ / -)
Speaker OUT (Right) x 1 pair (+ / -)
Power Indicator (Blue LED) x 1
Power Supply input DC 12V~14.6V5A
(W)147mm x (H)42mm x (D)120mm
|14th September 2012, 09:54 AM||#9|
Join Date: Nov 2003
Location: Brighton UK
It doesn't have a headphones output for two reasons :
1) the common earth wiring of headphones is problematic for bridged amplifiers.
2) Its assumed a typical source device would be able to drive headphones directly.
What is the source device ?
There is nothing more practical than a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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