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Unity-gain "amp" for high-efficiency speakers
Unity-gain "amp" for high-efficiency speakers
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Old 20th January 2021, 08:05 PM   #11
marconi118 is online now marconi118  Germany
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2v rms in 100db speakers is ok for normal level listening

go for the mofo you wont regret
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Old 20th January 2021, 09:52 PM   #12
U230421 is offline U230421
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Quote:
Originally Posted by mudihan View Post
I believe the calculator assumes that Vmin would be negative 5.7v, i.e., Vmax is half of Vpp.
I doubt...
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Old 20th January 2021, 09:53 PM   #13
mudihan is offline mudihan  United States
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Originally Posted by MarsBravo View Post
I doubt...
Vmax to Vrms conversion calculator.
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Old 21st January 2021, 02:37 AM   #14
U130421 is offline U130421  Antarctica
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I use 600/10k adapter transformer 24$/pair at the input.
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Old 21st January 2021, 08:44 AM   #15
U230421 is offline U230421
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Quote:
Originally Posted by mudihan View Post
I believe the calculator assumes that Vmin would be negative 5.7v, i.e., Vmax is half of Vpp.
You 'believe'... and 'the calculator assumes'... that's what I doubt.
Naming the half of Vpp as Vmax is confusing, name it Vp instead.
So still the question: what are the measured/actual/real voltages from the DAC output? Is this DAC running on +/-6Vdc (+/-5.7 Vpp out) or +6/0Vdc (+5.7Vpp out)?
1/2√2 is only valid for sine waves, but in general accepted for common (audio) signals.
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Old 21st January 2021, 09:07 AM   #16
marconi118 is online now marconi118  Germany
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Originally Posted by kokoriantz View Post
I use 600/10k adapter transformer 24$/pair at the input.
Where did you get them?
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Old 21st January 2021, 02:24 PM   #17
mudihan is offline mudihan  United States
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Quote:
Originally Posted by MarsBravo View Post
You 'believe'... and 'the calculator assumes'... that's what I doubt.
Naming the half of Vpp as Vmax is confusing, name it Vp instead.
So still the question: what are the measured/actual/real voltages from the DAC output? Is this DAC running on +/-6Vdc (+/-5.7 Vpp out) or +6/0Vdc (+5.7Vpp out)?
1/2√2 is only valid for sine waves, but in general accepted for common (audio) signals.
See attached.
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Old 21st January 2021, 04:57 PM   #18
xrk971 is offline xrk971  United States
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Unity-gain "amp" for high-efficiency speakers
It’s not a fancy discrete Class A amp, but you could use a couple of TPA6120A2 Class AB unity gain headphone amp chips in parallel and drive 8ohms. Those chips can have up to +/-15v rails. Capable of 700mA each so 1.4A when in parallel. Probably would drive 100dB sensitive speaker more than loud enough. These chips have phenomenal performance specs with regards to noise and distortion.

https://www.ti.com/lit/ds/slos431b/slos431b.pdf
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Old 21st January 2021, 06:00 PM   #19
marconi118 is online now marconi118  Germany
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I would vote for a mini mofo with 800mA bias.
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Old 21st January 2021, 06:09 PM   #20
dkfan9 is offline dkfan9
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More Class-A Amplifiers

Skip to the second half for something like what you're looking for.

If you go to the main page and ctrl+f "power buffers" he's got more posts on the topic.

Last edited by dkfan9; 21st January 2021 at 06:09 PM. Reason: excess space between lines
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