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Another low distortion buffer
Another low distortion buffer
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Old 24th February 2014, 07:02 PM   #1
jerluwoo is offline jerluwoo  United States
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Default Another low distortion buffer

Just a simple circuit I've been playing with.
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Old 26th February 2014, 05:35 AM   #2
RNMarsh is offline RNMarsh  United States
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Another low distortion buffer
Do you have any distortion numbers for it. Waveforms at clipping. A way to adjust offset so that the input coupling cap (C3) can be eliminated?


THx-RNMarsh
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Old 26th February 2014, 12:29 PM   #3
jerluwoo is offline jerluwoo  United States
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2Vrms into 1kohm - .004% @ 1kHz - .008% @ 20kHz
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Old 27th February 2014, 10:36 AM   #4
AndrewT is online now AndrewT  Scotland
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Is the output rail to rail?
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Old 27th February 2014, 05:37 PM   #5
RNMarsh is offline RNMarsh  United States
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Another low distortion buffer
Very nice and with only 5 transistors.

-RNM
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Old 6th March 2014, 02:31 AM   #6
ammel68 is offline ammel68  United States
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Another low distortion buffer
Since it doesn't look like jerluwoo is going to answer my PM, I'll ask here if anyone knows where one can get the BC550/560 transistors in this design?

A Google search didn't turn up much. Are these old transistors?

Thanks...
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Old 6th March 2014, 09:33 AM   #7
AndrewT is online now AndrewT  Scotland
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a multi source old transistor that performs very well within it's limits and is generally easily available at very low prices.

Now also available in sot23 (SMD).
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Old 6th March 2014, 12:45 PM   #8
sgrossklass is offline sgrossklass  Germany
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BC550B/C (npn) and BC560B/C (pnp) are the European generic low-noise / high-beta transistors. They must have been made since the late '70s or so? You can get transistors with higher Vceo for this level of Cob and beta nowadays, and their Rbb' still is above 100 ohms, but still when you need a cheap small-fry transistor that'll keep its beta well at small Ic and doesn't need to sustain any outlandish voltages, these aren't a bad bet.

Surface mount versions are called BC850 and BC860, respectively.
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Old 6th March 2014, 05:33 PM   #9
ammel68 is offline ammel68  United States
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Another low distortion buffer
From looking at the data sheets, the Hfe goes up as you go from the A, B, or C versions.

Jerluwoo shows the "A" version for the BC560 and "B" version for the BC550.
Will substituting the "C" version, which seems easier to find in the TO-92 style, still work in the above circuit or does one have to use the "B" versions for the 550 and "A" version for the 560?

Thanks...
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Old 6th March 2014, 05:48 PM   #10
keantoken is offline keantoken  United States
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The BC5xx transistors also have exceedingly good low-Vcesat behavior, something that I haven't seen in any of the higher voltage "equivalents".
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