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class A Buffer
class A Buffer
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Old 10th January 2016, 03:33 PM   #91
misterzu is offline misterzu
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..yet another class A buffer idea (didn't test in HW yet)
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Last edited by misterzu; 10th January 2016 at 03:54 PM.
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Old 16th January 2016, 09:47 PM   #92
theophile is offline theophile  Australia
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I'm just lurking here.
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Old 30th June 2020, 09:10 PM   #93
laserscrape is online now laserscrape
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Originally Posted by Calvin View Post

You may omit with R4. R5 has negligible impact and may be raised to 1k.
C3 should be a bipolar cap.
- You may split R1 in two resistors with increased value (5K-10k) and add a cap of a few F from the resistor mid-joint to the negative supply.
- You can omit with the output coupling caps using a active DC-servo that controls the idle current of the ccs, and a bias voltage and a source resistor for the MOSFET.
For an example of the servo circuit see my website calvins-audio-page.jimdo.com/ideas-and-circuits/buffers/hybrid-buffer-en/.
Scroll down to "Calvin-Buffer plus dc-servo".

Hi, Calvin
I checked out your site but couldnt find that servo, however I came across your page on BJT buffers and something stuck out.
Regarding emitter followers you mention :
''As can be seen in the pictures, the circuit works with a single supply voltage, but can also be used with a dual symmetrical operating voltage. With good transistor matching and clean adjustment, the output capacitor can then be dispensed with.''
I did not think this was possible for EF circuit without a servo, and this is exactly why I am searching for servo.
Would you mind elaborating more on that circuit, an EF without output coupling cap?


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