Capacitance Multipliers

189

01:43:01

On the left: Darlington pair capacitance multiplier (2pcs NPN transistor)
On the right: Sziklai (Compound) pair capacitance multiplier (1pcs NPN + 1pcs PNP)

The resistor before the capacitors emulates the ESR. On lower frequencies it is does not matter. On high frequencies makes difference.
The capacitance appearing at the base of the output device is effectively multiplied by the gain of the device.
You can adjust the voltage drop with the resistor to sink current to ground from the capacitor. You need to adjust the voltage drop to bigger than the voltage ripple.


https://sound-au.com/project15.htm
https://sound-au.com/articles/cmpd-vs-darl.htm
https://youtu.be/wopmEyZKnYo

Sziklai (Compound) Pair β = βQ1 × βQ2 + βQ1
Darlington Pair β = βQ1 × βQ2 + βQ1 + βQ2

published 6 years ago

hurz

6 years ago

yes this is sometimes called capacitance multiplier. And what factor does it multiply?

bandesz

6 years ago

https://sound-au.com/articles/cmpd-vs-darl.htm

bandesz

6 years ago

https://sound-au.com/project15.htm

hurz

6 years ago

thats the reason for my retoric questions, place all references and links into the description, voila good publication with credit to the source. Lets see

PTamas

5 years ago

Jó lett a demo, kár, hogy nincs Sziklairól magyar wikipédia oldal. 😒

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