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Simple Voltage Regulators Part 2: Output Impedance - …
https://www.tnt-audio.com/clinica/regulators2_impedance4_e.html
Two-transistor Shunt Regulator with High Gain. Our two-transistor shunt attained an output impedance of some 100 milli-Ohms. It did so over quite a wide frequency band, but limiting ourselves to below 10kHz or so, this is hardly better than what …
Simple Voltage Regulators Part 1: Noise - TNT-Audio
https://www.tnt-audio.com/clinica/regulators_noise4_e.html
Two-transistor Shunt Regulator. This is a variation of a simple shunt regulator design that has been floating around on the net. It is a unity-gain (thanks to the feedback through C1) amplifier that consists of gain-element Q1 and follower Q2.
Simple Voltage Regulators Part 2: Output Impedance - …
https://www.tnt-audio.com/clinica/regulators3_ripple_e.html
Both the shunt regulators have a 180 R resistor as their series dropping element, chosen to allow 15mA delivered to the load, and 15mA consumed in the shunt, for a 15V output voltage. Ripple rejection for regulator types: LM317 (red), TL431 …
Simple Voltage Regulators Chapter 2: Output ... - TNT-Audio
https://www.tnt-audio.com/clinica/regulators2_impedance2_e.html
Enhanced TL431 Shunt Regulator. In this circuit the 431 is used as an error amplifier only, its gain determined by resistor R6. The additional transistor, Q1, serves as the actual shunt element. The gain of the TL431 'amplifier' is used to reduce the impedance of that shunt transistor when the feedback loop is closed.
Simple Voltage Regulators Part 2: Output Impedance - …
https://www.tnt-audio.com/clinica/regulators2_impedance1_e.html
Addendum to Part 1: Noise. In the first installment of this series we had a look at the noise generated at the output of a number of easy to build and cheap voltage regulators: single-chip series and shunt regs (LM317/337 and TL431), a one-transistor emitter follower, and a two-transistor discrete shunt. The investigations were done by recording the AC-coupled output of …
Simple Voltage Regulators Part 1: Noise ... - TNT-Audio
https://www.tnt-audio.com/clinica/regulators_noise3_e.html
The TL431 is a 3-terminal shunt regulator which some in the DIY community attribute near-magical properties to. And yet, in audio industry it is nearly never used. It is a component with reasonable specs up to 100kHz, and if used in unity-gain mode: meaning that there is direct HF feedback from the voltage rail to the reference input, in the above schematic allowed by …
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