Buffer 1:1 Nelson Pass

inped: input 40kohm, out 1kohm

perfect pentru potrivire inpedanta si adaugat timblul specific Jfets 2SK170

jfets perechi IDSS nu mai mult de 0.5ma curve tracer

componente cea mai buna calitate+proces pcb sursa+buffer medium conformal coating, lipituri high grade Oyaide SS-47

fara colorari/afectare rezolutie sunet.

sursa ultra lineara sigma 11 mosfet regulation:
All-discrete topology
Single-pass, series regulator design.
No IC (integrated circuits) are used.
Low noise, high PSRR
A constant-current source feeds a zener diode as a stable voltage reference. A low-pass filter (with a corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier. This is an effective yet lower-cost alternative to expensive voltage reference ICs. The low-pass filter also provides a soft-start characteristic.
The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB. The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio). This greatly improves the line regulation performance of the PSU.
A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load. The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.

High-current MOSFET pass transistors

The high current rating provides a very high safety headroom against overcurrent damage.