Temperature compensated V-Bias Circuit.
IC1 is STMicroelectronics
L200 (note max 40 volts for V-IN).
S1 is temperature switch mounted on heatsink.
Mount IC1 and X1 on heatsink next to output devices.
Note max 35 volts for V-IN (use zener with series
resistor to pre-regulate higher voltages).
Use a 10 or 25 turn 10K trimmer for VR1.
Depending on voltage regulator used additional components may
Mount on heatsink next to output devices.
Set to approximately 250 mV across a transformer primary.
Adjust with care!
Representative General Circuit.
This is the only part of the amplifier that has potentially
lethal voltages. Please take care when assembling and ensure that all live mains
connections are covered so that they cannot be accidentally touched by hand or
with a tool.
The power supply may be built into a separate enclosure.
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Additional information will be added in time.
The information contained here is
given in good faith but I cannot take any personal liability for the building or
use of any of the items described.
This page last modified on: 2nd March
All information, drawings and images Copyright © 1995 -
2005 Susan Parker unless