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k8ik-stm/Electronics/README.md

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STM Original Electronics

This directory contains the documentation of the original control electronics of the STM. We did some modifications which are detailed below.

Overview

Block diagram of the STM

The Control Box schematic can be found in STM_Main_neu_Schaltplan_3.pdf.

The Preamplifier schematic is STM_Vorverst_neu_2.pdf.

Modifications

  • Preamplifier
    • [2025-06-14] Added a 1nF capacitor parallel to R10 to mitigate 12kHz oscillation and stabilize the amplifier.
  • Control Box
    • [2025-06-14] Disconnected R36 from R1/C1 and instead connected it to -15V through a separate 10k resistor. This inverts the setpoint voltage, which was necessary to make the differentiator actually calculate an error difference. Previously, it was summing the setpoint and control variable...
    • [2025-06-14] Cut out R8, the resistor parallel to the capacitor of the integrator (I-controller). This resistor was preventing the integrator from stably integrating at very low frequencies.
    • [2025-06-15] Added a 1µF capacitor parallel to C7. This mitigates 1.47 kHz oscillation when the amplifier gain is high.