Moritz Klein Courses

Designing a Double Wavefolder From Scratch

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Build a harsh, metallic-sounding double wavefolder from transistors and op amps, learning how waveform folding creates complex overtones in synthesizer signals.

• YouTube
• 22 minutes
• Self-Paced
• Free Video

Designing a Simple Analog Kick Drum from Scratch

Learn to design and build a simple analog kick drum circuit, covering oscillators, envelopes, and modulation techniques for creating punchy, customizable bass drum sounds in modular synthesizers.

• YouTube
• 39 minutes
• Self-Paced
• Free Video

Designing a Simple Audio Compressor from Scratch

Design an analog audio compressor from scratch using diode VCAs, op-amps, peak detection, and adjustable attack, release, ratio, and sidechain controls.

• YouTube
• 29 minutes
• Self-Paced
• Free Video

Designing a Simple 5-Step Sequencer From Scratch

Build a simple 4017-based five-step sequencer with CV and gate outputs for controlling a synthesizer.

• YouTube
• 32 minutes
• Self-Paced
• Free Video

Designing a Sample and Hold Circuit from Scratch

Design a JFET-based sample-and-hold circuit for modular synthesis, exploring accurate sampling, capacitor droop, trigger pulses, buffering, and component trade-offs.

• YouTube
• 31 minutes
• Self-Paced
• Free Video

Designing a Classic Transistor-VCA From Scratch

Design a classic transistor-based voltage-controlled amplifier, from voltage dividers and common-emitter gain through a differential pair and a working modular-synth circuit.

• YouTube
• 49 minutes
• Self-Paced
• Free Video

Designing a Simple ADSR-ish Envelope Generator from Scratch

Build a simple ADSR-like envelope generator from scratch with resistors, capacitors, diodes, and op-amp comparators for a DIY modular synthesizer.

• YouTube
• 31 minutes
• Self-Paced
• Free Video

Turning My Diode Ladder Filter Into a Eurorack Module

Refines a diode ladder filter with high-pass and band-pass modes, improved CV control, and a finished Eurorack module prototype.

• YouTube
• 35 minutes
• Self-Paced
• Free Video

Complete Beginner's Guide to Using a Breadboard

A practical beginner's guide to translating simple synthesizer schematics into working LED, inverter, and oscillator circuits on a breadboard.

• YouTube
• 21 minutes
• Self-Paced
• Free Video

Designing a Diode Ladder Filter from Scratch

Design an analog diode-ladder voltage-controlled filter from scratch, including its multi-pole circuit, CV processing, output stage, and resonance.

• YouTube
• 36 minutes
• Self-Paced
• Free Video

DIY Synth VCF - Resonant High-Pass & Vactrol-Based Voltage Control

Build a voltage-controlled resonant high-pass synthesizer filter using homemade vactrols, LED driving, voltage mixing, and modified capacitors.

• YouTube
• 29 minutes
• Self-Paced
• Free Video

DIY Synth VCF - Active Filters & Resonance

Build an active analog voltage-controlled filter, analyzing op-amp amplification, resonance, feedback, distortion, and diode clipping.

• YouTube
• 28 minutes
• Self-Paced
• Free Video

DIY Synth VCF - Analog Filtering Basics

Build passive first- and second-order low- and high-pass filters from basic components, tracing how resistor-capacitor networks reshape audio waveforms.

• YouTube
• 22 minutes
• Self-Paced
• Free Video

DIY Synth PSU - How to Design a Simple Dual Power Supply

Design and build a simple dual power supply for self-built synthesizer modules, covering rectification, filtering, regulation, ripple, decoupling, and protection.

• YouTube
• 26 minutes
• Self-Paced
• Free Video

DIY VCO - Shaping Sawtooth to Square

Build an analog VCO from scratch with thermistor temperature stability, variable pulse width, fine tuning, and modular-standard 10V peak-to-peak outputs.

• YouTube
• 27 minutes
• Self-Paced
• Free Video