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====== Welcome ======

Welcome to my collection of electronic schematics and experiments.

I’m not a professional engineer or electronics designer - just an enthusiast who enjoys exploring circuits, learning how things work, and experimenting with ideas. Over time I’ve collected and modified a variety of schematics that I found interesting, useful, or simply fun to build and test.

This site is a place to share those experiments with other curious minds who enjoy electronics, DIY projects, and hands-on discovery. Some circuits may be original variations, others are inspired by existing designs, and many are works in progress. They are shared here in the spirit of learning, collaboration, and experimentation.

If you’re an experienced engineer, a hobbyist, a student, or simply someone interested in electronics, I hope you find something here that sparks ideas or encourages you to build and explore further.

Please remember that these schematics are experimental and should be used responsibly and safely.

If you feel inclined, you can also send me a small donation via [[https://paypal.me/TheAstro30|Paypal]] - even as little as $2 AU is appreciated.

Enjoy exploring!

===== Safety Disclaimer =====

Some projects featured here involve elevated DC voltages and mains-powered circuits. These voltages can cause serious injury, electric shock, or death if handled incorrectly. Proper safety precautions should always be observed when building, testing, or modifying electronic equipment.

If you are inexperienced with mains wiring, high-voltage electronics, or electrical safety procedures, do not attempt to work on these projects. Always use appropriate isolation, protection equipment, and safe working practices.

**__Please note__: This is a work in progress, and stuff is added/updated in my down-time from working and when I don't have any video content to make. It also takes time to draw schematics and/or simulate circuits I haven't built yet.**

===== Project List =====

==== Preamplifiers & Accessories ====

[[discrete_opamp|Simple Discrete Operational Amplifier]]\\
[[discrete_preamp|Discrete Stereo Preamplifier]]\\
[[bass_guitar_headphone_amp|Bass Guitar Headphone Amplifier]]\\
[[ne5532_stereo_preamp|NE5532 "Minimalists" Stereo Preamplifier]]

==== Power Amplifiers ====

[[2011|AEL-2011 50W Power Amplifier]]\\
[[2026|AEL-2026 50W Power Amplifier]]\\
[[maplin50w|Maplin 50W Power Amplifier]]\\
[[workhorse|The "Workhorse" 200W Power Amplifier]]

==== Power Supplies & Accessories ====

[[dual_transformer|Dual Mains Transformer Switching]]\\
[[simple_speaker_protector|Simple Loudspeaker DC Protector]]\\
[[series-pass|+/-15V Regulator For High-Powered Amplifiers]]\\
[[single-ac|Deriving A Bipolar DC Supply From A Single AC Wall Adaptor]]

===== Useful Tools =====

[[problem-solving|Problem-Solving Flow Chart]]\\
[[ohms_law|Ohm's Law]]\\
[[resistor_color_codes|Resistor color code chart]]\\
[[led_resistor|Calculating a dropper resistor for LEDs]]

===== Miscellaneous Articles =====

[[astro_meter|The perfect multimeter for me]]\\
[[op_amp_basics|Op-Amp Basics]]\\
[[cassette_deck_tape_chewing|Why cassette decks can chew tapes]]\\
[[integrator_phase_shifter|Signal Integrator/Phase Shifter]]