Ko Tilman Lulu

2 -10 MHz Shortwave radio receiver (book)

Overview from my published books radiofun232 on the Lulu website

Developing audio filters for a good sound in a living room or else via a 1 trans amp demo & schemat.

prevent hum in homebrew audio amplifiers

About coils in the 10 uH - 10mH range (also for Shortwave) buy/test/save them on their inductance

Trying to find the resonance frequency for an antenna coil on LW at 183 KC Radio tech physics pt. 1

1 transistor Active antenna/HF Preamplifier (tunable) for SDR and Shortwave schematic & demo

Carbon - Aluminum Battery, with NaCl (=kitchen salt) as an electrolytic fluid, demo/setup/results

LM 386 0.3 Watt audio amp with noise reduction for a Shortwave radio demo + schemat. of the end-amp.

Mammoth leaf (Gunnera manicata Linden) in the botanical garden in Essen, Germany, 2023

Making a 2 tube stereo audio amp with the triode pentode ECL 80 first ideas and good practice, Pt1

how to make a tone control circuit (Baxandall)

VLOG Developing a classic class B amplifier with 2N3055 NPN & 2955 PNP & a 741 Chip first results

5-8 Watt high quality and pure sound & @versatile audio amp (schematic)

About radio signals transported by wires & electronic wiring. Are short wires always necessary? VLOG

About the "Wireless World" Circard books of the 1970s on the Worldradiohistory dot com website

VLOG about radio technology of the 1920s and the 1950s: loop antenna & IF coils & capacitors & more

Electronic circuits that I made during 2022-2023. DEMO & VLOG: regulator/oscillator/timer/audio etc.

Ground loop hum (50 Hz or 60 Hz) in audio amplifiers: what is the cause and how to cure it?

Metronome circuit easy to make schematic & demo (only 2 transistors and a 9 Volt battery)