radiofun232

Oscilloscope homebrew: a first basic CRT setup to to test electronic components and even more (pt 2)

Oscilloscope homebrew: a first basic CRT setup to to test electronic components and even more (pt 2)
Electrostatic Cathode Ray Tube B7S2 from Eastern Germany: how to get it working & first ideas/setup

Electrostatic Cathode Ray Tube B7S2 from Eastern Germany: how to get it working & first ideas/setup
Easy measuring of very low resistances, say below 3 Ohm. Proof/principle and a working demo/schemat.

Easy measuring of very low resistances, say below 3 Ohm. Proof/principle and a working demo/schemat.
1970s squarewave/triangle wave oscillator: 50 Hz-1MC the original schematic/demo, ground =

1970s squarewave/triangle wave oscillator: 50 Hz-1MC the original schematic/demo, ground = "flowing"
4 transistor squarewave generator of the 1970s going from 50 Hz - 1 MC Schematic & demo & properties

4 transistor squarewave generator of the 1970s going from 50 Hz - 1 MC Schematic & demo & properties
Drop voltages out of a power supply with a few Silicium diodes in a row, each one drops 0.7-0.8 Volt

Drop voltages out of a power supply with a few Silicium diodes in a row, each one drops 0.7-0.8 Volt
Self oscillation & transport of electromagnetic energy through air. Schematic and basic demo

Self oscillation & transport of electromagnetic energy through air. Schematic and basic demo
Test circuit (schematic) to find out the optimum resonance of a (small) mains or other transformer

Test circuit (schematic) to find out the optimum resonance of a (small) mains or other transformer
Different types of power transformers for 50/60 Hertz: about electromagnetic fields and much more

Different types of power transformers for 50/60 Hertz: about electromagnetic fields and much more
Making a mains power supply 110/230 V at 50/60 Hz for a string of Christmas LEDS, working on 3 V DC

Making a mains power supply 110/230 V at 50/60 Hz for a string of Christmas LEDS, working on 3 V DC
How to get a transformer into self oscillation on its natural frequency: principles, demo, schem.

How to get a transformer into self oscillation on its natural frequency: principles, demo, schem.
Loudspeaker 4-32 Ohm used as microphone, old video re-uploaded and told more about it (schematic)

Loudspeaker 4-32 Ohm used as microphone, old video re-uploaded and told more about it (schematic)
Experiment on materials to wind radio coils on. Talking about damping and more (VLOG)

Experiment on materials to wind radio coils on. Talking about damping and more (VLOG)
Useful 3 transistor oscillator for kind of square & needle waves, 400 Hz to 5 KC schematic & demo

Useful 3 transistor oscillator for kind of square & needle waves, 400 Hz to 5 KC schematic & demo
Slug tuned Shortwave Radio part 4: Reception results on 12 October 2025 during the evening & night

Slug tuned Shortwave Radio part 4: Reception results on 12 October 2025 during the evening & night
Slug Tuned 3-10 MC Shortwave Radio: part 3. Update and practical things of the so called

Slug Tuned 3-10 MC Shortwave Radio: part 3. Update and practical things of the so called "mixing".
Receiving the same Radio Station in a Superhet radio: 1 via TRF and 1 via Superhet reception: how?

Receiving the same Radio Station in a Superhet radio: 1 via TRF and 1 via Superhet reception: how?
Slug tuned SW Superhet radio receiver pt 2: reception results and schematic of the Local Oscillator

Slug tuned SW Superhet radio receiver pt 2: reception results and schematic of the Local Oscillator
Slug tuned SW Superhet radio receiver 3 - 10 MC, part 1. First idea's and experiments (VLOG)

Slug tuned SW Superhet radio receiver 3 - 10 MC, part 1. First idea's and experiments (VLOG)
Exper. SW radio. A new approach, tuning the L.O. and the antenna coil via slug tuning, can it work?

Exper. SW radio. A new approach, tuning the L.O. and the antenna coil via slug tuning, can it work?
Book Capacitor Superheterodyne radio (pure experimental) for SW around 7 MC final results (VLOG)

Book Capacitor Superheterodyne radio (pure experimental) for SW around 7 MC final results (VLOG)
HF antenna amplif. for Shortwave 1-10 MC with a FET BF 256 A and about the book cap superhet project

HF antenna amplif. for Shortwave 1-10 MC with a FET BF 256 A and about the book cap superhet project
Making an IF filter on 460 KC and 10 KC wide bandwidth. Can it work? No, not in this way, though..

Making an IF filter on 460 KC and 10 KC wide bandwidth. Can it work? No, not in this way, though..
Unpacking Ali Goodies (coils and tuning capacitors) and talk about their properties

Unpacking Ali Goodies (coils and tuning capacitors) and talk about their properties
Local Oscillator (def. schematic) for a Superhet. to receive radio stations around 7 MC (41 meter)

Local Oscillator (def. schematic) for a Superhet. to receive radio stations around 7 MC (41 meter)
VLOG & Schematic & demo of a local oscillator in the 7 MC Radio Band ( = 41 meters on Shortwave)

VLOG & Schematic & demo of a local oscillator in the 7 MC Radio Band ( = 41 meters on Shortwave)
Analog Radio tech: test with a Local Oscillator the

Analog Radio tech: test with a Local Oscillator the "book type" tuning capacitor of the 1920s (5MC)
The XX1080 image intensifier tube of the 1980s, some overview and demo and how to make it work

The XX1080 image intensifier tube of the 1980s, some overview and demo and how to make it work
The

The "Book type" Radio tuning capacitor of the 1920s, tested/demo going from 50 pF-110 pF (part 1)
Small talk about a classical 5 transistor 10 Watt HiFi audio amplifier schematic of the 1970s & more

Small talk about a classical 5 transistor 10 Watt HiFi audio amplifier schematic of the 1970s & more