radiofun232

Finding out a 0.5 Watt Class A audio amplifier, how does that work? Experiment, schem. & explanation

TPA3116 Chip tested: 2x50 W audio, USB and Card audio in, LS out, line out, bluetoo & remote control

Two too simple 150 mW class A audio amps with 2 transistors, usable on 3 Volt at 125 mA constant

Charge a NiCad pack of 4 cells to 5 Volt. Basic circuit for AC/DC & about the basics of charging

Precision potentiometer (precise to 1 Millivolt). Schematic with 3 of them used, to do that job

TDA 2615 audio Chip amp 2 x 6 Watt max. from Philips, pure Hi Fi, datasheet & links how to make it

Field Effect Transistor tester for small signal FETS and MOSFETS, via the oscillation principle

The MC 34063 A tested as STEP UP converter DC to DC schematic and demo (low to higher DC voltage)

The MC 34063A (DC to DC up/down) Buck Converter Chip from Texas Instruments tested (schem/demo)

The Astabile Multivibrator can always fool you (happy flickering Christmas lights) schem/demo

Experimental oscillator with the NE 5532 p Chip (300 Hz-9KC) & a square wave to sine wave LF filter

Beginners 1 transistor audio or HF amplifier. The grounded emitter schematic, 2 times showed

The Philips Technical Magazine of the 1950s-1960s: they were far ahead in their technic. revolutions

Frequency divider by 10 or more (schem. & demo with the 7490 TTL Chip + link to analog freq. meter)

You like the Germanium sound? This shows a 1 transistor Germanium pre amplifier & tells more (text)

Copying and mimicking a drawn electronic schematic to a board and make it work

open air coil completely shielded with tin plate, effects on the frequency

How to repair burned out resistors in a AVO (Ampère/Volt/Ohms) meter when you don't know their value

Change a 500 uA meter into a 1 Amp. or even 10 Amp. meter with a shunt, say a piece of copper wire

Browsing a French electronics magazine of 1964 with 11 (!) different Astabile Muvib. schematics

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

shortwave radio VFO oscillator circuit

Rebuilding/downgrading a high Q Farnell sine wave generator to a simpe circuit 100KC - 10MC (VLOG 1)

Easy 2 transistor Wien Bridge Sine wave oscillator 5 Hz - 33 KC schematic & demo and more, read text

Table microphone with audio limiter first experimental results: 741 Opamp & NPN transistors (VLOG)

Changing an electric fly swatter/catcher into a gas light "sparker"? That proved to be not so easy

2 transistor sine wave oscillator with deck switch freq. between 150 Hz and 22 KHz (schematic)

7400 logic chip drives LEDS but is also used as clock generator 2 Hertz (schematic)

Making a very simple oscilloscope Pt. 4: a basic working HV osc. circuit with an output of 250 V DC

mono stabile (one shot) generator with 2 transistors (experimental circuit)

Talking about a soldering pistol of the 1980s: the WELLER Record 100 Watt, how to .. (VLOG)

Making a very simple oscilloscope Part 2: setup and shielding the tube against ext. E.M. influences

Making a very simple oscilloscope Pt. 9: VLOG + schematic showed (without Horiz. & Vertical amps)

Frequency dependent backcoupling & audio filtering (2 transistor demo circuit)

Making a very simple oscilloscope Pt 10: a VLOG & sawtooth generator & schematic update & more

The STPS3045CW Shottky rectifier used as a variable capacitor in a shortwave radio coil oscillator

Audio amp 400 mW specially for bad/weak signal to noise audio files

Two transistor condensor microphone capsule/amplifier explained (~ schematic/practical circuit)

Analog frequency meter 45 Hz-19kHz schematic + demo

Radio Magazine from 1953: the first harddisk, transistors,Hi Fi, filters and old school technology

low cut - high pass active R-C audio filter (schematic)

Making tiny currents and electron flow visible with a Wheatstone bridge demo & schematic

Harvesting wires from old telephone cables, re-use them, about cable capacitance & a SW antenna coil

BBC Radio received on Long Wave at Night at 3.27 hr. Dutch time 29apr2023 via my homebrew LW Radio

Small talk about the Quality factor (the Q) of radio coils, in theory going from 1 Hertz to .....

How to bring a VFO or local Oscillator (LO) e.g. for a SW Radio into the right freq. band (demo)

Long Wave radio reception (say BBC in Europe) via a 2 transistor setup + a wire antenna (schematic)

germanium transistors audio pre amplifiers, part 1

Finally success to make a good quality Long Wave (TRF) radio: demo and schematic

30 sec-3 min (water) pump timer relay (schematic)

Infrared lantern/spotlight 950 nM lighting up in pitch dark how to make it VLOG 1

Audioscope schematic (magnetic deflection circuit, input freq = 50 Hz to 10 KHz)

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