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

quiescent current alignment in (homebrew) audio class B amplifiers

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

Making a very simple oscilloscope Pt 5: HV gen (380 V DC) via the mains & driving Hor-Vert plates

germanium transistors, audio pre amplifier, part 2

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

Physiological sound control: some essentials and demo schematics

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

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

More versatile A stabile Multivibrator made with 2 FETS (schematic) 50 Hz-8 KHz and more

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

The TRF radio for LW and MW working on a long wire antenna: final setup demo and front end schematic

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

Talking about a class B audio amplifier of the 1970's, a failed (?) circuit and a lot to tell/demo

Relaxation or blocking oscillator (HV or whatever): about their strange behaviour (demo & schematic)

Oscilloscope homebrew pt 4: how to make the CRT working. Dem. & Schem. and key information B7S2 tube

Test of the 2 x 30 Watt (now 2 x 10 Watt) audio amplifier on its sound profile update + schematic

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

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

Oscilloscope homebrew pt 3 (to test electronic components) further developments and more: VLOG

Rough test of a discrete 2 x 30 Watt homebrew audio amplifier on thermal runaway + schematic

Making a very simple oscilloscope Pt.15: def. schematics, Hor. Amp & Vert. Amp & time base + wiring

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

Looking inside the Indesit IDL 51 Dishwasher after 12 Years of flawless service

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

Tool to test visible light sensors and IR sensors on their proper working and freqs in the nM range

Oscilloscope homebrew pt 7: about the hor. and vert. amplifier and its HV Voltage, a DC quadrupler

Oscilloscope homebrew pt. 5: first practical use in the 1939 way (frequency comparison, time=50Hz)

ratata audio sound generator (schematic)

When Astable Muvibs don't want to oscillate when the voltage is slowly applied. Why? And what to do?

FET oscillator 2 MHz - 9 MHz with 2 gate FET BF 982

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

Opamp "echo remove" & "phase sound" audio bandpass filter

1 tube AM radio circuit from the 1920's - how to make it

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

Rebuilding/downgrading a High Q Farnell sine wave generator to a simple circuit 100KC-12MC (VLOG 2)

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