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

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

TEST of a Chinese DC to DC converter, say 24 V input, type number Zk J5 X V2 (no good results)

Change a square wave into sine wave on very low frequencies -proof of principle circuit-

AD 9851 variable frequency oscillator 1 Hertz stabile (software driven)

Germanium 1 transistor audio pre amplifier (the basics to get it working properly: demo & schematic)

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

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

Very sharp audio bandwidth filter with a 741 Opamp, demo & schematic and more ideas to develop it

Rebuilding/downgrading a high Q Farnell Sine wave oscillator VLOG 3: FET oscill (130KC-12MC) schema.

2 -10 MHz Shortwave radio receiver (book)

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