Current regulator schematic made with 2 HV NPN transistors MJ18004, shortcut prot via halogen lamps

Contact resistances in a switch, that was told to be made for 230 V AC at 15 Ampère, bought via Ali

VLOG 2 first experiments in making a 50 V-1.5 Amp MOSFET shortcut protected variable voltage supply

VLOG 1 first experiments in making a 55 Volt 1.5 Amp variable voltage supply experim. with MOSFETS

Analog timer 3 stage Darlington to switch a 24 V solar inverter off after 1 to 1.5 hour (schematic)

Solar panel 48 Volt 4-6 Ampère MOSFET (SSH6N80) lead acid battery charger, schematic and more info

About the properties of a charger to serve a 24 Volt lead acid battery in a solar energy system VLOG

No need to invest 4000 to 6000 Euros/Dollars into a "home battery", system. Keep it simple (VLOG)

Harddisk opened to see what is inside (demo). Head for read & write bits via magnetostriction

My garden on 31 May 2025 in the Netherlands: about black lice and EU ideas and regulations (textbox)

5 Watt Audio Amplifier made with MOSFETS: audio demo & schematic & some key information about audio

8 Watt Audio amp made with P & N MOSFETS, talking about biasing and more (only VLOG, no schematic)

Simple construction technique for electronics hobby: the brass nail method on well varnished plywood

Double power supply 2 x 18 Volt at 500 mA with very low hum, useful for audio amps (demo schematic)

Shortcut protection for series regulator power supplies (e.g with 3055 or 2955) via automotive lamps

How to make a double power supply for audio amplifiers, a VLOG with idea's & good practice & tips

How to change a 50-500 Micro ampère meter into a 1 or 5 Ampère meter, via a shunt demo and schematic

2 Watt audio amplifier, class B, made with the LM 49600, does it also have 0.0003 % distortion?

The LME 49600: a HiFi Audio Opamp for 0,5 Watt output with 0,0003 % distortion, schematic and demo

Testing the LM3914 Chip (dot or bargraph LED driver for 10 LEDS, 10 x comparator), schem. and demo

10 Watt classical Audio amplifier made with the TL 071 CP Opamp, working now on 20 Volt demo/schem

Commodore PC 1 monitor (not graphics) model type 1402 from 1986 repaired and more (schematic)

Old DOS computers of the 1980s and more, part 2, writing a program for random syllabes or genes?

Old DOS computers of the 1980s and their games and programs, part 1 (demo and more)

10 Watt Audio Amplifier, developed with the 741 Chip, sound demonstration and schematic

How I developed (= how to make) a classical 15 Watt audio amplifier with a 741 Opamp, part 2

How I developed (= how to make) a classic 15 Watt audio amplifier with a 741 Opamp, part 1

Something about the "double cone" loudspeaker, it worked for say 30 years & more info about it

The Viddeleer tone control 1945-1955 made with 2 inductors: revisited and transistorized schem/demo

Can a solution of dried tobacco leaves in water fight lice and spint in the garden? I dont know...

Food dryer used in the spring for drying Sellery and Parsley leaves. Spint insects were a problem

Do not throw away old solar panels, they can last for 30 or more years (demo & more, in description)

No garlic cloves this year (2025) but perhaps I can make garlic powder via the food dryer (demo)

Make a bicycle headlight with 3 white LEDS, suitable to work with a 6 V AC dynamo

Radio reception in the Very Low Frequenc band, say 1 KC - 500 KC via a converter TBA 120 to e.g 8 MC

Anti Hum filter with 2 electrolytics and resistor: useful for sensitive audio or radio circuits, but

Two BLUE LED's with different properties, connected to the same voltage source, how to do that?

My garden on 16 April 2025: information about it and more (a very dry March in Netherlands, 2025)

Repairing a bicycle dynamo made for 6 V - 3 Watt, testing it with Red and Blue LED's and more (demo)

Monostabile Muvib (Latch circuit) with 4 transistors drives a 12 V relay via 1 touch (schem/demo)

Repairing a Chinese "wind up" lantern by replacing its Li ion battery of say 3.7 Volt (how it works)

Acoustic switch made with an audio pre-amp and a 2 transistor time delay unit (demo and schematic)

Simple transistor tester for NPN and PNP Bipolar Junction transistor types: demo and schematic

The young electrician: Dutch book of the 1950s

Thumb trough "der Praktische Funkamateur" (the practical radio amateur), issued in 1964 in the DDR

Thumb through an old Radio book of 1988 from the DDR, the German Democratic Republic & more

Thumb through an old Dutch radio book of 1951, info + showing car radio receivers made with tubes

Simple inductance meter for 1 Henry to 60 Henry schematic & demo for laminated steel coils 50 & 60Hz

Inductance measurement 1- 56 Henry in this case on 50 Hz with steel laminated coils demo & schematic

Making a fierce 940 NanoMeter lamp (dark light, visible to digital cameras), demo and more (elabor.)

Making a fierce 940 nanoMeter lamp/lantern: how to ? & the issues to be expected (not failed exper.)

The tiny neon tube: a good help in electronics and doing tests (demo)

How a 741 Chip can compare two different voltages, switching "on" and "off" made visible via 2 LEDS

Change a uA Meter into an Amp meter. More talks about some fundamentals of a linear power supply

Change a Micro Ampere meter (say 50 or 100 uA) into a 1-10 Amp meter and calibrate it (demo & VLOG)

First & new idea to make a circuit that can measure high inductance coils, more in the description

Easy to make cable stripper to harvest wires out of shielded computer cables and other cables (demo)

No electronics, but preparing a German Schnitzel: an idea because spring is coming (Netherlands)

Peltier Element: My first experiments & ideas, using it for cooling or as an electric source (demo)

Talking about 1 transistor oscillators, working between say 300 KC and 1.6 MC (demo & schematics)