• Tech Ads

Strippenstrolch – Elektronikbasteln

“Strippenstrolch” is thus a pitch name for “electricians”. here you can also see a innovative project that combines rainwater harvesting and a solar energy operated pump to flush toilets.

Strippenstrolch – Elektronikbasteln

LED Lighting Projects, Learn Electronics, Basic Circuits and how they work. All in German.

“In Germany one finds this designation now and then for an electrician on the work. Particularly in the winter, if it is still dark in the morning, one often sees “Strippenstrolche” with its building lamp on the building site:”

Strippenstrolch - Elektronikbasteln

Combination of Rain and Sun Harvesting

“The inspiration for a self-sufficient toilet flush was now close at hand: I thought at first to work with a power supply that provides me the 12V to the pump. But as a power supply would idle constantly consume energy, I rejected this solution. I have long experimented with solar power, so I decided, now a solar system for our toilets to build. On the flat roof of our garage I installed two 12V – 55Wp – solar – modules (Conrad Electronics). This I switched in parallel.”

“As a solar storage currently serves an ordinary car battery 45Ah (later 3 pieces with a total of 135 Ah). The charging control acquires an 8A charge controller (Conrad). So all very simple.”

Electrician Tool – Continuity Tester

I had gone to buy some long wires at a electrician shop, when a terminal box had to be tested, he used a continuity tester.

When i used to buy electrical parts in the past, they used a tester box, made of wood. This had a bulb and a tubelight starter and two long wires (230v AC). The Continuity tester would light up a 40w lamp. Now he had a LED based one, so i got one for myself.

Electrician Tool - Continuity Tester

All it had, was two small cells in a plastic box with a LED, i was just flashing the LED as it looked nice thru the transparent box, it failed. The LED had burnt, the battery used. This product was not for monkeying around.

Now i performed a tiny design upgrade, I used a extra-bright 3mm Red LED with a 47 ohm resistor. Now it is robust, at least for continuity. The battery life can be good only if you make quick checks.

Improvements –

More protection may be needed to avoid damage to LED when this tester is applied across a battery by mistake. LED can flash to save battery power, one SMD – LM339 can be used for flashing and a more efficient short-leakage detector. A small oscillator with a neon may be more efficient and bright. This can also double up as a hidden Live wire or Mains AC detector.

Continuity Tester Circuit

A single chip metal detector with a range of a few inches. This is useful for detecting nails or screws in walls and floors, or for locating buried mains cable.

Continuity Tester

This article describes a simple continuity tester, based on an ATtiny85 and a piezo buzzer, designed for checking circuit wiring, or tracing out the tracks on a PCB:

Tesla Coils from Terry Blake

Nikola Tesla invented the Tesla Coil in the late 1800s. Here you will find some information and technologies related to that. HV is not safe and this is not a Hobby for Youngsters. Read to understand the dangers of High Voltage and Marvel at the phenomena.

Tesla Coils from Terry Blake

Multi-Mini Capacitors

The pulse-energy nature of the Tesla coil has long been a tough environment for the discharge capacitor. Coilers have built capacitors with glass bottles and salt-water, sheets of glass and aluminum foil, and more recently, polyethylene sheets, aluminum flashing, and mineral oil

Magnifier Tesla Coil

In a Classic Tesla coil, the magnetic coupling between L1 and L2 is around 20% (0.2).  Tesla realized this caused a lot of loss, and he abandoned the design in favor of a 3 coil system with a very high coupling (60%).

Tesla Coils from Terry Blake

D.C. Cox’s Cheesehead Teslathon, Ed Wingate’s RATCB Teslathon, The Geek Group’s Halloween Teslathon and many more.

Halogen bulb lamp dimmer circuit

Can someone provide me a (simple) schematic for a dimmer that would control 12 VAC about 80 watts. This would be used to control a lamp with halogen bulbs.

Anonymous asked on a comment few years back – Circuits FAQ

Here is a listing study them and choose, try out, learn and then build the one right for you.


This is a phase angle control of a Triac which is a evolution from an SCR. The 50 Hz or 60 Hz Sine wave of mains can be turned on at any point after the Zero Crossing

Triac based Lamp Dimmer power control

The Voltage ramps up in the sine wave which gives a near “Linear” slope which can be used to trigger the ON at a time delay after zero crossing when the voltage is zero. This is like a PWM but works on low frequency only. Some of the early SMPS(HV for TV and Mains Inverter) by Siemens were built around SCRs. Turning off a SCR is a difficult job for a designer, MOSFETS and IGBT are now used for PWM drive stages.

You can use it with a bulb to vary brightness of bulb, this is a live circuit it can give a shock, enclose in plastic box, the pot should have a plastic knob, use a fuse, you can also use it for temperature control of soldering irons.

The Source file in CadSoft EAGLE format is here del00004.zip