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Vacuum tubes are awkward, need always 6.3V filament and high supply voltage? No, they can also work on 3.3V. I have built a vacuum tube pre-amplifier that runs entirely on 3.3V, inclusive the filament voltage. Apparently, the electron emission of the filament still works at 3.3V. Despite the very low supply voltage, the tube amplifier still works well.

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30x10mm ATtiny3217 Arduino breakout board in DIL24

I am looking for someone who can take over the production and sales for a small one-time fee. I will place a link to your shop here too.

The Dily3217 is an Arduino compatible development board of 30x10mm, easy to integrate since it has a breadboard-friendly narrow DIL24 package. It is powered by the new ATtiny3217 and it has 21 I/O lines. It can be programmed with an external USB FTDI adapter. It has more or less the same functionality as the Arduino Uno.

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My name is Albert van Dalen and I'm an inventor. I have 40 years of experience in electronics and software. During the development of the Maxun One solar bike, I constantly needed special equipment, parts and software, and so I rolled from one project to another. In September 2010, I started this website where I share my ideas and designs with the world. On my webshop, I sell products that I initially made for myself, but that were also interesting for others, such as a spot-welder controller and a solder-paste dispenser.

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DIY simple manual SMD solder paste micro-dot syringe dispenser

With this tool you can precisely dispense very small dots of solder paste. Although this solder paste dispenser is cheap and uncomplicated, it works better for small SMD parts than many automatic dispensers.

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This advanced controller is used by many people and has a unique reduced inrush current circuit that prevents main fuse blow up.

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I have developed the D.I.Y spot welder because I needed a special spot welder for the building of my Maxun One solar bike. It turned out that the spot welder is being built by many people worldwide, so I have published here the entire building project.

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This Arduino board can be used for any project where something needs to be controlled and that is menu-driven.

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The SAM 15x15 is a very small Arduino development board, with the same powerful controller as the Arduino Zero: the SAMD21G18.
All I/O pins are used: despite the small size, it has more I/O pins than the Arduino Zero or SAMD21 Mini/Dev Breakout: 34 instead of 21. Due to the very small dimensions it will fit easily into all embedded electronic projects, even in microdrones.

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Switches and push buttons need debouncing. It is straightforward to do this with software, using a library. The advantages of the Switch library are:

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For programming and testing, I don’t use physical connectors on the PCB but connectorless self-clamping zigzag connectors. The pin header of the programming tool is inserted directly into the holes. By the zigzag positions of the PCB holes, the connector pins press against the holes and make electrical contact. The connection is reliable, I have never experienced any contact problems.

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To be able to modify and repair the Chinese S-KU63 e-bike motor controller I have redesigned it. The S-KU63 may also give insight into other Chinese motor controllers. Note that the S-KU63 is the successor of the KU63.

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Bosch Active Line 3 printed circuit board explained

For my solar powered bicycle, the Maxun One, I designed a very powerful and lightweight mid-drive motor. I also wanted to investigate whether I could use a Bosch Active Line 3 motor. The Bosch motor weight is 2975g, this is relatively lightweight for a mid-drive motor, but it is still too heavy for my solar bike.

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I have developed a cheap multimeter calibration reference by which you can calibrate a digital multimeter yourself. Here we calibrate my favorite multimeter, the PeakTech 2010, it has a lot of features and it cost just €35.

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These are my inventions up to now, see also the inventions in the pipeline. If you are interested, please contact Business Partners.

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I have inventoried my on-going projects, because I honestly speaking lost the overview. I had started many projects but many of them are on-hold because they, on closer inspection, cost years to finish and in the meantime other things had become more important and I keep getting interesting new ideas.

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