Welcome to my site “Elektronica Stynus”, on this site you can find some information about me and my electronic diy projects that I have made or that I am currently working on.

Why “Elektronica Stynus” as site name? This site started in Dutch. Later on this English version was added. I didn’t want to change the name to “Electronics Stynus” so I used the same name for both site’s.

Illuminated house number + doorbell push-button

When I bought my house there was a wireless push-button for the doorbell, this was mounted on top of an old door intercom system. Because the plate is metal, it acted as a shield making the wireless door bell not work very well. Next to this was an plastic house number that was cracked all …

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70V 3A Lab Power Supply Upgrade

A few years ago I bought a second-hand Systron Donner HR 70-3AI power supply. This power supply works with a pre-regulation by “dimming” the transformer to limit the power dissipation. This works ok, but the psu has a rather big output capacitor (3300µF), which makes it unsuitable for testing circuits. After a few months the …

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