Category Archives: Other projects

PCB Vice

After seeing the Stick-vice on you tube I wanted one. At first I thought is was a strange rather useless thing but it turned out to be very handy. You can use it to hold a pcb level under a … Continue reading

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Semi automatic transformer winder

I had made one before but the problem was the feed of the wire. It was a lot of work to do that by hand. But I had some more things I wanted to change. The “feeder” is moved by … Continue reading

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Nicd charger for portable dust-sucker

We have a “Kruimeldief”, a battery-powered vacuum cleaner. It was previously unusable because the batteries would no longer feed it. The original adapter was a 15V AC adapter and in the kruimeldief there was a diode. It has a battery pack … Continue reading

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Genetically mutated 3rd hand for soldering

Working on my 3D printer gave me the idea to make this over the top 3rd hand solder and repair “thing” The aluminum profiles in my junk box begged me to use them for something. They are the bigger brother … Continue reading

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Where did I leave that probe ?

If you have like me, a nice collection of multi-meters, you probably also have a lot of probes. I like testleads that have bananaplugs instead of permanent probes. This way I can use them with probes, crocodile clips etc. I … Continue reading

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emergency switches

I use an isolation transformer and a variac combined with a light-bulb when I repair mains powered instruments. But that is not close enough if things go wrong. You know, the kinda problems that communicate with smoke…. This cabinet houses also … Continue reading

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Lead-acid battery charger and conditioner

This is an adapter that makes a 24/7 battery charger from a normal 14V power-supply. The original design is published in Funk-amateur, a German magazine. That is a very clever design and very simple, some leds, resistors and 2 relais. I … Continue reading

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Multifunction oven

  It uses two resistive heaters in serie. The temp is controlled by a PID controller. On top you see a fan. This cools the oven if needed so I can cool it faster. It scuckes cool air in through … Continue reading

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Helping hand

I mounted a few banana plugs to a pair of Peiker microphone “goose necks”  This way I can mount crock clips to them. They are mounted to a aluminum L-profile. They  are very precise and stable. It is very easy … Continue reading

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Solder fume filter

Smoking solder is not a very healthy addiction 🙂  The fumes contain stuff that is not good for your health. Especially the solder that contains lead.  How bad it is, I have no clue. I read that lead in solder … Continue reading

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Inductor winding

For rewinding transformers or coils I made this thing from junkbox parts. The open wheel and brake is from an old sewing machine . The aluminum from an old grinding machine. The other parts are spares from my Unimat mill. … Continue reading

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Tips

Here you see the tip of a screwdriver with 2  pieces of silicone tubing holding a screw. This is an easy way to get screws in places there is not enough space for your hands. Many portable instruments are hard … Continue reading

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DIY universal PCB holder

While probing a circuit it is handy if you can stabilize it so it does not dragged over the table edge by the weight of probes and other wire connections. There are a lot of solutions for sale but I … Continue reading

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Pace tweezer DIY tips

I have a Pace MBT-250 including the tweezers but without tips. These tips are very expensive. Today I needed to remove a smd IC from a Fluke 725 process calibrator. It was exposed to 230Vac on the 30VDC input. Some … Continue reading

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Small amplifier for laptop

  This is a 2x10W amplifier made from a kit we sold at the ham-fest in rosmalen this year. I wanted a small amp for my laptop and this little amp was ideal for my use. It had to be … Continue reading

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Programming an Arduino using ISP

I use now and then a microcontroller. Because it is easy and there is a lot of info I use an Arduino. But as easy it is to use, as hard is it to use only the Atmel after programming … Continue reading

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Waterlevel pomp switch

Our house has a cellar and there is some strange water resevoir in there. No clue what its use is but if groundwater goes up (I live nearby a big river) this resevoir fills with water and when full, it … Continue reading

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Breadboard plus

The problem of a breadboard is that they are light so if you have some coax , psu lines and probes connected I most times end up witth the breadboard dropping from the table and hanging to some cables. I … Continue reading

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very low budget hot air rework tool

I wanted a hotair station for   big things like RF shielding. So I went to the garage, took a piece of sheetmetal, my bodywork tools and fired up my smallest autogene welder. The result is the thing above this … Continue reading

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Other boost converters (555 and NCP3063)

    This circuit is a often used circuit for nixie tubes. I wondered how it held up to this one: http://www.pa4tim.nl/?p=4364 This schematic is easy to build, no problem getting it to work but the Voltage regulation sucks. It changes … Continue reading

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Simple 12-24V (or more) boost converter

  I needed a 12 to 24V boost converter. Most times I use a special smps driver/controller. Once used a 555 but  I was in an experimental mood. I found several schematics that all seems to be just copies from … Continue reading

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Audio dummyload

While restoring a Fender twinreverb I needed something to use instead of speakers. The amplifier is capable of delivering 135W into 4 Ohm. But it is no problem to use a load with more resistance . I was in doubt between … Continue reading

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Electuur EPS 4531 voeding

Deze voeding is uit de Electuur halfgeleidergids uit 1974. Deze voeding kreeg ik van iemand voor het kastje. De meters lagen er los in te bengelen, een paar vergeelde knopjes en verder onbekend. Binnen in bleek een netjes opgebouwde Electuur … Continue reading

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Noodstroom ideetjes

Wat ideetjes om te detecteren dat de stroom is uitgevallen. Zodat je weet dat je wekker mogelijk de volgende morgen niet meer klopt, of natuurlijk belangrijker, de ovens van volt en tijdstandaards staan af te koelen. Het zijn geen gebouwde … Continue reading

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Audioversterker-experimenteer voeding

Dit is een Audiotrap met tegenkoppeling op basis van een triode/pentode ECL86. De voeding is wat overbemeten en voorzien van twee bussen waar 250V op staat en 2 bussen waar 6,3V gloeispanning op staat. Op advies van Fritjof Sterrenburg heb … Continue reading

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Webcam als vergrootglas

Dit was een gesneuvelde logitech webcam. Ik heb het ding in een kunstof huisje gebouwd. Deze was motorisch te zoomen. Door nu de lens met de hand in en uit te schroeven kan ik tot op een paar cm scherpstellen. … Continue reading

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PCB maken mbv een plotter

Heel af en toe zou ik wel eens printjes willen kunnen maken. Ik heb echter geen laserprinter en via belichten vind ik te bewerkelijk. Via de Maxwell stichting liep ik voor twee tientjes tegen een HP penplotter, de HP7475A aan. … Continue reading

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Desoldeerpomp upgrade

Omdat ik altijd ruzie had met mijn desoldeerpompje heb ik dat maar eens aangepakt.  Je moet het met een hand op zijn plaats houden, met de andere solderen en als je de knop indrukt springt het ding net weg. Ik … Continue reading

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Arduino experiment

Dit is een klein programma wat de spanningsval over een diode meet en de stroom aan geeft die er doorloopt. Zeg maar heel veel werk om een LED of diode te testen. Maar leuk als programmeer oefening. Hij zegt of … Continue reading

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Een nixie klok dead bug style

Zendamateurs bouwen vaak op de dode torren manier. Ik wilde eens een nixieklok bouwen en dan leek het me leuk om dat ook op die manier te doen. Dus geen gaatjesprint of geëtst printplaatje nodig. De omschrijving van lucky luke … Continue reading

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Kwikdamp gelijkrichter

Een kwikdamp gelijkrichter is de voorloper van de moderne diode. Er ligt een plasje kwik in en dat verdampt door de hitte van de gloeidraad. De paarsig brandende werkt op 200V en er loopt 80mA. De blauwgroene is een acculader … Continue reading

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“Numitron” klokje

Dit klokje is gemaakt met de software van de site van Jon Stanley, waar ook de software staat.http://www.electronixandmore.com/projec … index.html Ik had een stel 3015F incandescent display’s gehad. Een soort mix tussen led en nixie. Ze werken op 5 volt … Continue reading

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Timer

Omdat je de tijd verliest tijdens het bouwen en dan vooral bij smd nog al eens verkrampt zit te werken is het een goed idee om af en toe te pauzeren. Omdat ik daar ook last van heb heb ik … Continue reading

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