Category Archives: general electronics

1mm and 1.25mm pitch connectors

Some photos to help identify connectors. These ones are JST SH which are 1mm pitch wire-to-board shown here, with surface mount connectors: These ones are Molex PicoBlade, which are 1.25mm pitch with wire-to-board (through-hole) and wire-to-wire examples shown here:

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Ultra portable pocket PSU

Although a bench PSU is useful, sometimes I prefer testing with something more portable. This ultra portable PSU has a footprint smaller than a credit card. It is perfect for travel. (Pen shown in image below for scale). I can … Continue reading

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7 segment Alphabet

A surprisingly large amount of the ASCII table can be represented with a 7-segment display. The image here shows what can be created. Here is the source code of the table used to create this. #define SEGA 0x01 #define SEGB … Continue reading

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Crimp pins, sockets and housings

Like it or not, the 0.1 inch spaced (2.54mm) header pins or sockets on PCBs are extremely common. There are also 2mm spaced alternatives, but they are still uncommon. Making up 0.1 inch connectors is a minefield; it can be … Continue reading

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fpga4fun – any good?

I personally feel a beginner is better advised to purchase a more open platform like Papilio One. The fpga4fun boards are closed, and some of the boards only have a block diagram; some of their examples are not supplied with … Continue reading

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Component Storage

SMD devices like resistors and capacitors can be stored in tiny plastic boxes such as shown here. Make sure the label is written in fade-proof ink and that the labels won’t fall off within a year. I used tiny EPROM … Continue reading

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SMD soldering

This is a quick tutorial on how to solder an SMD board with 0603 and QFP sized components. This was the finished board: ‘0603’-sized components are fairly tiny; 1.6mm x 0.8mm. The image here shows some 0603 capacitors and the … Continue reading

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Surface Mount Soldering – Tools

This set of tools is (in my opinion) some great tools for SMT soldering without going the reflow route (which requires an oven).This shopping list costs approx. £180+VAT and is complete. Tools required A temperature controlled soldering iron (approx 50W), … Continue reading

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Another Test Probe

This one used an SMA plug, so it is a bit more versatile. The SMA plug was from Maplin. The 1.02mm tips from Pomona fitted quite nicely into the center pin of the SMA plug as shown here, and it … Continue reading

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Test probe

This test probe is based on an SMA connector and spare test probe parts: Side view: Parts used: Pomona test tips: Kit model 6354 (Five different sizes, pack of 10 total) SMA socket: Tyco 3-1478955-0 PTFE tape (plumbing tape) Epoxy … Continue reading

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