Electronics

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4000 Series Logic ICs: The 4051 8-channel analog multiplexer/demultiplexer IC

Playing around with 4000 series logic ICs, this is the 4051 an 8-channel analog multiplexer/demultiplexer. It takes 3bit binary select input which determines the seledcted input/output and the common input/output is used to input an analog signal or output signals coming from the selectable inputs. Great if you want to expand the analog ability of…

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Bubble Display – HP QDSP 6064

I picked up these tiny bubble seven segment displays from Cool Components – https://www.coolcomponents.co.uk/opto/led-displays/bubble-display-7-segment-4-digit.html They are cute little displays ideally suited to counters, watched or displaying your analog values. They can be really power efficient too, with a 2v drop on the segments I can calculate the resistance needed for around 0.5ma. 3v / 0.0005…

Repairing Old Stuff: Commodore PET 2001 – 8 (1977) – Part 1

I have salvaged this lovely Commodore PET 2001 – 8 (Earliest time code on ICs is 1978 so far) from eternal storage and inevitable decay. I hope to restore the PET to a reliable condition by cleaning the board connectors etc, replacing capacitors where feasible and reseating all of the accessible chips. Some may even…

Atomic Time with the 60kHz MSF Time Signal Receiver

I picked up a 60kHz MSF Time Signal Receiver from PV Electronics after I came across this brilliant library and explaination http://danceswithferrets.org/geekblog/?p=44. This article was all I needed to get started thankfully. The MSF Time Signal is broadcast from NPL in the UK from Anthorn in Cumbria but similar signal are broadcast all over the…