Archive for the ‘computers’ Category:

2024-04-20 RCWL-0516 Microwave Doppler Motion Sensor Module Schematic KO4BB

The modules use both the RCWL-9616 and the BISS-0001 but it seems the schematics are all labeled BISS-0001.  The parts values are different.  He gives some good information about them.  They operate at 3.5 and 3.98 GHz – the ones I have were advertised at 5 GHz.  Also he shows his own version that uses a

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2024-04-19 You’ve Got Mail

Orchestra plays Windows prompts

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2024-03-31 LoRa Modules From Reyax

Supposed to have 10 to 14 km range.  But probably at very low data rates.

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2024-03-30 MX20T Link Switch Port Tester

A long time ago when we were going to Cat5 UTP, I had a lot of these MX20Ts left over.  So I made up a 15 pin plug with the negative 9VDC on pin 6 and positive on pin 13, and soldered the wires to the battery contacts.  I taped the battery to the back

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2024-03-18  2104 DRAM Memory Delidded, Under Microscope

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2024-03-15 Ferranti Argus “Hearing Aid” Computer

In the “Original Series” chapter this very interesting Wikipedia article talks about the “hearing aid computer” that used the OC-71 germanium transistors which were used in hearing aids and could go only up to 25kHz clock rate. That was quite slow – tube computers could clock at 500kHz.  Later models used faster transistors and could

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2024-02-21 Website for Electronics – Very Comprehensive

This very comprehensive electronics website has many projects with useful devices.  This example project is a transistor curve tracer.  Go to the index and look at the many, many links.  It seems to be at the ETH in Switzerland but some of the words are in ?Thai?

2024-02-08 Padauk PMS154C  5 Cent Microcontroller

“”The 5 cent microcontroller! Got myself 100 Padauk PMS154C, one time programmable microcontroller. 2K program memory, 128 bytes of RAM, 6 timers (some 8 & 11 bit pwm capable), hardware comparator, deep sleep and interrupts capable. Alongside the proprietary programmer too (about 100$). Perfect to flash a few leds on toys, or similar simple cheap

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2024-02-05 1960s IT Guy Predicts The Future

He got almost all of it right.  But at that time  no one knew how portable they would become.  No one knew how many more things they would be and do – telephone, camera, audio and video recorders, run hundreds of applications such as the browsers that access the Worldwide Web.   Email, messaging, clock, calendar

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2024-01-29 Tony Seba’s Prediction Is Sooner Than He Predicted: EV Battery Prices Down To Half

Sam the Electric Viking tells us in this 9 min. YouTube video. Tony Seba (RethinkX) predicted EV battery prices would fall 50% by 2027. It now looks like it may happen this year. Last year they reduced prices by 30%. This is important because 35 to 40% of the cost of the EV is the

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