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Electronics

Here are some works of mine about Electronics:


Where to buy electronic components, accessories and lab instruments

After several years experimenting with electronics, I gathered a list of on-line shops where I can find electronic components and any other material and service which can be useful for electronics professionals and amateurs, including: PCB manufacturing and mounting, boxes and containers, SMD and PTH soldering tools and consumables, lab measuring instruments.

I published this list on my blog, hoping it could be useful for others and inviting them to share their lists.

The idea had immediate success and I got many contributions from other community members.

Here is the blog entry (in Italian) and the downloadable PDF:
Oscilloscope
An oscilloscope
Dove_comprare_componenti_elettronici_strumenti_attrezzature.pdf
File Size: 230 kb
File Type: pdf
Download File


Some electronics related answers on ElectroYou.it forum

Here are some of my answers to electronics related questions posed on the ElectroYou.it forum (in Italian).

   - How to charge sealed lead acid batteries

   - Hints on NiMH accumulators and on recharging them
   - How to convert a voltage range into another
   - How to condition a photoresistor to get a signal proportional to human's eye sensation
   - 50 to 100 Hz tunable active low-pass filter for sub-woofer
   - Get rid of burglar alarm false triggers caused by voltage noise
   - Automation of sequential and individually timed actions, with just two ICs. Is was needed to automate water filter cleaning for a small lake and had to work exposed to all-seasons temperatures. The applicant built the controller according to my project and it satisfactorily worked.
   - Schematic and kit for automatic incubator egg-turner

   - Remote control for magnetic loop antenna tuning
   - Automatic random-delay fence opener
   - Differential revolution indicator to equalize boat engines regimes
   - Fishing bite alert circuit
   - Long-term timer circuit

   - Synchronize focus and shutter commands for several cameras
   - 3 V micro-UPS circuit for camera
   - Driving two LEDs with a single microcontroller pin
   - Electric control panel heater-on LED indication
   - Energy harvesting and hints
   - Stand-by absorption of home electrical appliances
   - Zero-crossing switching explanation

   - Hints on CE marking
Plot of linearized sensor response between 0 and 1
Electronic scheme of a lake filter automatic cleaning controller
Electronic scheme of an automatic egg turner for incubator
Electronic scheme of a 50 to 100 Hz tunable low-pass filter for sub-woofer (Sallen-Key cell with Butterworth approximation)

Home burglar alarm

This is a microcontroller based home burglar alarm I designed and made in my free time.
It was published in two parts on the "ElettronicaIN" magazine.

The article
expandable preview (on the right) and the download of the PDF and firmware (in Atmel AVR assembly language) are made possible thanks to the kind permission of the magazine's publisher (Futura Group).
Antifurto_casa.pdf
File Size: 781 kb
File Type: pdf
Download File

Firmware.zip
File Size: 44 kb
File Type: zip
Download File

You can also get the articles, after a free registration, from the official "ElettronicaIN" website, looking for article title "Antifurto casa a filo" in year 7 magazines n. 61 and 62.

Sensors evolution and translation of automotive applications

The first article is about industrial sensors evolution towards "smart sensors", integrating auto-calibration, auto-diagnostics, signal filtering & pre-processing through conventional algorithms or neural networks and fuzzy logic.
Picture
The second article is a translation (from English to Italian) of smart sensors automotive applications to improve security and performance and reduce polluting emissions.

Both articles were published on year 1, n. 2 of the "Elettronica Integrata" magazine (publisher: Tecniche Nuove).
Evoluzione_dei_sensori_e_Applicazioni_automobilistiche.pdf
File Size: 3699 kb
File Type: pdf
Download File


Programmable structures in ASICs

Picture
The availability of VLSI Technologies ViaLink-based PROMs inside ASICs allow features like individual trimming, serial number storing and individual cyphering keys.

This article was published on year 1, n. 1 of the "Elettronica Integrata" magazine (publisher: Tecniche Nuove).
Strutture_programmabili_negli_ASIC.pdf
File Size: 1502 kb
File Type: pdf
Download File


Sealed lead acid battery charger

Current- and voltage-controlled sealed lead acid battery charger. It is protected against output shorting and battery polarity inversion.
It has a "charge in progress" LED indication which is on during charge and off when the charge is complete. The LED stays off also in case of incorrect connection.
Electronic scheme and picture of automatic sealed lead acid battery charger
After making, I used it in the maintenance of a telecare network I was technical responsible of.

I proposed this circuit to the reader's projects section of the "Nuova Elettronica" magazine. It was approved and published on the year 26, n. 169-170 fascicle.

The article preview and download are made possible thanks to the kind permission of the magazine's publisher (Centro Ricerche Elettroniche).
Caricabatterie_protetto_con_indicazione_fine_carica.pdf
File Size: 788 kb
File Type: pdf
Download File


Telephone ring repeater

Picture
Interface circuit to turn on a loud siren when ring current is received on a telephone line, but keep quiet when the rotary dial is operated. I made a couple of them for elder relatives of mine, who used these devices for many years.

I proposed this circuit to the reader's projects section of the "Nuova Elettronica" magazine. It was approved and published in the year 23, n. 148-149 fascicle.

The article preview and download are made possible thanks to the kind permission of the magazine's publisher (Centro Ricerche Elettroniche).
Suoneria_telefonica_supplementare.pdf
File Size: 801 kb
File Type: pdf
Download File

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  • Home
  • My résumé / CV
  • Electronics
  • Computer science
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