Pure waves - Wien-bridge oscillator

This system offers low frequency pure sinusoids with distorsion better then 0,1% by a retroactive feedback Wien bridge oscillator...

W analog - How to emulate sensor potenziometer

It's a really totally-linear sensors analog potenziometer. Circuit has two soft-touch plates and one OPAMP...

150 VA DC to AC Converter - A "battle" 12Vdc/220Vac Inverter

How to get a classic power signal (220V) like that used in domestic european power supply, where missing the normal domestic energy power ...

FM (144-145MHz) ham-radio class C power amplifier

Design and realization of a FM 2meters (145Mhz) ham-radio power amplifier. Overview  theorist functionality of RF class C amplifiers and useful empirical councils to make them. Differences among classes (A, B, C,AB)...

Simple toggle switch - How to make a simple toggle switch with one flip-flop

This device, named "toggle" because the core is toggle flip-flop,  can activate and deactivate anything (i.e. other external devices) by simply push on one button switch ...

Approach to GSM Mobile technique - Switching and signalling in mobile phone networks

Principles of GSM network: from HLR Inquire to ISUP for phone switching circuits ...

Telephone switching and Transmission principles

Transmission and Switching techniques in telephone world: PSTN, ISDN, mobile comms. Synthetic description of PCM and PDH/SDH hierarchy; most used line codes: RZ, AMI, HDB3, CMI ...

Traffic Engineering over switching networks 

Theoretical study of traffic telephone course: from statistical Poisson's models to Erlang formulas for dimensioning and grade of services analysis: busy-hour, blocking, offered traffic. Moreover an easy example of design of  small customer care...

Magnetron

From radar to microwave oven: myth of a high power oscillating electronic tube. Magnetron's story and its military and consumer applications...

Parking Sonar - An easy ultrasonic radar/sonar without microprocessors to parking your car in reverse gear

Obstacle distance is notyfied by a led-bar and by a three levels of sound from one buzzer ...

Notes on resonant circuits

Why resonant circuit is made by inductance and capacitor? How happens when inductance and capacitor meet themselvs. What are larsen auto-oscillation and Q factor? Short simply and intuitive-mode discussion about resonant circuits in: serial resonator, parallel resonator (anti-resonator), overshoot, resonance frequency and Q factor ...

POLYPHEMO - POLYvalent PHEnomena MOnitoring - Rough drafts about one citizen videosurvillance project for town of Capua

Internet pills - How to orient itself among LAN, WAN, Ethernet, HUB, Bridge, Router, Switch, TCP/IP, NAT, ipv4 and ipv6, subnet mask terms etc.… (not complete... if you want to give some contributes, please complete missing parts)

Some note on the study of the Inter-working between router in IP world

Small excursus deriving from my studies on interworking in IP nets with the attempt focusing the relative concepts of BGP capabilities and analysis of the route-reflector...  (not complete... if you want to give some contributes, please complete missing parts)