This article shows how to set up a procedure for identification of a DC Motor with permanent magnets aimed at digital torque control. In this applications are used: L298 (see the datasheet) - a dual full-bridge driver designed to accept standard TTL logic levels and drive relays, solenoids, DC and stepping motors and ADM3202/ADM3222/ADM1385 - transceivers ideal for battery-powered portable instruments.
The application is divided into two parts:

The printed circuits boards(PCB) for the production, are realized with a finishing process named H.A.L. (Hot Air Levelling) while the prototypes' realization, usually, with a finishing process named "chemical tin". But which are the differences and especially, considering the prices, the process' quickness and the normative in force that bans the lead employment (RoHS), which is the best to be used and why?

Capacitive Keypad 16 KEYs
Inserted new plan, realized for being placed to edge monitor of a PC and therefore to command 16 access keys. The keyboard is to passing inserted in a buttonhole of the wood of the case of the monitor. Succeeding varies test has been carries out with distance to 1Cm (between finger and keyboard) considering like dielectric the wood interstice.
The KEYs are realized directly on the PCB.

ACCREDITED PHONE DIALER PP.TT.

This is one of the first phone dialers that I have realized. We speak about almost 10 years ago!

EMI/RFI Protection & primary and secondary TELECOM

With the Ac-Safe circuit you can create your customize protection, installing and testing the components that will make your applications immunes from various disturbs.

Receiver for Rolling Code REMOTE CONTROLS and other encoders

IperCODE is a didactic project, with which it is possible to build a remotely controlled acquisition system, based on rolling codes. The accepted remote controls must be of the same frequency of the module RECEIVER inserted into your project. The most common used encoders are Rolling Tails Keeloq, National MM53200 UM3750, Motorola MC145026 MC145027 MC145028.

The tracks width, in the printed circuit realization, must be dimensioned on the strength of the current that runs in that branch. The norm that defines such details is the MIL-STD-274 275 and further reviews, but by now exceeded by IPC2221 and IPC2222. However some quick details could be: