Oscillating output improves system security


Posted on May 21, 2012

Many electronic-control systems have digital outputs that use transistors. One method of improving the security in these outputs is to use an oscillating signal to represent a logic-high state instead of a fixed voltage level (Figure 1). This type of signal, a dynamic variable, can drive the circuit shown in Figure 2. This circuit connects to the output transistor of the electronic-control system. The dynamic- variable signal connects to the output transistor, whose collector connects to a pulse transformer.


Oscillating output improves system security
Click here to download the full size of the above Circuit.




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