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Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity.

    
Example: Infrared control system
Electronic circuits archive 


Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity.







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Related electronic circuits:

Parallel port dongle (12C508A) By using the PIC 12C508 MCU from Microchip, we can make a cheap and simple hardware protection key (dongle).

Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity.

Smart lock (12C508A). The base sends a data sequency (the password) which is recognized by the key. The key checks the sequency and -if it recognises it -sends to the base another data sequency, as an answer to the password. At the time when the base gets a correct answer (which means that the key has been introduced), the relay is put into action, and it can command a number of consummers.

The Surfer’s Preserver. It is a simple device that prevents other phones in the house from disrupting your critical Internet session by disconnecting them from the line while you surf! It is also useful in preventing eavesdropping from other extensions.

A frequency meter metal detector. We have designed the metal detector, the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). Our device has a simple design and one has the quite good characteristics.

Dynamic lights (12C508A) (Christmas)

DIGITAL NOISE GENERATOR. This circuit produces a repeating sequence of serial data that contains attributes useful for emulating audible noise.

CONTINUITY TESTER. Among the essentials for circuit design and prototyping is the continuity tester, a simple device which provides an audible indication when a sufficiently low resistance is applied between its input probes. This version has a feature which automatically turns off the tester after about two minutes, thereby saving the 9 volt battery from inadvertent discharge.

A frequency meter metal detector. We have designed the metal detector, the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). Our device has a simple design and one has the quite good characteristics.

A virtual measuring instrument for your PC. The virtual frequency meter is program for PC and simple measuring instrument, which is connected to COM to port of the computer. The virtual device allows to measure frequency, period, time frames and score impulses.



ATTENTION! Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity. , as all other schemes are located on the sites of their rightful owners. We are not liable for the contents of other sites as well as the site having a circuit Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity. . Pressing the button you must get onto a page with Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity. .

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