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8 bit digital code lock intercom system
The document presents a technical paper on an 8-bit digital code lock intercom system, designed for effective intra-building communication. It details the components of the intercom, including a microphone, speaker, amplifier, and a locking circuit driven by dip switches and magnitude comparators. The setup requires a preset 8-bit password to activate the intercom system, which is powered by a step-down transformer.
8 bit digital code lock intercom system
- 1. TECHNICAL PAPER PRESENTATION ON 8 BIT DIGITAL CODE LOCK INTERCOM SYSTEM BY SAGNIK JANA E.C.E, 4th
- 2. ABSTRACT Intercomsystem : It primarily comprises of a microphone, a speaker and an amplifier. The locking circuit provides an 8-bit digital code. As soon as the code matches the intercom system becomes operational. The Intercom system is of a great help for intra building communication.
- 3. OVERVIEW The codelock circuit primarily uses four DIP switches and two magnitude comparators (7485) which drives the relay to the console when code matches The intercom console broadly consists of an audio power amplifier (LM386), a microphone and a speaker. It is important that there is no acoustical
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- 6. OPERATIONAL FLOW CHART Dc power supply The 230 volts ac supply is fed to the step down transformer which provides a 16 volts ac at its output. 8-bit lock code The password is first set using a preset dip switch of 8-bit length & magnitude comparator energizes a relay which switches on the intercom system. Intercom system The blocking capacitors only allows ac component & filters the noise.
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- 9. BIBLIOGRAPHY http://www.alldatasheet.com/datasheet - pdf/pdf/8074/NSC/7485.html http://www. researchcel l.com/general/7809-pin-and-circui t - diagram/.html http://www.engineersgarage.com/elect ronic-components/7805- vol tage- regulator - ic.html http://en.wikipedia.org/wiki/BC548.html http://www.engineersgarage.com/elect ronic-components/ t ransistor-bc547-datasheet.html http://www.datasheetarchive.com/IN-4001-datasheet .html http://www. t i .com/product/lm386.html