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Electronics Schematic Diagram alarm Door Bell circuit using IC UM 66 part 1

This is a slight modification of that circuit. In the previous circuit you have to keep the switch pressed for making the IC play the full music. Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music till it ends. The time for […]

Electronics Schematic Diagram alarm Door Bell circuit using NE555 part 1

Electronics Schematic Diagram alarm Door Bell circuit using NE555 The main part of this doorbell circuit are two NE555 timer ICs.When some one presses switch S1 momentarily ,the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is triggered […]

Higher brightness variable circuit

Higher brightness variable circuit using LM334Z, BC558

Audio test oscillator circuit

Audio test oscillator circuit using CD4584, 74c14

Circuit diagram DTMF Decoder using HT9032A MT88L70 HT9202H

Circuit diagram DTMF Decoder using HT9032A MT88L70 HT9202H This exciting project and something that many have been developed, but always remains to add some improvements. The DTMF decoder circuit for distinguishing some separate external components to produce devices capable of sending binary code from a button on the multi-tone phone. This circuit, in addition to […]

7805 schema

7805 schema 7805 schema for 5v using IC 7805 MA 7805 7805 schema 7805 schema

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