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Posts tagged Bell

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 […]

Battery Charger Current Indicator circuit

Battery Charger Current Indicator circuit using LM393

power supply Circuit diagram

+15V -15V power supply Circuit diagram with ic 78xx and 79xx, 7815, 7915, BC549

no picture and audio on my TV?

Bernardo B asked: there is no picture and audio on my TV when i turn-on my TV, but there’s a sound thuk from the speaker when i plug-in the supply cord. i tried to open the back of the TV to check if the fuse is ok and it seems to be good. i trace […]

Whether the purpose of transmitting TV Make?

Whether the purpose of transmitting TV Make? Different course different, the most important is to effectively cables, usually emitted in the room to receive room without cables. Afiata.com trying to invite you to learn with a TV transmitter uses FM modulation to 1 standard for voice and PAL video modulation. Audio signal to be modulated […]

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