Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai
This circuit turn-off an amplifier or any other device when a low level audio fed to its input is absent for 15 minutes at least. Pushing PI the device is the switched-on feeding any appliance connected to SKI. Input audio signal is boosted and squared by IC2 A & B and monitored by LED D4. when...
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| Format: | Student Project |
| Language: | English |
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2003
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| Online Access: | https://ir.uitm.edu.my/id/eprint/50594/1/50594.PDF https://ir.uitm.edu.my/id/eprint/50594/ |
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my.uitm.ir.505942021-09-20T02:56:03Z https://ir.uitm.edu.my/id/eprint/50594/ Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai Zaidin, Mohd Hanafi Arbai, Azrel Assuad TK Electrical engineering. Electronics. Nuclear engineering Electronics Apparatus and materials Semiconductors Detectors. Sensors. Sensor networks Applications of electronics Information display systems Photoelectronic devices (General) This circuit turn-off an amplifier or any other device when a low level audio fed to its input is absent for 15 minutes at least. Pushing PI the device is the switched-on feeding any appliance connected to SKI. Input audio signal is boosted and squared by IC2 A & B and monitored by LED D4. when D4 illuminates, albeit for very short peak, IC3 is reset and the restarts its counting. Pin 2 of IC3 remains at the low state, the to transistor are on and the relay operates. When, after the 15 minutes delay, no signal appeared at the input, IC3 end its counting and pin 2 goes high. Q1 & Q2 stop conducting and the relay switches-off. The device is thus completely off as also are the appliances connected to SKI, C5 & R9 reset IC3 at the power on. P2 allows switch-off at any moment. 2003-03 Student Project NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/50594/1/50594.PDF ID50594 Zaidin, Mohd Hanafi and Arbai, Azrel Assuad (2003) Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai. [Student Project] (Unpublished) |
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Universiti Teknologi Mara |
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Tun Abdul Razak Library |
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Malaysia |
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| language |
English |
| topic |
TK Electrical engineering. Electronics. Nuclear engineering Electronics Apparatus and materials Semiconductors Detectors. Sensors. Sensor networks Applications of electronics Information display systems Photoelectronic devices (General) |
| spellingShingle |
TK Electrical engineering. Electronics. Nuclear engineering Electronics Apparatus and materials Semiconductors Detectors. Sensors. Sensor networks Applications of electronics Information display systems Photoelectronic devices (General) Zaidin, Mohd Hanafi Arbai, Azrel Assuad Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai |
| description |
This circuit turn-off an amplifier or any other device when a low level audio fed to its input is absent for 15 minutes at least.
Pushing PI the device is the switched-on feeding any appliance connected to SKI. Input audio signal is boosted and squared by IC2 A & B and monitored by LED D4. when D4 illuminates, albeit for very short peak, IC3 is reset and the restarts its counting. Pin 2 of IC3 remains at the low state, the to transistor are on and the relay operates. When, after the 15 minutes delay, no signal appeared at the input, IC3 end its counting and pin 2 goes high. Q1 & Q2 stop conducting and the relay switches-off. The device is thus completely off as also are the appliances connected to SKI, C5 & R9 reset IC3 at the power on. P2 allows switch-off at any moment. |
| format |
Student Project |
| author |
Zaidin, Mohd Hanafi Arbai, Azrel Assuad |
| author_facet |
Zaidin, Mohd Hanafi Arbai, Azrel Assuad |
| author_sort |
Zaidin, Mohd Hanafi |
| title |
Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai |
| title_short |
Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai |
| title_full |
Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai |
| title_fullStr |
Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai |
| title_full_unstemmed |
Amplifier timer / Mohd Hanafi Zaidin and Azrel Assuad Arbai |
| title_sort |
amplifier timer / mohd hanafi zaidin and azrel assuad arbai |
| publishDate |
2003 |
| url |
https://ir.uitm.edu.my/id/eprint/50594/1/50594.PDF https://ir.uitm.edu.my/id/eprint/50594/ |
| _version_ |
1712288399653601280 |
| score |
13.211869 |