Call for help alarm circuit
Source: InternetPublisher:已注销 Keywords: Alarm circuit oscillator Updated: 2021/01/08
Shown is a simple call for help alarm circuit . The circuit is mainly an audio oscillator composed of NE555 integrated circuit . The power supply of the oscillator is controlled by
the thyristor VT . When the control key Ki is operated , the trigger signal causes the VT to conduct and oscillate . The device is powered to work and drives
the speaker to produce sound to attract the attention of people around you.
Latest Optoelectronic Circuits Circuits
- Fire safety evacuation emergency signs
- LED Signage with RS232 Port Operation Guide
- LED Flasher circuit using 2 transistors for LED switching
- Use MC1455PIG to make automatic cycle light-emitting diode circuit
- Use NE555 to make a lighting and sound changing circuit
- 4-digit incandescent lamp display circuit
- Colorimeter circuit
- Desk lamp dimming soft switch circuit
- Incandescent lamp dimming circuit using thyristor part 4a
- SH-803R holiday lights ASIC
Popular Circuits
- Radio induction alarm circuit
- Fireproof and anti-theft telephone intelligent alarm circuit-voice circuit
- Power outage call alarm circuit
- High voltage alarm circuit
- Pulse beat monitoring sound and light alarm circuit
- Water boiling alarm circuit
- One of the boiling water alarm circuits
- Current transformer secondary open circuit alarm circuit
- DC power supply undervoltage and overvoltage alarm circuit
- One of the power outage alarm circuits
京公网安备 11010802033920号