Touch alarm circuit (1)
Source: InternetPublisher:拿铁三分糖 Keywords: Alarm circuit touch type relay transistor Updated: 2020/03/19
Circuit working principle: Transistors VT1 and VT2 form a complementary positive feedback amplifier
. Normally, both VT1 and VT2 are in cut-off state, and relay K does not act. When someone
touches the electrode sheet M, the human body leakage current is output through the high-value resistor R1 and directly sent to
the base of VT1 for amplification. Therefore, VT2 has a strong emitter current flowing through the relay
K, causing K to be electrically closed. , its normally open contact is closed, and the alarm light or bell is turned on.
- How to use MFRC522 to create an RFID card reader security system
- Ways to deliver more than 100A to ADAS processors
- What components and functions does the battery management system consist of?
- Mono LB1405 level indication circuit
- Four water tower control schematic diagram
- Telephone cipher circuit
- Vehicle electronic fuel gauge circuit
- Enhanced password lock circuit using AE1169
- Smart transmitter circuit diagram with hart interface
- Chinese learning machine disk drive interface card circuit diagram circuit
- 3V-5V level conversion circuit diagram
- H-bridge drive circuit schematic diagram and enable control and direction logic
- Improved connection method of triode switch circuit circuit diagram
- Circular drive circuit diagram composed of 3 triodes
- Long-distance FM transmitter circuit diagram made of high-frequency triode
- A single-section transistor performance test circuit
- Mixing circuit
- Transistor time relay circuit three
- Rechargeable time relay circuit 2
- 20V, 500mA regulated power supply circuit
京公网安备 11010802033920号