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FM wireless microphone circuit with voltage regulator circui
2016-11-05 06:44:2671The circuit consists of three parts: 1 . Audio amplifier section; 2 . High-frequency oscillation part; 3 . Regulators parts. The signal is sent into a ...
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The 40-line medical use wireless calling system circuit
2016-11-05 04:37:3764In figure 1 is one of the encoding emitter circuits, the system is equipped with 40 emitter circuit. In figure 2 is the reception display circuit. We d...
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Wireless Ir Security System
2016-11-05 03:50:1967This system contains an IR transmitter, an IR receiver/RF transmitter, and an RF receiver/alert beeper. Two IR LEDs in the transmitter transmit a pulse...
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Wireless microphone circuit with NAND gate
2016-11-05 01:02:027474LS04 is a TTL integrated circuit, there are six single-end input NAND gates. Three NAND gates can form an oscillator. When the power supply voltage i...
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Wireless remote control/touch dimmer circuit RCM1A/RCM1B
2016-11-04 16:11:1672The wireless remote control/touch dimmer circuit is designed as one kind of incandescent lamp dimmer switch that is composed of the radio remote contro...
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Wireless FM Emitting Circuit of 3000 Meters Launching Distan
2016-11-04 14:27:2570The work voltage and current are 9V and 2～6mA respectively and the element's parameters are shown as the aboved picture.BG1 is 9018,BG2 is C1959(It c...
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Wireless remote control electric initiator 1
2016-11-04 12:07:5363The wireless remote control electric initiator circuit is composed of wireless remote control transmitter and wireless receive initiation circuit. The ...
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WIRELESS_FM_MICROPHONE_1
2016-11-04 07:58:1567Adjustable capacitor C10, and coil L1 form a tank circuit that, in combination with Q1, C2, and R1, oscillates at a frequency on the FM band. The cente...
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Circuit of Encryption Wireless TV
2016-11-04 03:45:2671The circuit of encryption wireless TV with 1W transmit power is as shown. The input signal are audio and video signals, and the launch channel is decid...
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Extend the range of your M2M product using wireless repeater
2016-11-03 15:37:3169This article describes the Extend the range of your M2M product using wireless repeaters (LM317). The principle is very simple, very practical. The cir...
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Phase locked loop secondary frequency conversion wireless tr
2016-11-03 15:14:3263The NT230 launch module uses the special import high stability crystal (it is not the surface acoustic wave resonator). It outputs the stable 230MHz ra...
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The wireless emitter microphone circuit--high sensitivity mi
2016-11-03 11:19:5174The circuit is simple and cheap, whose output power is not higher than 5-8mV, the emitting range is about 300m in citizen area, the signal is received ...
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The wireless reception headphone circuit
2016-11-03 10:19:3465TDA2822-B-B wireless reception headphone is the tool that students receive the teaching audio. The writer has drawn a physical map, which is shown in t...
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Transceiver module which is composed of the wireless remote
2016-11-03 06:28:5665This governor has three gears of wind speed: strong, middle and weak, you can control it by the wireless remote control method or touch the switch, and...
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The FM modulation wireless microphone circuit
2016-11-03 00:02:2367In the figure is the FM modulation wireless microphone circuit, in fact, this is the FM modulation commutator whose frequency is 80～90MHz. The workin...
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Phone wireless ringing circuit(transceiver module composed o
2016-11-02 11:32:1862Transmitter and phone line are parallel. They dont need any other power. Blocking effect of capacitor C1 avoid the transmitter affecting the normal ope...
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Wireless remote control switch circuit 7
2016-11-02 07:24:4879The wireless remote control switch circuit is composed of the wireless remote control transmitter and receiver wireless remote control circuit. The rad...
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The infrared wireless headphone circuit
2016-11-02 03:19:1467As the inductive wireless headphone emitter must be fixed on the wall or the ceiling of the room, it can't be used outside, which is the weakness of in...
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The 40-line medical use wireless calling system circuit
2016-11-02 01:58:5463In figure 1 is one of the encoding emitter circuits, the system is equipped with 40 emitter circuit. In figure 2 is the reception display circuit. We d...
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One kind of wireless remote control circuit
2016-11-01 20:57:5071The remote control transmitter is composed of the DTMF generator and the FM transmitter circuit. Here we use one piece of UM91214B phone specific IC to...
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WIRELESS_FM_MICROPHONE
2016-11-01 19:21:1066Transistor Q1 acts as an amplifier for condenser microphone MIC1. The output of Q1 is applied to the base of transistor Q2 through a 4.7- μF capacitor...
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Intelligent wireless security system design circuit
2016-11-01 18:58:4971The intelligent wireless security system is composed of the sensor, the family intelligent alarm, the property management center alarm-receiving host c...
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The infrared monitor wireless alarm circuit
2016-11-01 18:47:1760In the figure is the infrared monitor wireless alarm circuit. The circuit consists of the infrared monitoring emitter and the infrared reception circui...
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The over-temperature wireless alarm circuit
2016-11-01 17:01:0267With modern electric technologies, it's common to install a set of constant temperature control device for some equipment that works in high temperatur...
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WIRELESS_CAMCORDER_MICROPHONE
2016-11-01 13:49:1260A 741 op amp acts as an audio amplifier and frequency-modulates VHF oscillator Q1 via varactor D2. L1 is 2.5 turns of #18 wire on a 5/16,-inch-diameter...
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LM1871 (electronic toys and model cars) wireless remote cont
2016-11-01 09:55:1573The LM1871 is designed as the wireless remote control launch coding circuit that can be used in the electronic toys and model cars. The internal circui...
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The microwave detection wireless alarm (S&P27)
2016-11-01 07:00:0566In figure (a), when the detecting circuit TWH9250 is detecting the object signal, the terminal O is outputting a low LEV, and the relay K is connected....
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multipurpose wireless remote control switch circuit
2016-11-01 01:43:5171This remote control switch uses wireless code/encode mode, which is not limited by aeolotropy, the beeline control distant is ≤100ｍ.The switch can ...
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