Control Circuit

remote control tri-proportion controller circuit

Published:2011/7/12 7:37:00 Author:Lena | Keyword: remote control, tri-proportion controller

The tri-proportion controller is used to control electromotor rotate speed or oil plants engine accelerograph bulk etc in various power remote control models. Here introduces code/encode and control circuit which can realize above functions.This device realizes the remote tri-proportion control by altering transmitter modulation frequency. Figure 1 is the transmitter frequency regulation circuit, altering the bulk of potentiometer RP can make oscillator frequency change between 100Hz and 1 kHz, the output end of this circuit connects modulation input of high frequency transmitter.   (View)

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radio frequency chip RF401 and constituted high credibility remote control circuit

Published:2011/7/12 3:40:00 Author:Lena | Keyword: radio frequency chip, high credibility, remote control

RF401 is Norway Nordic company newly protrusive data transmission band 433MHZ single piece wireless transceiver chip, this chip integrates high frequency transmitting, high frequency receiving, PLL synthesization, FSK modulation, FSK demodulation, multi-channel switch etc function, and has excellent performance, low power loss, easy usage etc features. Periphery components of nRF401 are very few, only involve one criterion crystal oscillator and few passive devices without debugging parts, this brings huge convenience for development and manufacture.Table 1 is NRF401 electric performance parameters.Table 2 is NRF401 pin function diagram. Paremeters Value Unit 工作频道 433.92/434.33 MHz 调制方式 FSK 　 频偏 15 KHz 谢频输出功率 0.4k,3v 10 dBm 接收灵敏度 0.4k,BR=20 kbit/s BER<10 -105 dBm 最大传送数码率 20 K bit/s 适用电压范围 2.7~5.25 V 接收状态功耗 250 uA 发射状态功耗 -10 dBM 8 mA 等待状态功耗 8 8uA