Transmitters
Mini FM Transmitter MAX2606
With MAX2606 we can make a small mono fm transmitter. It is build with MAX2606 and covers at least 20m with 1.5 m long copper wire antenna. You can use this transmitter as an oscillator but change the 1000pF capacitor from the antenna with 15pF.
MAX 2606 output power is -10dBm, that means something around 100uW [...]
Infrared transmitter circuit schematic
This infrared transmitter use PWM , puls width modulation.
The transmitter is equiped with LM 567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to modulate IC1. Infrared transmitter frequency is adjusted with P2 between 25 and 40KHz.
Stereo Pll fm transmitter BH1417
This BH1417 pll fm transmitter includes features like: pre-emphasis, sound limiter, stereo transmission, low pass filter, pll circuit, fm oscillator and rf output buffer. The sound limiter maintains the same audio level so no distorsions occur, the stereo encoder separates the left and right channel enabling stereo transmission, the low pass filter blocks [...]
