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Fm transmitter
This transmitter circuit is designed to be used for aligning FM radio receivers. It has a microphone amplifier with automatic gain control. The FM modulation is a voltage oscillator and the final stage is built with MOSFETs. A lowpass filter at the output assures the transmission of a clean 10 … 50 mW FM signal. [...]
Basic infrared transmitter
This infrared tranmitter is intended for use with this infrared receiver.
It works with 2 - 1.5V batteries or a 3V lithium battery. To give a compact assembly and still a good frequency stability, the circuit uses a oscillator with outpashing network. Current consumption depends on power supply and duration as S1 remains pressed. When [...]
Infrared switch operated by remote
SFH505A made by Siemens combine infrared diode receiver, amplifier, demodulator and a filter band pass for minimizing interferences. This circuit work together with this infrared transmitter.
The output signal of IC1 has the impulse duration limited to a maximum value. This fact is exploited by the associated transmitter for obtaine a maximum radius [...]
