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Dynamic mic preamplifier
This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses two identical integrated preamp circuits. The second preamp is used in identical manner for the second channel of the stereo microphone.
Diagram bellow shows the pin numbers (in [...]
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. [...]
Speech processor - clipping and dynamic compression
To obtain the best modulation result of a transmitter you can use 2 ways: clipping and dynamic compression. Both methods have disadvantages: clipping - there is no constant signal carrier and so the transmitter has a tendency to be overmodulated or undermodulated and in dynamic compression degradation also happens because of the uncontrolled signal bursts [...]
