Archive for June, 2008
Simple cable tv amplifier
This cable tv amplifier is a rf-amplifier designed to be quickly installed between two coaxial cables. Both input and output impedances are compatible with 75 Ω cables.
The main amplifier si T1 transistor, T2 is working as an emitter follower. The feedback bias is determined by R3 and R4. The total gain of this tv cable [...]
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 [...]
FET audio mixer
FETs are originally designed for high frequency applications but they can be used for audio frequencies and in fact they perform excellently in this area. This FET audio mixer is an example of FET’s versatility.
This mixer needs only four FETs and performs very well (actually you cannot expect a high quality mixer).
The mixer’s input impedance [...]
