Archive for April, 2008
Wideband UHF Amplifier - antenna tv amplifier circuit
This UHF wideband amplifier ( Ultra High Frequency amplifier ) has a total gain of 10 to 15 dB in the 400 - 850 MHz domain frequency so it can be used where the tv signal is weak.
For this UHF antenna tv amplifier to work correctly you need to cut the components pins as short [...]
Wireless headphones transmitter circuit schematic
This wireless headphones transmitter assures a quality reception over 2 meters. The oscillator frequency is between 1750KHz and 3500KHz and for antenna we use a ferrite bar. IC1 amplifies the audio signal and TC1 is a buffer. D1 signals that the transmitter is on and is a voltage stabilizer for the oscillator .
L1 is a [...]
Wireless headphones receiver circuit schematic
The wireless headphones receiver presented is an standard application of ZN415 produced by Ferranti ( short wave receiver ). ZN415 assures a quality reproduction, has a 1.5 battery alimentation and contains a MA detector and audio amplifier.
The current consumption is < 5mA, L1 has 40 turns, 0.2 Ø copper and 20mm Ø ferrite. C1 is [...]
