Showing posts with label 2. Show all posts
Showing posts with label 2. Show all posts
Saturday, August 31, 2013
2 Channel Audio Mixer Using by Transistors
This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio level.
2 Channel Audio Mixer Circuit diagram
This two channel audio mixer require a power supply with the output voltage between 9 to 12 volts . For the audio signal you can use a CD player, mp3 player or other audio device and for the microphone you can use a normal dynamic microphone .
2 Channel Audio Mixer Circuit diagram
This two channel audio mixer require a power supply with the output voltage between 9 to 12 volts . For the audio signal you can use a CD player, mp3 player or other audio device and for the microphone you can use a normal dynamic microphone .
Thursday, July 4, 2013
Band 2 Preamplifier
This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88 - 108 Mhz.
Band 2 Preamplifier Circuit Diagram
Band 2 Preamplifier Circuit Diagram
Notes:
The circuit uses two 2N3819 FETs in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:
The circuit uses two 2N3819 FETs in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:
- L1 4 turns of 18swg air spaced with a 1cm diameter, the tap is one turn up from earth end...
- L2 4 turns of 18swg air spaced with 1 cm diameter. The coupling coil is 1 turn interwound from the supply end. Enamel coated wire must be used.
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