‘Sound/Radio Circuits’ Category

Band 2 Preamplifier Circuit

This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88 - 108 Mhz. click to enlarge the schematic The circuit uses two 2N...

 

This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88 – 108 Mhz.

click to enlarge the schematic

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The circuit uses two 2N3819 FET’s 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.

Circuit : Andy Collinson zen22142.zen.co.uk

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Crystal Radio (and other purpose) Audio Amplifier

 

Here is a simple audio amplifier using a TL431 shunt regulator. The amplifier will provide room-filling volume from an ordinary crystal radio outfitted with a long-wire antenna and good ground. The circuitry is similar in complexity to a simple one-transistor radio but the performance is superior (with the exception of the amazing one-transistor reflex ). The TL431 is available in a TO-92 package and it looks like an ordinary transistor so your hobbyist friends will be impressed by the volume you are getting with only one transistor and the amplifier may be used for other projects, too. Higher impedance headphones and speakers may also be used.

An earphone from an old telephone will give ear-splitting volume and great sensitivity! The 68 ohm resistor may be increased to several hundred ohms when using high impedance earphones to save battery power.

crystal radio amplifier

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Stereo Phono Preamplifier [RIAA Filter]

 

In the below exist a classic preamplifier PHONO of correction RIAA, for those who they insist they use disks of vinyl. For good precision in the reproduction of sound, should the materials that find in the negative feedback and correct RIAA, to be good quality, as resistors of 1% metal film, the capacitors polypropylene and Mylar.

phone preamplifier

The capacitor C8, adaptation in the input, can change with such price, so that it suits with the characteristics of cartridge that we will use. In the place of IC1 we can use also the LM833 or other completed low noise integrated circuit.

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