Rangkaian-Elektronika.Com » Sound/Radio Circuits

FM Transmitter : 1,5 Volt FM Transmitter 50 Meters Range

admin — Tue, 23 Feb 2010 22:33:03 +0000

Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan’s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM radio over a remarkable distance. I’ve seen lots of designs through the years, some of them were so simple, some of them were powerful, some of them were hard to build etc.

Here is the last step of this evolution, the most stable, smallest, problemless, and energy saving champion of this race. Circuit given below will serve as a durable and versatile FM transmitter till you break or crush it’s PCB. Frequency is determined by a parallel L-C resonance circuit and shifts very slow as battery drains out.

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Mini Amplifier

admin — Wed, 17 Dec 2008 08:25:54 +0000

Here is another mini circuit project. This is a Mini Amplifier that have a simple tone control. Here is the Scheamatics

Mini Amplifier

You can comment here if get something wrong with this electronic schematic design

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Audio : Power Amplifier Circuit with 2N3055 Power Ampl

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Mini FM Radio Receiver

admin — Wed, 17 Dec 2008 08:16:18 +0000

Here is a small project about FM receiver that you can built with a little cost. The schematic below

This is a very simple kind of receiver. The dificult point is to get the inductor coil, i think there a no electronic store that sell this coil. so you must make it by yourself

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FM Transmitter : 1,5 Volt FM Transmitter 50 Meters Range Mini FM tr

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Mini FM Transmitter

admin — Wed, 17 Dec 2008 08:05:40 +0000

Below i have finished develop a mini fm transmitter that work fine at frequency 88 – 108 MHz. This is a simple FM Transmitter that can be used in a small city (2-4 Km). Here is the schematics

mini fm transmitter

if you could not understand please feel free to comment here

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FM Transmitter : 1,5 Volt FM Transmitter 50 Meters Range Mini FM tr

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Band 2 Preamplifier Circuit

admin — Thu, 13 Nov 2008 17:51:20 +0000

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 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

admin — Wed, 23 Jan 2008 17:53:36 +0000

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.

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Audio : Power Amplifier Circuit with 2N3055 Power Ampl

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Stereo Phono Preamplifier [RIAA Filter]

admin — Tue, 01 Jan 2008 14:53:01 +0000

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.

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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Audio : Power Amplifier Circuit with 2N3055 Power Ampl

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