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Amplifier
Circuits: RF (Radio Frequency)
Page 5
RF (Radio Frequency): #'s
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Amplifier --
Main Page
Last Updated on:
Monday, October 03, 2011 06:08 PM
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Simple Op Amp Radio (Bowden) - This is basically a crystal radio with an audio
amplifier which is fairly sensitive and receives several strong stations in the Los
Angeles area with a minimal 15 foot antenna. Longer antennas will provide a stronger
signal but the selectivity will be worse and strong stations may be heard in.... (circuit
added 04/05/06) |
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Simple RF Noise Source - A noise generator with a wideband output signal is
always handy to have around when you’re adjusting receivers and other types of HF
equipment. The noise generator circuit described here uses the base–emitter junction of a
transistor (in this case a BF199) operating under reverse bias.….must register on this
site... [Published in Elecktor July/August 2010] |
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Simple RF Power Meter - simple RF power meter cum dummy load for low power
transmitters. |
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Simple Two-transistor Radio - Here is a simple radio that was designed to
minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high
as the one-transistor reflex but the simplicity is attractive. Strong stations will
provide plenty of volume....(electronic design added 05/06/07) |
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Smooth Tone Clickless CW SideTone Generator - This circuit is about as good as
it gets for generating morse code tones. It may be used as a code practice oscillator, a
tone generator for a keyer, a sidetone oscillator for a CW transmitter or an audio
Modulated CW (MCW) generator for an FM transmitter or repeater.... [G. Forrest Cook] |
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Superhet/Direct Conversion AM receiver for 181.818 kHz - This is a description
of an experimental AM receiver for VLF. It is crystal controlled to receive 181.818 kHz
(more or less) and operates as either a single conversion superhetrodyne or a direct
conversion receiver. The bandwidths are expected to be 15 Hz to 3.5 kHz in superhet mode
and 15 Hz to 10 kHz in the direct conversion mode....(added 6/07) |
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Terminal Interface with Minimum Mass Wireless Coupler - AT90S2313 This is a
Minimum Mass Wireless Coupler that connects a terminal, or PC running terminal software,
to other Minimum Masss Wireless devices by means of a 1200 baud data channel at 181.818
kHz. (circuits added 6/07) |
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Tiny Tuned Loop Antennas for the Minimum Mass Wireless Coupler - Loop Antennas
are considered to be "samall" when their diameter drops below about 1/10 of the wavelength
they are intended to be used at. In this case, I use the term "Tiny" because the antenna's
diameter is about 1/30,000 the wavelength, and at 5.5 cm....(design added 6/07)
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TL431 Crystal Radio 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 far superior. The
TL431….(added 04/05/06) |
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UHF TV PreAmplifier - This circuit is designed to work at UHF frequencies in the
range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV
signals…. [Andy Collison's circuit] |
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Very High Gain Crystal Earphone Amplifier - This simple, one-transistor
amplifier provides a voltage gain over 1000 (60 dB) for driving a high impedance ceramic
(crystal) earphone. The high gain is achieved by replacing the traditional collector
resistor ….(added 04/05/06) |
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Wide Band RF Amplifier for 10MHz-500MHz Input - This paper describes an RF
amplifier circuit which is suitable for the frequencies between 10MHz and 500MHz. These
kind of amplifiers are called wide band amplifiers.(07/07/07) [Author is Yilmaz Kalafat,
PE1PYJ] |
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Wireless for the Bench Top ATtiny12 - This section describes an
experimental low power, low bandwidth data signaling system that was initially made to
operate at 55 MHz (television channel 2 in the U.S.). Before operating a radio
transmitter, find out what kind of transmitter operation, if any, is permitted in your
locality. Radio transmitter operation is a serious legal matter. This
design....(added 6/07) |
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