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Medium Wave Active Antenna - This circuit is designed to amplify
the input from a telescopic whip antenna. The preamplifier is designed to
cover the medium waveband from about 550Khz to 1650Khz..... [Circuit : David
Sayles] |
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Medium Wave DX Receiver - The photo opposite shows what you can do
with a Lazy Susan and a 16" Embroidery Hoop! This loop antennae work very
well on the Medium Wave band, providing good gain, directivity and noise
rejection…. [Duncan from Wellington, New Zealand] |
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Miniature FM Radio Receiver using TDA7088 - The electronic diagram
of the monophonic FM receiver made with TDA7088T is shown on Pic.4.12. If
built with SMD components it can be placed in a matchbox, altogether with
two button-type batteries. The operating principle of this device is given
in the previous t(added 11/05) |
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MK484 AM Receiver - A complete AM radio set based on the MK484 IC
(formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker…
[Designed by Chad Castagana] |
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More crystal sets - Response to December's column was so favourable that we
return to crystal sets and allied topics this month. Keep reading to find
out how to improve your AM broadcast reception, make your crystal set deliver hi-fi
audio and set a fashion trend with the all-new 'wearable wireless' pedestrian mobile
crystal set....amateur radio construction projects…. [from Peter Parker's website] |
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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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MPF102 FM Receiver - An FM regenerative receiver using a single FET and one
audio amplifier IC….((electronic schematic / circuit added 4/02) |
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MPF102 Receiver - Schematic only. [Designed by Patrick] |
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MRX 40 Mini Receiver - (design added 8/03) |
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Nostalgic Crystal Radio - ….... |
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Novel crystal set requires no antenna, earth - amateur radio construction
projects…. [from Peter Parker's website] |
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One Transistor Regenerative Receiver - This radio is sensitive enough to
tune 20 stations across the FM band, some with volume high enough to drive a small PM
speaker. The ability to tune 88.9 MHz and 89.1 MHz is testimony of its selectivity.
The signal-to noise ratio rivals that of the better walkman type radios.... [Designed
by Phillip Crane mailto:plcrane@delphia.net] |
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One-Transistor Amplifier/Detector - An amplifier may be added to boost the
audio level as shown below. The current consumption of this amplifier is quite low and
a power switch is not included. Disconnect the battery when the receiver is stored for
long periods….(added 04/05/06) |
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One-transistor Regenerative AM Receiver - A classic design revamped
slightly. Features a single-transistor regen stage, and a range of 1000 miles with a
4-foot antenna. Perhaps the best "survival radio",….(Circuit design added 06/06)
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Op Amp Based FM Transmitter - An low power FM Transmitter using an op-amp as
the audio preamp and a single transistor as the RF amplifier… [Designed by Kamran
Ahmed] |
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OpAmp Radio (Aaron Cake) - (electronic schematic / circuit added 04/03/02)
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Passive-detector receiver keeps
you informed, entertained during flights - 12-May-05 Issue of EDN
Receive HF AM signals without battery power.... [Design Idea by David Prutchi, PhD,
Voorhees, NJ; Edited by Brad Thompson] |
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Popcorn direct Conversion receiver - schematic for a no-frills, relatively
low-cost CW superhet receiver with a 4.00 MHz Intermediate frequency. There is no AGC
or RF gain control, however this receiver has good large signal handling capability.
This receiver uses just 6 bipolar transistors and an op amp for reasonable volume into
headphones. Much....(design added 05/08) |
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Q Multiplying Loop Antenna - (electronic schematic / circuit added 4/02)
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