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Simple VHF FM radio – Circuit Schematic
Simple VHF FM radio
The RF stage of the receiver is based on a transistor VT1, this stage works as a mixer and a local oscillator and it works as a synchronous detector. A cable of...
Sensitive envelope detector circuit diagram – Circuit Schematic
Sensitive envelope detector circuit diagram
This is a very sensitive envelope detector for AM radio. The circuit (see Fig. 1) provides linear detection of weak signals with modulation depth of 80. 85% The...
Radio and communication circuits 2 – Circuit Schematic
Radio and communication circuits 2
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Radio and communication circuits 1 – Circuit Schematic
Radio and communication circuits 1
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Loudspeaking radio receiver with a bridge amplifier powered by free energy – Circuit Schematic
Loudspeaking radio receiver with a bridge amplifier powered by free energy
While experimenting with different receivers and amplifiers powered by "free energy", it was found that it is more convenient to connect the audio amplifier to ...
Loudspeaking crystal radio receivers – Circuit Schematic
Loudspeaking crystal radio receivers
A lots of radio amateurs have an interest to power a simplest radio receivers with the "free energy", i. e. the energy, taken by the receiver antenna directly f...
How to improve the selectivity of the FM radio receiver – Circuit Schematic
How to improve the selectivity of the FM radio receiver
The FM radio receiver with PLL designed by A. Zaharov [1] still attracts the attention of radio amateurs. As noted in a publication of the magazine "Radio" [2, ...
HAM RADIO SW RECEIVER – Circuit Schematic
HAM RADIO SW RECEIVER
A simple radio receiver circuit is shown in Fig. 1. This receiver is designed for reception of signals of amateur radio stations operating in the SW band of 10,...
FM receivers with PLL – Circuit Schematic
FM receivers with PLL
This article describes some simple FM direct conversion radio receivers with phase-locked loop (PLL). This receivers uses the method of locking the local oscill...
FM Crystal Radio Receivers – Circuit Schematic
FM Crystal Radio Receivers
The notion of "crystal radio" is strongly associated with huge antennas and radio broadcasting on long and medium bands, in this article, the author describes t...
AM Synchronous Demodulator – Circuit Schematic
AM Synchronous Demodulator
The advantage of synchronous reception of AM signals is widely known. It includes high selectivity, linearity of detection and a low noise level at the output c...
A regenerative SW receiver with automatic regeneration control – Circuit Schematic
A regenerative SW receiver with automatic regeneration control
This is the tuned radio frequency receiver for shortwave (25 meter band, 11. 7. 12. 1 MHz). It was created as experimental design for further experiments with t...
Radio and communication circuits – Circuit Schematic
Radio and communication circuits
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SDR TX 50MHz – Circuit Schematic
SDR TX 50MHz
Making 90 degree phase shift on VHF. This IQ Oscillator is easy way with two logic IC`s. 74AC04 inverter is used as oscillate circuit. C5 and R6 is phase shifte...
Circuit of power fm transmitter transistor 2n2218 audio wireless 1KM – Circuit Schematic
Circuit of power fm transmitter transistor 2n2218 audio wireless 1KM
This small transmitter can arrive the more than 1 km in favorable conditions of emission. The modulation can be made so much with a microphone, for an electrets...
Circuit Power transmitter of communitarian wireless TV lm1889 audio and video – Circuit Schematic
Circuit Power transmitter of communitarian wireless TV lm1889 audio and video
This small circuit transmitter processes the signs of audio of a sound table or microphone, and the signs of video of a camera, or still the audio signs and vid...
Circuit FM transmitter for MP3 and MP4 Player 2n2218 and 741 opamp – Circuit Schematic
Circuit FM transmitter for MP3 and MP4 Player 2n2218 and 741 opamp
Evolution FM transmitter with 2n2218 with audio amplification step using LM741 op amp with audio input for MP3, MP4, mobile, computer and other audio sources, b...
fm stereo transmitter ba1404 diagram – Circuit Schematic
fm stereo transmitter ba1404 diagram
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Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358 – Circuit Schematic
Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358
This HD TV UHF wideband amplifier (Ultra High Frequency amplifier ) has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency so it can be used where ...
Circuit for power linear RF amplifier with BLY90 – Circuit Schematic
Circuit for power linear RF amplifier with BLY90
It is to be used as amplifier of potency of RF in the high strip of of the power source that should be capable to supply a tension of 13 volts with a current of...