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propeller receiver – Circuit Schematic
propeller receiver
A very simple direct conversion receiver based on the NE602 Gilbert Cell mixer and a LM386 audio amplifier. The circuit is based onthe famoussudden receiver des...
am radio – Circuit Schematic
am radio
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PSK transceiver circuit – Circuit Schematic
PSK transceiver circuit
The receiver is a basic SA612 circuit. (U5 and U6) The LO for 20 meters is about 9 MHz and an IF of 5.068 MHz. The IF filter uses two crystals and has a peak re...
am transmitter 813 style part 3 – Circuit Schematic
am transmitter 813 style part 3
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fm tracking transmitter circuit – Circuit Schematic
fm tracking transmitter circuit
This is a design for the tracking transmitter of audio tone in FM band frequency. The circuit can be used a signal transmitter or remote control transmitter. Th...
medium power fm transmitter circuit – Circuit Schematic
medium power fm transmitter circuit
This is a design circuit diagram of a moderate power FM transmitter circuit. This circuit is built operation by two transistors. This is a figure of complete ci...
ft817 keypad circuit diagram – Circuit Schematic
ft817 keypad circuit diagram
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fm transmitter – Circuit Schematic
fm transmitter
The first resistor on the left in the schematic says 68k. This will vary depending the the microphone. In our case we used a microphone from digikey with a 1. 5...
tea5711t application circuit diagram – Circuit Schematic
tea5711t application circuit diagram
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mini fm transmitter circuit – Circuit Schematic
mini fm transmitter circuit
Here is the mini FM transmitter circuit using 2 transistor. Audio sensitivity is very good when used with an ECM type microphone insert. This smallFM transmitte...
avr superhet – Circuit Schematic
avr superhet
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navigator 555a radio direction finder rdf circuit diagram – Circuit Schematic
navigator 555a radio direction finder rdf circuit diagram
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am bcb radio receiver 2 – Circuit Schematic
am bcb radio receiver 2
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tiny fm tv jammer – Circuit Schematic
tiny fm tv jammer
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build one transistor fm radio – Circuit Schematic
build one transistor fm radio
The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction a...
Rx Decoder – Circuit Schematic
Rx Decoder
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80M – Circuit Schematic
80M
This 80M receiver design includes the necessary switching to allow the SSB filter and first I. F. amplifier to be used for transmitting. The receiver stages fro...
fredbox – Circuit Schematic
fredbox
This is the story of the Fredbox, a rig that first saw the light of day in 1974 in Cambridge. In the last few months it has been restored to full working order ...
make this one transistor radio receiver – Circuit Schematic
make this one transistor radio receiver
This is probably the simplest radio that one could ever imagine of making. The circuit is so simple that it could be finished assembling within a few minutes an...
noise canceller – Circuit Schematic
noise canceller
Are you situated in an area where there is significant QRM/QRN noise (QRM: man-made noise and QRN: naturally occurring noise) present on the HF Band making it i...