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R-399-A Communications Receiver - ….(circuit design added 06/09) |
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RC Receiver hosts two independent Switches - 04/05/06/96 EDN Design Ideas /
(added 8/05) Typical inexpensive radio-control (RC) systems have servo-motor outputs,
but no on/off switch outputs. You can add two independent RC switches to a system
without making any transmitter or receiver modifications. |
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Receiver - (electronic circuit added 4/05) |
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Receiver Battery Low Voltage Alarm - ….(design added 08/08) |
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Receiver Building Blocks - (design added 8/03) |
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Receiver Circuit-Ultrasonic Switch - The circuit described generates (transmits)
ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control
system this cirucit comprises of a mini transmitter and a receiver circuit.
Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from
the transmitter and switches on a relay |
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Reflex Receivers - The reflex receiver uses the same transistors to amplify the RF
and the audio independently, effectively doubling the transistor count! Reflex
designs were born in an era when transistors cost several dollars each and pressing
them into "double duty" was worth some effort.....(design added 8/03) |
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Regenerative Receivers - (design added 8/03) |
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Regenerative Shortwave Receiver - (design added 8/03) |
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RF receiver circuit - (electronic Circuit / Schematic added 10/04) |
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RFRXD0420 ASK Receiver Reference Design - Microchip Application Note Published
27-Dec-02 (app note added 6/06) |
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RFRXD0420 Receiver Module - Microchip Application Note Published 20-Jun-03 (app
note added 2/06) |
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RX3302 superregenerative receiver module schematic - superregenerative receiver
module schematic (design added 8/03) |
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Short Wave Regenerative Receiver - Sensitivity and selectivity are the major
concerns of a short wave enthusiast when he looks up for a receiver. Commercial
communications models with superhet circuitry surely satisfy his requirements, but
these are expensive. He would rather go for a homebrewed radio, being a regenerative
receiver an affordable choice.....(added 11/05) |
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Simple Circuit Detects Current Pulses - 01/06/94 EDN-Design Ideas / (added 3/03)
The pulse detector provides a visible indication of positive and negative current
pulses. The pulses amplitudes can vary from20 to150 mA. The pulses durations can range
from10 to40 msec, and their repetition rate can span40 to180 pulses/minute. |
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Simple Crystal Radio - The crystal radio gets its name from the galena crystal
(lead sulfide) used to rectify the signals. A "cat's whisker" wire contact was moved
about the surface of the crystal until a diode junction was formed. The 1N34A
germanium diode ….(added 04/05/06) |
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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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Single Chip Builds Tiny Aircraft Receiver - 09/25/97 EDN-Design Ideas / (added
3/03) |
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SOP Direct Conversion Receiver - (design added 8/03) |
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SOP Receiver - (electronic Circuit / Schematic added 10/04) |
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SSB ADAPTOR - Build this simple adaptor to receive single side band SSB on short
wave AM receivers. . (added 9/04) |
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SSB AF Filter - This is a simple filter that restricts the LF response a little as
well providing quite a heavy HF roll-off. The prototype has enhanced a Yaesu FT101B
that was only fitted with an AM IF filter. The IC is an LM358. (added 02/05) |
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Sudden Ionospheric Disturbance SID Receiver - (schematic / circuit added 6/07) |
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Sudden Ionospheric Disturbance SID Receiver #1 - (circuit / schematic design added
6/06) |
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Sudden ionospheric disturbance SID receiver #2 - (circuit / schematic design added
6/06) |
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Super 80 Ultra Simple SSB Receiver for 3.5 MHz - (electronic schematic / circuit
added 2/05) |
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Superregenerative 27MHz Receiver - (design added 8/03) |
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Super-Tiny Receiver - Here is a VLF receiver built into an earphone plug! I
recently acquired a digital voice recorder to replace the microcassette recorder above
and discovered that it is extremely sensitive, easily amplifying the signal from the
FET version of the computer-powered receiver above. This new receiver consists of a
very low current JFET, a bias resistor (2, 22 megohms in series) and a capacitor;
that's all! The recorder is designed to power electret microphones so no battery ...
(electronic design added (6/07) |
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SW Receiver Using MK414 - ….(electronic schematic added 03/08) |
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SW Receiver using the ZN415 - (design added 8/03) |
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Synthesized HF Receiver - (design added 8/03) |
