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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….(added 04/05/06) |
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Transmission Line Drivers & Receivers for TIA/EIA Standards RS-422 & RS-423 -
National Semiconductor Application Note....[App Note] |
Two Transistor FM Transmitters (Rob van der Weijden) - A compact 2
transistor transmitter for use at VHF frequencies…. [Andy Collison's circuit] |
Two Watt Switching Power Supply - from 6V to14V (added 6/06) |
Ultra low frequency receiver - The frequency covered is from 0.1Hz to 10Hz
and useful signals are received up to 16Hz. The first Op-Amp, properly shielded, must
be installed close…. (added 9/07) |
Ultrasonic receiver - Schematic only, no circuit description |
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) |
VLF radio receiver schematic - (electronic circuit added 4/05) |
Wireless Alarm Transmitter and Receiver - Here are two circuits that make it
possible to add up to eight detectors to an existing alarm system without running a
single cable. Each transmitter has a unique number that is reported to the central
unit in the event of an alarm, and the transmitter battery condition is monitored.
….must register on this site.... [Published in Elecktor July/August 2010] |
ZN414 Portable AM Receiver - An AM portable radio receiver made from the
ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in
performance and pinout. (added 10/05) |
ZN414 Receivers - This is a project from the dim and distant past which has
proved to be a real winner. I have used it as the basis for an 8 channel proportional
R/C (AM) as well as a 145MHz FM "chat box". The receiver is very simple and is shown
below. It consists of a single transistor mixer then a ZN414 radio IC to provide the
gain and detection. A 741 OP-AMP is used as the final audio stage, but this could be
replaced with an LM380, if you want to drive a small loudspeaker.... [Design by Harry
Lythall - SM0VPO] |
ZN414 SW Receiver - A Short Wave Receiver based on the MK484 (formerly
ZN414) that includes the tropical bands and 49 metre bands....(electronic design added
6/07) [Andy Collison] |
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