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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)
Video/Audio Wireless Transmitter - To design and build a wireless
transmitter that works over the FM frequency and allows the transfer of a
video/audio signal over a certain distance to a FM tuner…..(circuit / schematic
design added 6/06)
VLF Natural Radio Reception - "Natural Radio" is a fancy name for
radio noise with natural origins, mainly lightning. At first, you might think
that listening to lightning crackles is pretty uninteresting but as it turns
out, electromagnetic radiation from lightning can travel great distances and
undergo strange modifications along the way....
VLF Upconverter for Shortwave Receiver - The schematic above is a simple up
converter which I used in conjunction with a short-wave receiver to quite successfully to
monitor solar flare activity a few years ago. You can use a 3.5 or 4 MHz crystal for Y1 to
up convert from about 10 KHz to 150 KHz to either 3.510 or 4.010 MHz respectively. A
long wire antenna was used here but a VLF loop antenna.... [Radio-Sky Publishing]
Wireless Microphone - Circuit & notes only, no circuit description given…. [Tony
van Roon's circuit]
Wireless Radio Data Link - This is a description of a very simple unit designed
and constructed for use as a wireless data connection between two nearby computers. The
error rate is excellent over short runs, and the transmission speed means that a useful
PPP....(added 6/06)
ZN414 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ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.
(electronic schematic / circuit added 4/02)
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]
