HOME   |   STORE   |   SCHEMATICS   |   DOWNLOADS   |   SEARCH  

Circuit-Zone.com - Electronic Projects



Simple FM Radio Bug
Posted on Monday, September 10, 2018   •   Category: FM Transmitters

Simple FM Radio Bug

In the mid 1970s large numbers of small FM transmitters, operating in the FM radio broadcast band (88-108 MHz) appeared on the market. It started with a self-build kit from the Danish manufacturer Jostykit that allowed everyone to build a small FM transmitter for a few Euros. Such transmitters generally consist of a single transistor oscillator with a simple resonance circuit, sometimes with an extra transistor that is used as audio pre-amplifier. The image shows a few examples that were available in European electronics shops in the mid 1970s. The transmitter shown here was built in the mid-1970s and measures just 1 x 2 cm. When properly built, it may have a range of several kilometers.

     Portable FM Transmitter
     Mini FM Broadcast Transmitter
     PLL FM Transmitter
     BA1404 HI-FI Stereo FM Transmitter
     SAA1057 PLL Synthesized FM Transmitter
     Wideband SWR Meter
     Micro Spy PLL FM Transmitter
     28W Power RF Amplifier for FM Broadcast 88-108 MHz 2SC1946
     Coilless FM Transmitter
     50mW FM PLL Transmitter SD USB MP3 Player
Simple FM Radio Bug

 

Build Accurate LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and reset function to make sure the readings are as accurate as possible ... [more]



Circuit-Zone.com © 2020. All Rights Reserved.
AC / DC Innveters
AM Radio
Amplifiers
Antennas
Arduino
Audio Attenuators
Audio DAC
AVR
Battery Chargers
CNC Milling Devices
Counters / Frequency Meters
Fluorescent Lamps
FM Radio / Receivers
FM Transmitters
Frequency Wave Generators
Headphone Amplifiers
iPOD Hacks
LC Meter
LED
Miscellaneous
Motor Controllers
MP3 Players
Oscillators
Oscilloscopes
PC Circuits
PCB
Phone Circuits
PIC
PLL Circuits
Power Supplies
RC Servo Motors
Remote Control
RF Radio Frequency
Robots
Sensors
Solar Circuits
Stepper Motors
Stereo Encoders
Test and Measurement
Timer Circuits
TV Transmitters
USB Circuts
USB Interface Adapters
USB Soundcards / USB Headphones
Video
Volume Control