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Frequency Modulation (FM) Circuits, Page 3
FM Circuits:  #'s - E     F-H     I - M     O - R     S - T     U - Z

Last Updated on: Monday, October 03, 2011 06:07 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Improved FM Stereo Modulator -  (electronic circuit added 7/03)
ISM Receiver with TDA5100/ TDA5200 -  ....
ISM Transmitter with TDA5100/ TDA5200 -  ....
LA1800 FM Radio -  3V superheterodyne FM receiver (08/08/08)
Linear FM 30Watt  -  ….
Linear FM 50Watt with BLY90 -  A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready. The present circuit can give 50-60W RF force of expense, with control smaller than 15-20W in the region of frequencies of FM, that is to say in the 88-108MHZ. Transistor that we selected for.....(electronic design added 6/07)
Low Pass Filter For FM 88-108 MHz -  Filter used for eliminate unwanted harmonic frequency at second and third. Notch filter, Band Pass Filter (BPF), and High Pass Filter (HPF) sometime combined in constructing LPF design. Schematic below for FM Broadcast Lowpass Filter 88-108 MHz….....
Low Power FM Transmitter -  Useful to retransmit the hi-fi to another FM receiver nearby, or as a wireless mic  (schematic / Circuit design added 9/02)
LowPass Filter -  The schematic you find here comes from another site on the internet, but because it's on so many sites, we don't know who actually designed it. However it's a nice one. Capacitors: C1,C4 22pF cer. C2,C3 51pF cer. Coils: L1,L2,L3 #18 bus wire, 1/4"diameter, 3 turns * Form the leads from the capacitors as shown in the little figure below. Then solder them from the pad to the outside ground area. * Be sure that the turns from the coil are seperated by the same distance as the diameter of the wire * Form the leads from the coils as shown in the little figure below. Then solder them in place. * Place the filter in a metal box, with rf-connectors on both ends ( SO239(=PL259), BNC or N-connectors)
Micro Spy with FETs -  Circuit and notes only, no circuit description given…. [Tony van Roon's circuit]
Micro Spy with TTL -  This circuit is old (70's) but since the 74LS13 is from the regular 74xx series and easy to obtain, I decided to keep the circuit in place until components are no longer available.  Not much to tell here. Performance is based on the 74LS13, a 'Dual 4-input Positive-Nand Schmitt Trigger'.  This circuit was experimental and so has no real purpose other than tinkering…. [written by Tony van Roon]
Micro Spy with Usw -  Circuit and notes only, no circuit description given…. [Tony van Roon's circuit]
Micropower FM BroADCasting Circuits -  (schematic / Circuit design added 9/02)
Minature FM Transmitter -  This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM radio.  It has a range of up to 1/4-mile (Tony van Roon's 400 meters) or more, depending on the line-of-sight, obstructions by large buildings,etc.  It is great for room monitoring, baby listening, nature research,..... [Tony van Roon's circuit]
Mini Tracker -  Lets you find things, using an FM radio to pick up the beeps….(added 04/07)
Miniature FM Radio Receiver using TDA7088 -  The electronic diagram of the monophonic FM receiver made with TDA7088T is shown on Pic.4.12. If built with SMD components it can be placed in a matchbox, altogether with two button-type batteries. The operating principle of this device is given in the(added 11/05)
Miniature FM Spy Mic -  This spy mic works from single 1.5 volts AA type battery cell. It is highly sensitive and has a range of 300 meters. You can use any HF transistor with cut-off freq. >300 MHz for Q. Use electret mic.  (added 11/05)
Miniature FM Transmitter -  (circuit / schematic added 5/03)
Miniature FM Transmitter #1 -  This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM radio.  It has a range of up to 1/4-mile (400 meters) or more, depending on the line-of-sight, obstructions by large buildings, etc.  It is great for room monitoring, baby listening, nature research, etc.....
Miniature FM Transmitter #3 -  Sensitive transmitter [Tony van Roon's circuit]
Miniature FM Transmitter #4 -  Schmatic with parts list and notes [Tony van Roon's circuit]
Miniature FM Transmitter #5 -  5 transistor transmitter…. [Paul K. Sherby]
Miniature FM Transmitter #6 -  upto 500 meter range [Tony van Roon]
Miniature FM Transmitter #7 -  There is no thrill like the thrill you get from operating equipment you have built yourself. If you have never built a project from a magazine before, let this be your first--you'll see how much satisfaction and fun you can have!… [Tony van Roon]
Miniature MW Transmitter -  circuit diagram of simple medium wave transmitter using BF494B.  This simple transmitter have a range of 200 meters.
Modulation Monitor -  very simple and useful circuit used to monitor on air transmission of your low power amplitude modulated transmitter.
Monaural FM Transmitter -  AN-543-MonauralFMTransmitter-Analog Device Application Notes.....[App Note]  
Morse Adaptor for your VHF/UHF FM rig -  Everyone knows that the best way to practice Morse is to use it on the air.  But how do you send Morse if you don’t have a multimode HF or VHF transceiver?  Well, you could hold a microphone up to a code practice oscillator, and hold the PTT down while pressing the key, but it’s very clumsy, and the transmitted tone is likely to be harsh.  Clearly something better is needed…. [from Peter Parker's website]
Morse Code Tutor -  A program (23kb) written in C++. Morse code uses dot and dash for communication. Still it is popularly used for communication is short wave bands. The Archive contains program source code and executable.
MPF102 FM Receiver -  An FM regenerative receiver using a single FET and one audio amplifier IC….((schematic / Circuit design added 9/02)


 
FM Circuits:  #'s - E     F-H     I - M     O - R     S - T     U - Z
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