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FM Band Preamplifier - Here is a high performance RF amplifier for the FM band which can be successfully built without any special test equipment. The grounded-gate configuration is inherently stable without any neutralization if reasonably good layout techniques are employed. The output transformer is designed to resonate with the FET's drain capacitance at about 92 MHz giving the amplifier the highest gain at the low end of the band where the weaker stations operate. No tuning capacitor is needed as long as the transformer is built precisely as described __ Contact: Charles Wenzel of Wenzel Associates, Inc. FM Booster - Here is a low-cost circuit of an FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired...__ Electronics Projects for You
FM bug 420-480 MHz - How about getting that old Nokia phone out of your drawer and turning it into something freakishly cool? I will not lie to you, you will need a few tools and skills such as soldering/desoldering and making PCBs. Here you can download Sprint-Layout__
FM Radio - Last summer vacation, I had an opportunity to be in dad's hobby workshop and decided to have a look at my pending projects. (I am no longer a science student but now in School of Fashion Technology for my BS Degree) I realized that I had a lot of parts in boxes that I ordered and must be utilized! ! I decided to complete this FM Radio project as all that was to be done was to design a board. __ Designed by Nina Gajjar
FM radio active antenna - Today’s wireless communication world revolutionized organizations who are well advanced (& advancing) in design of full fledged compact high gain noise active antenna. This antenna revolution persuaded us to design an active antenna amplifier __ Contact KAJA NAJUMUDEEN & CHARLES
FM Radio Microphone with Internal Loop Antenna - This article began as a design guide for hyper cranial erogenic field generators, however, your primitive earth brains are completely unable to respond to erogenic fields in the 100MHz region. I personally had a brain upgrade (for purely medical purposes of course) so I am able to respond __ Contact: Charles Wenzel of Wenzel Associates, Inc.
FM Receiver using MPF102 - An FM regenerative receiver using a single FET and one audio amplifier IC . __ Designed by Andy Collison
FM Receivers - Here is how you make a superregenerative circuit. Choose a regenerative amplifier circuit configuration that requires more current during oscillations than when not oscillating. Adjust the regenerative amplifier to oscillate. Add a small circuit that uses the current of the amplifier to charge a capacitor while oscillations are taking place. Once the capacitor is charged, the voltage on__
FM Stereo Modulator - This circuitry is used for generating a high quality FM stereo multiplex signal that is suitable for driving mono FM transmitters. The Rev E2 FM stereo multiplex generator is the most recent design in a series of circuits that have appeared on this site. This version features improvements to the audio mixer stage, better gain adjustments in the audio filter stage and a rework of the multiplexer stage. When it is adjusted properly, the Rev E2 design produces an FM stereo signal with excellent fidelity. __ Designed by Forrest Cook
FM Synthesizer N°1 - in order to simplify the transmitter design, we've used the new pll circuit from Motorola :the MC145170. This PLL includes the prescaler and a serial standard bus called SPi. __ Designed by Michel P
FM Synthesizer N°2 - This new FM transmitter is very simple and doesn't need any RF tuning. First of all , we have used an integrated VCO: The POS150 from Mini-circuits. This excellent RF circuit covers all the FM Band in a voltage range of 4V to 8V. The Kvco factor is very stable all over the FM band, (08/08/08) __ Designed by Michel P
FM Telephone Bug - Receive telephone conversations on any FM radio with this neat little device. __ Designed by Tony van Roon VA3AVR
FM/ AM Regenerative Receiver - Two transistor receiver __ Contact blehack @ yahoo dot com
FM3 Mods - Please remember, audio equipment can contain high voltages, so only undertake modifications if you know what you're doing. Peter found that the following modifications gave improved performance from his FM3. The capacitors that can be upgraded are C113 C114 and C121 in the PSU and C100 and C104 in the signal path. They are clearly marked on the circuit board and have their polarity indicated with + and - symbols - you do need to fit the replacements the correct way round __ Designed by Peter Maddex |
