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Modulators Circuits   Page 1
Modulators:  #'s     A      C - D       E - F      G - L     M     N - O     P - R     S     T - V

Last Updated on:
Saturday, August 30, 2014 10:28 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
+10dBm LO Modulator For 1800-2000MHz Low Cost IQBG-2000 -  Application Note MiniCircuits.com  (app note added 08/08/08)
12V PWM Motor/Light Controller -  The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET. N Channel devices tend to handle more current than P Channel devices, they are also less expensive. The high side version of the circuit is useful when one side of the load has to be grounded....[G. Forrest Cook]
2 Transistor FM Transmitter (Rob van der Weijden) -  A compact 2 transistor transmitter for use at VHF frequencies.….(circuit added 10/09)
2 Transistor Transmitter (Rob van der Weijden) -  A compact 2 transistor transmitter for use at VHF frequencies…..(schematic / Circuit design added 8/08)
27 MHz FM Receiver -  The FMR-201 is a crystal controlled single channel receiver, comprising of receiving, decoding and open collector output sections….(circuit added 08/07/06) 

27 MHz Receiver -  This is a simple RF receiver mainly for low-distance digital radio receiver application. The analog output of this circuit should be connected to a schmitt-trigger signal conditioning circuit with a proper value capacitor (from collector of T3). L1 for 27Mhz is about 10 turns, 6 mm diameter coil body. …....
27MHz/ 49 MHz Walkie Talkie -  Lots of people are requesting walkie-talkie and RF remote control schematics, so here is some. Building these circuits needs special equipment and expertise in RF circuits. If you are going to experiment with these circuits, please....[Peter Jakab, Electrical Engineer, Engineer of Informatics]
3 Transistor FM Radio Bug -  Electroinic circuit schematic…. [from Harry Lythall's website]

4 MHz Amplitude Modulated RF Source -  A while back I needed an amplitude modulated signal source at 4 MHz.  This circuit was literally thrown together with parts laying on the bench. I built it dead bug style on a piece of copper clad board. It should work with little or no modification, other thano get it to oscillate, and at higher frequencies, you might have to reduce the capacitor values a little. Just be....(schematic / circuit added 6/07)
4-Transistor Transmitter (Paul C. Sherby) -  This circuit provides an FM modulated signal with an output power of around 500mW.  The input microphone pre-amp is built around a couple of 2N3904 transistors (Q1/Q2), and audio gain is limited by the 5k preset trim potentiometer. The oscillator is a Colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF ceramic capacitors and the L2 inductor....[Tony van Roon's circuit]
5 Watt FM Transmitter with Antenna 88-108 MHz -  Two stages -- AUDIO AMPLIFIER AND OSCILLATOR and RF POWER AMPLIFIER  (electronic schematic / circuit added 11/05)
60 Hz modulator records process variables -  02/16/98 EDN-Design Ideas....The circuit in Figure 1 allows you to record process variables (4 to 20 mA,0 to 10V dc]on a three-phase power monitor designed to record only ac waveforms. Many of se recorders have a seventh channel, normally used for recording neutral current, which you can use as a process-variable input. The circuit operates....[Design Idea by Warren Jochem, Research Triangle Institute, Research Triangle Park, NC]
68HC11 Function Generator -  (electronic schematic / circuit added 6/03)
98-108MHz FM audio transmitter -  ….(electronic schematic added 04/09) [Peter Jakab, Electrical Engineer, Engineer of Informatics]

Modulators:  #'s     A      C - D       E - F      G - L     M     N - O     P - R     S     T - V

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