Page 10, Links to Modulator Electronic Circuits

Modulators Circuits Page 10
Modulators: #'s A C - D E - F G - L M N - O P - R S T - V
Last Updated on: Monday, October 03, 2011 06:09 PM

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

Telephone Transmitter FM - Receive telephone conversations on any FM radio with this neat little device…. [Tony van Roon's circuit]

Timer with 555 - Some useful circuits using the LM555 IC. Scroll to find the Timer with 555 circuit (11/06)

Transistor pair lowers PWM IC’s start-up current - 03/18/99 EDN-Design Ideas....An auxiliary winding usually provides power for the popular UC384X-based offline switch-mode power supplies (SMPSs). This winding feeds the main PWM controller….PDF contains multiple circuits, scroll to find this circuit.… [Design Idea by Christophe Basso,Motorola Semiconductor,Toulouse, France]

TV Modulator - This circuit uses an MC1373 to form a TV video modulator (added 5/02)

Two Transistor Circuit Replaces IC - Bi-directional IIC buffer is enhanced to add an enable pin accommodating hot-swappable operation. Replaced LTC4300.… [Jim Haggerman, Hagerman Technology LLC]

Two Transistor FM Transmitters (Rob van der Weijden) - A compact 2 transistor transmitter for use at VHF frequencies…. [Andy Collison's circuit]

Unused port adds a PWM/analog channel to a microcontroller - 8-Oct-09 Issue of EDN Take advantage of unused pins to generate a PWM signal and then filter it into analog....[Design Idea by Vishwas Vaidya, Tata Motors Ltd, Pune, India]

Variable Range PWM A/D for COP820CJ - National Semiconductor Application Note (app note added 2/06)

Variations on the PWM DC Motor Speed Control - The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version is in fact, identical to the original circuit when wired for 12V operation. The low side version allows the use of higher power and more inexpensive N Channel FETs, whereas the high side version, which uses P Channel FETs is used where common ground load wiring is a requirement. [G. Forrest Cook]

VHF/UHF TV Modulator - Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial input via a cable. Then all that remains to do is tune the TV to the correct frequency.

Video Design Idea: Leverage PWM output and add a low-cost DAC to your system - 19-Jul-07 Issue of EDN Bonnie Baker demonstrates a simple way to add DAC functionality to a microcontroller-based system using only an op amp and two passive components....[Design Idea by Bonnie Baker, senior applications engineer at Texas Instruments and regular EDN columnist]

Voltage Controlled Mixer with Modulator - (electronic circuit added 7/03)

Waveform Generator Demodulates FM Signals - 10/10/96 EDN-Design Ideas....The circuit in Figure 1 uses the phase-detector signals of a precision waveform-generator IC to perform FM demodulation. In a standard application, the IC's phase-detector input and output synchronize the chip's output frequency to that of an applied signal. If the signal is FM, you can extract the demodulated signal from the phase-detector output. The waveform generator....[Design Idea by Doug Vargha, Maxim Integrated Products, Sunnyvale, CA]

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