Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 30,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

Custom Search of DiscoverCircuits.com

Converters: Voltage to Frequency, Page 4
Voltage Controlled Oscillators (VCO)
VCO; Voltage to Frequency Converters:  #'s - A     B - K     L - U    V - Z

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

Circuits Designed by Dave Johnson, P.E. :
  • VOLTAGE TO FREQUENCY CONVERTER + 1uS LED PULSE DRIVER 
    This circuit receives the signal from the above amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard infrared LED can emit ten times more light than conventional long pulse techniques. The circuit is described in more detail in the transmitter section of my Handbook of Optical Through the Air Communications.
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

V/F Converter ICs Handle Frequency-To-Voltage Needs -  National Semiconductor Application Note  (app note added 2/06)
V/I Converter Accommodates Grounded Load -  06/10/99 EDN-Design Ideas.....The voltage-to-current (V/I]converter in Figure 1 uses three common op amps, two medium-power transistors, and only a few passive components...... [Design Idea by Michele Frantisek, Brno, Czech Republic]
V/I Curve Tracer -  The V/I Curve Tracer is an indispensable tool for troubleshooting circuits and testing components. The circuit traces the current versus voltage curve for the component under test on an ordinary oscilloscope. The peak-to-peak test voltage.....
VCO 1420MHz...2250MHz -  ....
VCO has Digitally Programmable Center Frequency -  04/25/96 EDN-Design Ideas.....The circuits in Figure 1 illustrates a narrowband VCO, which has a digitally programmable center-frequency ratio of greater than 2-to-1...... [Design Idea by Paul Sofianos, Motorola LICD, Chandler, AZ]
VCO produces positive and negative output frequencies -  25-Dec-03 Issue of EDN  The circuit in Figure 1 is a quadrature-output VCO that provides both positive and negative output frequencies, depending on the polarity of the control-voltage input. The circuit provides a function that designers traditionally implement in analog music-effects units, such as Bode/Moog frequency shifters..... [Design Idea by Henry Walmsley, Farnborough, UK]
VCO Supply Touts Low Noise -  10/28/99 EDN-Design Ideas EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
VCO test  1000MHz...1500MHz -  ....
VCO test  1300MHz...2400MHz -  ....
VCO uses programmable logic -  14-Nov-02 Issue of EDN  A VCO (voltage-controlled oscillator] is an analog circuit, so you cannot find it in the libraries for the design of digital programmable chips. When you need such a circuit for synchronization or clock multiplication, you need to find a circuit that works with the standard digital functions, such as AND and NAND..... [Design Idea by Susanne Nell, Breitenfurt, Austria]
VCO  1000MHz...1500MHz -  ....
VCO  1200MHz...2400MHz -  ....
VCO  144MHz...146MHz -  ....
VCO  15MHz...25MHz -  ....
VCO  350MHz...1000MHz -  ....
VCO  450MHz...1000MHz -  ....
Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy -  National Semiconductor Application Note  (app note added 2/06)
VFC Makes Simple Capacitance Meter -  06/07/01 EDN-Design Ideas.....When you develop the prototype of a circuit using capacitors or when you replace an old, defective capacitor with a new one, you often need to know the value of the capacitor you use or replace. At times, the values printed on the capacitors are no longer readable. Also, the wide tolerance..... [Design Idea by K Suresh, Indira Gandhi Centre for Atomic Research, Kalpakkam, India]
Volt/F Converter Draws Flea Power -  04/24/97 EDN-Design Ideas.....The V/F converter in Figure 1 is unique because it draws less than 30 µA from one unregulated supply while converting bipolar input voltages. It produces three CMOS-compatible,0to 10-kHz outputs  one (F+]that becomes active when the input voltage is positive, another (F­]that takes..... [Design Idea by W Stephen Woodward, University of North Carolina, Chapel Hill, NC]
Voltage Controlled Switch using 555 -  In this circuit the 555 timer is used in a novel way, as a voltage controlled switch….(Circuit designed by Miroslav Adzic added 6/07)
Voltage Controls Sine Wave Frequency -  08/17/95 EDN-Design Ideas.....The circuit in Fig 1 generates a 50-Hz to 1-kHz sinusoidal waveform that exhibits lower than 60-dB THD. The input voltage controls the output frequency with the relationship 1 kHz/V. The output amplitude is invariant with frequency over the entire operating range. IC1 is a V/F converter..... [Design Idea by Yongping Xia, EBT Inc, Torrance, CA]
Voltage to Current Conversion Apex-AN13 -  Apex App Note.....
Voltage to Frequency Converter + 1us LED Pulse Driver -  This circuit receives the signal from the above amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard infrared LED can emit ten times more light than conventional long pulse techniques. The circuit is described in more detail in the transmitter section of my Handbook of Optical Through the Air Communications. …. [Designed by David A. Johnson]
Voltage-Controlled Resistor -  A common request from SPICE users is a voltage-controlled resistor. Although there's no SPICE component that directly models this device, you can easily put one together. There's several ways to do it. You can even extend the device to model more complex resistance functions like RTDs and thermistors.....(spice design added 02/09)
Voltage-controlled stereo Signal attenuator -  This is a voltage-controlled stereo signal attenuator. A 30-volt DC control voltage (the 300-ohm pot functions as a lamp-dimmer) energizes a lamp (I'm guessing the General Electric #313 is an ordinary miniature incandescent bulb) which radiates light energy onto the two "LOR 1-C" components. These are variable resistors.....(Circuit design added 7/06)
Voltage-to-current converter makes a flexible current reference -  18-Sep-03 Issue of EDN  The voltage-to-current converter in Figure 1 can both source and sink current. The circuit isflexible than some traditional current references that require different topologies for current sourcing and sinking. Also, you can easily adjust the value of the current reference by simply adjusting the circuit's input voltage..... [Design Idea by Art Kay, Texas Instruments, Tucson, AZ]
Voltage-To-Frequency/Frequency-To-Voltage Converter -  Microchip Application Note Published 12-Nov-02  (app note added 2/06)
Wide Band Zero Cross Detector -  This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal.  It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.  The input frequency can range from a few kilohertz to about 150KHz. …. [Designed by David A. Johnson]


 
HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info
 Linking is welcomed but COPYING any content or graphics to your web site is expressly prohibited.

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy