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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, August 18, 2008 04:16 PM
| Circuits Designed by Dave Johnson, P.E. : |
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- 40KHz Voltage to Frequency Converter
This circuit was designed to frequency modulate a 40KHz carrier, using human voice frequencies. A common flip/flop is used at the core of the circuit. (added
12/04)
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- CMOS SCHMITT TRIGGER IC MAKES VCO
By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the
output of the 4584 to maintain a constant TTL logic level signal.
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Light to Frequency Converter
This circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter. A small PIN photo diode is used as the light detector. The pulses
produced are short, so in some applications you may want to stretch them or feed them through a flip/flop to produce a square wave signal. Although the circuit shown is designed for a
5v supply, it could operate from almost any voltage from 3v to 15v.
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| Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors: |
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Universal Watchdog Fully Controls µ Preset: 05/25/95 EDN-Design Ideas / (added 3/03) Many µPs contain internal watchdog
timers, and you may wonder why you need another stand-alone circuit. Unfortunately, more highly integrated functions have preset parameters that you may want to change. Also, internal
watchdogs are generally a simple combination of a flip-flop and a timer. If the program does not start properly on the first try, the timer is of no use because the program never turns on the
watchdog. This watchdog catches exactly this condition.... |
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Using the AD650 Voltage-to-Frequency Converter as a Frequency-to-Voltage Converter: AN-279 Analog Devices Application Notes
(app note added 2/06) |
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V/F Converter Draws Flea Power: 04/24/97 EDN-Design Ideas / (added 1/06) 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 over for negative inputs, and a third (FABS) that produces a frequency proportional to the absolute value of the input. Linearity is
better than 0.1%, and the full-scale span and offset drift are typically less than 100 ppm/ºC and 2 µV/ºC, respectively.... |
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V/F Converter ICs Handle Frequency-To-Voltage Needs: National Semiconductor Application Note (app note added 2/06) |
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VCO has Digitally Programmable Center Frequency: 04/25/96 EDN-Design Ideas / (added 3/03) |
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VCO Produces Positive and Negative Output Frequencies: 12/25/03 EDN Design Ideas / (added 1/05) 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.... |
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VCO Supply Touts Low Noise: 10/28/99 EDN-Design Ideas / (added 11/05) |
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VCO uses Programmable Logic: 11/14/02 EDN Design Ideas / (added 1/05) 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.... |
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Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy: National Semiconductor Application Note (app note added 2/06) |
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VFC Makes Simple Capacitance Meter: 06/07/01EDN-Design Ideas / (added 1/06) 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 band of the capacitors can leave you making a wild guess about the capacitor value. In these situations, you normally go looking for
an LCR bridge of a DMM with a capacitance-measurement facility. Not all DMMs have this feature, and finding the capacitance value from an LCR bridge is a cumbersome process.... |
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Volt/F Converter Draws Flea Power: 04/24/97 EDN-Design Ideas / (added 3/03) |
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Voltage Controlled Panner: (electronic circuit added 7/03) |
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Voltage Controls Sine Wave Frequency: 08/17/95 EDN-Design Ideas / (added 3/03) |
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Voltage-To-Frequency/Frequency-To-Voltage Converter: Microchip Application Note Published 12-Nov-02 (app note
added 2/06) |
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