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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

Master Category List - Dave's Circuits

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Voltage to Frequency Converters

 

1us LED Pulse Driver + Voltage to Frequency Converter  -  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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/22/99]


200Mhz-400Mhz Voltage Controlled Oscillator (VCO)  -  If you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses four voltage-controlled capacitors to change the frequency . . . [Circuit by David Johnson P.E.,  03/19/99]


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 . . . [Circuit by David A. Johnson P.E.,  12/12/04]

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 . . . [Circuit by Dave Johnson P.E.,  12/01/02]


ELC signal between 200Mhz-400Mhz  -  If you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses four voltage-controlled capacitors to change the frequency . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/19/99]


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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  05/04/08]


VCO from CMOS Schmitt Trigger IC  -  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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/12/02]


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 . . . [Circuit by David Johnson P.E.,  03/22/99]


Voltage to Frequency Converter-40Khz  -  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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/12/04]


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Dave's Circuits:  Frequency to Voltage   Period to Voltage   Sine to Square Wave   Voltage Converters   
DC -DC Power Supplies   High Voltage Power Supplies   Switchmode Power Supplies  Voltage Controlled Oscillators

 


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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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