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

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Voltage Controlled Oscillators

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 Dave 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 Johnson P.E.,  12/12/04]

Air Transparency Monitor, Xenon Flash Receiver  -  I designed this receiver circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch . . . [Circuit by David A. Johnson P.E.,  06/17/00]

 

Air Transparency Monitor-Pg2  -  This is Page 2 of the receiver circuit AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER . . . [Circuit by Dave Johnson P.E.,  06/17/00]

 

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]

 

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]


More Voltage Controlled Oscillators

 

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Dave's Converter and/or Power Supply Circuits: 
DC to DC Power Supplies     Converters: Frequency to Voltage     Converters: Period to Voltage     Converters: Sine to Square Wave       Converters: Voltage     Converters: Voltage to Frequency     High Voltage Power Supplies

Dave's Oscillator Circuits:  Astable      Audio     Crystal     RF (Radio Frequency)     Sine Wave     Square Wave    
Triangle Wave      Voltage Controlled (VCO)   


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