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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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Square Wave Circuits
 

10 Second Ultra Lower Power Oscillator  -  This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. It is highly stable under varying temperature and supply voltages . . . [Circuit by David A. Johnson P.E.,  05/29/00]


100Khz Low Power Light Receiver  -  By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 microamps from a 3 volt supply . . . [Hobby Circuit designed by David Johnson P.E.,  04/17/05]


125Khz LC Oscillator  -  This circuit adds more invertors in parallel to deliver more power. It is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR.  Please note that the values shown are for 125KHz. . . . [Circuit by David Johnson P.E.,  03/12/02]


125KHZ Medium Power Ocsillator  -  This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . [Hobby Circuit designed by Dave Johnson P.E.,  03/12/02]

125Khz Oscillator from CMOS Inverters  -  This circuit inverts the LC components so the inductor is grounded.  Two inverters are needed to produce the needed oscillation.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . [Circuit by David A. Johnson P.E.,  03/12/02]


125khz Oscillator with Medium Power  -  This circuit adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . [Hobby Circuit designed by David Johnson P.E.,  03/12/02]


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 A. Johnson P.E.,  03/19/99]


40Khz Burst Laser Diode Driver  -  Some laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver. The circuit operates from three 1.5v cells (4.5v) that should provide enough energy . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]


Astable Multivibrator with Very Low Power  -  This classic circuit draws only 200 nanoamps from a 1.5v supply . . . [Hobby Circuit designed by David A. Johnson P.E.,  06/10/00]


CMOS Inverter 125khz LC Oscillator  -  This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values . . . [Circuit by David Johnson P.E.,  03/12/02]


CMOS Inverter forms a Resonant LD Oscillator   -  This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/12/02]


CMOS Inverter Parallel LC Oscillator  -  I have used this parallel resonant LC oscillator circuit countless times.  The oscillator frequency is determined by the inductor and capacitor values.  I have shown an adjustable inductor to make it easy to set the frequency to a specific value . . . [Circuit by David A. Johnson P.E.,  03/12/02]


CMOS Inverters Form 125Khz Oscillator  -  This circuit inverts the LC components so the inductor is grounded.  Two inverters are needed to produce the needed oscillation.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . [Hobby Circuit designed by David Johnson P.E.,  03/12/02]


CMOS Nand Gate Forms Gated 125Khz Oscillator  -  This circuit is uses a NAND gate as an inverter.  The gate allows the oscillator to be gated on and off.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . [Circuit by Dave Johnson P.E.,  03/12/02]


CMOS Oscillator, Draws Only 0.5ua  -  If truly low power oscillators interest you, this circuit draws a mere 2 microwatts (500nA) from a 6v battery. It uses a very inexpensive C-MOS IC to produce a frequency of 2Hz. However, by changing the component values you can push it to 300Hz . . . [Hobby Circuit designed by David Johnson P.E.,  06/03/00]


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]


 

Dave's SquareWave Oscillator Circuits: 
Page 1,   Page 2

Square Wave Circuits
 

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

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