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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

Master Category List - Dave's Circuits

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Astable 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 Johnson P.E.,  05/29/00]


3 Volt Low Battery Voltage Flasher  -  This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment . . . [Circuit by David A. Johnson P.E.,  01/01/98]


3v 2hz Oscillator  -  This is yet another method to generate low frequency output pulses. The circuit uses an inexpensive under-voltage monitor IC and a couple of cheap MOSFETs. It could easily be modified to produce pulse frequencies from about one cycle per minute to a maxim . . . [Circuit by David A. Johnson P.E.,  06/17/00]

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


Astable Ultra Low Power Multivibrator  -  Taking advantage of some new voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 micro Amps.  With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal . . . [Hobby Circuit designed by David Johnson P.E.,  12/18/04]


Button Battery Cell Internal Resistance Measurement Circuit  -  The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell.  However, there is a relationship between battery health and the internal resistance of the cell. This circuit when used . . . [Circuit by Dave Johnson P.E.,  07/11/06]


Cheap Low Power 3v 2hz Oscillator  -  This is yet another method to generate low frequency output pulses. The circuit uses an inexpensive under-voltage monitor IC and a couple of cheap MOSFETs. It could easily be modified to produce pulse frequencies from about one cycle per minute to a maxim . . . [Hobby Circuit designed by David Johnson P.E.,  06/17/00]


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 A. 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 David Johnson P.E.,  12/01/02]


Highly Stable 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. . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/29/00]


Low Battery Voltage Flasher  -  This circuit is designed to monitor two alkaline cells (3v) that from the battery often used in portable electronic equipment. It use an inexpensive IC from Panasonic that is connected to an efficient LED flashing circuit. When the battery voltage drops below a certain point the circuit flashes the LED. In the off state the circuit draws only 1uA, while in the active flashing state it draws 20uA.  . . . [Circuit by Dave Johnson P.E.,  01/01/98]


Low Frequency Oscillator draws only 2 Nanoamps  -  If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . [Circuit by David Johnson P.E.,  07/11/06]


Measure Button Battery Cell's Internal Resistance   -  The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell.  However, there is a relationship between battery health and the internal resistance of the cell. This circuit when used . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]


Micropower 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 . . . [Circuit by Dave Johnson P.E.,  06/03/00]


Octillator with Ultra Low Current  -  Here is a challenge.  Design an astable oscillator which draws only a few nanoamps of current from a +3v supply.  I gave this some thought and came up with the circuit below.  I used some pretty standard parts except for three surface mounted 1000M resist . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/08/09]


Oscillator Draws 2 Nanoamps  -  If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]


Precision 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]


Ten-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 Dave Johnson P.E.,  05/29/00]


Ultra Low Current Oscillator  -  Here is a challenge.  Design an astable oscillator which draws only a few nanoamps of current from a +3v supply.  I gave this some thought and came up with the circuit below.  I used some pretty standard parts except for three surface mounted 1000M resistors I had on hand.  The oscillator frequency measured a low 1Hz frequency and the average current was a very low 3 nanoamps.  If I had some higher resistors values handy, I think I could have gotten the current down below one nanoamp . . . [Circuit by David A. Johnson P.E.,  03/08/09]


Ultra Low Current Oscillator #4   -  The circuit below was inspired by a programmable unjunction transistor (PUJT) circuit sent to me by Karl Isbrecht.  In Karl’s circuit, the unijunction circuit made click sounds in a speaker and consumed very little power.  His circuit reminded me that a PU . . . [Circuit by David Johnson P.E.,  01/31/10]


Ultra Low Power Astable Multivibrator  -  Taking advantage of some new voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 micro Amps.  With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal . . . [Circuit by Dave Johnson P.E.,  12/18/04]


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 Johnson P.E.,  05/29/00]


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 Johnson P.E.,  03/12/02]


Version 4 of a Ultra Low Current Oscillator  -  The circuit below was inspired by a programmable unjunction transistor (PUJT) circuit sent to me by Karl Isbrecht.  In Karl’s circuit, the unijunction circuit made click sounds in a speaker and consumed very little power.  His circuit reminded me that a PU . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/31/10]


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

Astable Circuits

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


Master Category List - Dave's Circuits

 


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