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Oscillators:  Astable Circuits
#'s - H       I - Z     

Oscillator Circuits -- Main Page
 

Last Updated: October 18, 2017 05:04 AM

Circuits Designed by Dave Johnson, P.E. :

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 Dave Johnson P.E.-January, 1998

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.-July, 2006

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.-July, 2006

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.-June, 2000

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.-July, 2006

Oscillator 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.-March, 2009

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.-May, 2000

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.-May, 2000

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.-March, 2009

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.-January, 2010

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.-December, 2004

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.-May, 2000

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.-March, 2002

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.-January, 2010

Very Low Power Astable Multivibrator - This classic circuit draws only 200 nanoamps from a 1.5v supply. . . Circuit by David A. Johnson P.E.-June, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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 Dave Johnson P.E.-January, 1998

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.-July, 2006

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.-July, 2006

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.-June, 2000

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.-July, 2006

Oscillator 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.-March, 2009

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.-May, 2000

Quad Astable Mode Operation Free Running Oscillator -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Random' Flasher for 8 LEDs -  This project uses a 4026 counter and display driver IC to flash eight LEDs in an apparently random manner.  It can be used to create a display of your choice.   __ Designed by John Hewes

SCR Flipflop for Alternating Flashing Light Bulbs -  Schematic only __ Designed by G.L. Chemelec

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.-May, 2000

Turn a Set/Reset Latch Into an Astable/Monostable Multivibrator -  3-Sep-09 EDN-Design Ideas - Use latches with either active-high or active-low inputs __ Circuit Design by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy

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.-March, 2009

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.-January, 2010

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.-December, 2004

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.-May, 2000

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.-March, 2002

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.-January, 2010

Very Low Power Astable Multivibrator -  This classic circuit draws only 200 nanoamps from a 1.5v supply. . . Circuit by David A. Johnson P.E.-June, 2000


Oscillators:  Astable Circuits     #'s - H       I - Z     

 


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