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Oscillators:  Astable Circuits, Page 1
#'s - D       Es      T - Z

Oscillator Circuits -- Main Page
Last Updated on: Thursday, April 07, 2016 01:00 PM


Circuits Designed by Dave Johnson, P.E. :
  • 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 maximum of about 10KHz. It draws only about 1uA from a 3v battery. This circuit should not be used if frequency stability is important, since it will change as a function of supply voltage.
  • 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.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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....[Designed by David A. Johnson]
ALD555 Oscillation Circuit -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note - ]
An SCR Flipflop  for Alternating Flashing Light Bulbs -  ….(electronic schematic added 12/08)
Astable Flip Flop Circuits (techlib) -  Several circuits here.  The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. The bias resistors are directly connected....(added 04/05/06)
Astable Mode Operation 50% Duty Cycle -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note - ]
Astable Mode Operation Free Running Oscillator -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note - ]
Astable Multivibrator -  The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7 connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the supply and pin 2 detects this and turns off pin 7 to repeat the cycle....

Astable Multivibrator -  As shown in the schematic diagram here, the astable multivibrator simply extends the modification that converted the bistable multivibrator to a monostable version of the circuit. Now, both transistors are coupled to each other through capacitors. Whichever transistor....(electronic circuit added 7/03)
Astable Multivibrator (Bill Bowden) -  Scroll to find this circuit.  This is an astable multivibrator circuits to alternately flash two LEDs.  The R & C values determins….(electronic schematic / circuit added 4/02)
Astable multivibrator (blinkie) -  A pulse generator, or astable, circuit can be made using four resistors, two capacitors, two LEDs and two transistors. 'Blinkie' uses these components to form a face, with the flashing LEDs representing the eyes. (electronic design added 08/08/08
Astable multivibrator gets hysteresis from positive feedback stage -  22-Oct-09 Issue of EDN  Add hysteresis through positive feedback.... [Design Idea by Robert Larson, Seattle, WA]
Astable multivibrator lights LED from a single cell -  21-Aug-08 Issue of EDN  A classical multivibrator drives a step-up inductor to power an LED from a single cell.... [Design Idea by Luca Bruno, ITIS Hensemberger, Monza, Lissone, Italy]
Astable Multivibrator Projects -  Astable or free-running multivibrators have been used in home-built amateur radio equipment for many years. The basic circuit is a two stage Amplifier with AC-coupled feedback from output to input. One transistor stage is on ( conducting current ) while....(designed added 08/08/08)
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 maximum of about 10KHz. It draws only about 1uA from a 3v battery.  This circuit should not be used if frequency stability is important, since it will change as a function of supply voltage.... [Designed by David A. Johnson]
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 …. [Designed by David A. Johnson]
Dummy Alarm -  This project makes a superbright LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. This is a simple project, ideal for a beginner.... [Designed by John Hewes]
 
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Oscillators:  Astable Circuits:  #'s - D       Es      T - Z


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