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ALD555 Oscillation Circuit - Circuit Ideas for Designers Application Notes
Advanced Linear Devices, Inc. (app note added 6/06) |
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An SCR Flipflop for Alternating Flashing Light Bulbs -
.(electronic
schematic added 12/08) |
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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) |
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Astable Mode Operation 50% Duty Cycle - Circuit Ideas for Designers Application
Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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Astable Mode Operation Free Running Oscillator - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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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) |
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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) |
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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 |
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Astable multivibrator lights LED from a single cell - 08/21/08 EDN-Design Ideas: A
classical multivibrator drives a step-up inductor to power an LED from a single
cell.....(design idea added 09/08) |
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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) |
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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) |
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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) |
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Flip Flop Circuit - In this project we examine one of the most valuable circuits
to be invented, the flip flop. Originally it was designed with VALVES, along with its
simpler version (without the two capacitors, called a bi-stable Multivibrator), it was
realised it
(circuits added 04/09) |
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Flip Flop Flashers Buzzers Etc - 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) |
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Low Power Oscillators - This page has two unusual two-transistor oscillators.
I set the component values for a low frequency application. Both circuits draw
only about 1 microamp of current. (added 12/04)
.(designed by David A. Johnson) |
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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. The circuit draws much less current
than traditional C-MOS oscillators using a Schmitt trigger inverter. It also produces
fast leading edges. However, if you need more drive current, a C-MOS buffer should be
included. Published in EDN, September 2, 1993.
.(designed by David A. Johnson) |
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Oscillator Draws 2 Nanoamps - This page shows two low frequency oscillators that
draw ultra low current.
.(designed by David A. Johnson) |
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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.
.(designed by David A. Johnson) |
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Quad Astable Mode Operation Free Running Oscillator - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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SCR Flipflop for Alternating Flashing Light Bulbs -
.(electronic schematic
added 12/08) |
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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.
.(designed by David A.
Johnson) |
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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
microamps. With the inclusion of a diode, the circuit can also produce short
pulses instead of a square wave signal. (added 12/04)
.(designed by David A.
Johnson) |
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Very Low Power Astable Multivibrator - This classic circuit draws only 200
nanoamps from a 1.5v supply.
.(designed by David A. Johnson) |
