 |
Circuits designed by David Johnson, P.E.
Last Updated on:
Thursday, March 22, 2012 07:43 AM
Master Category List
- Dave's Circuits
Text & Graphics
Copyright © David A. Johnson, PE - ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY to your WEB SITE server! |
|
|
|
|
Multivibrator Circuits |
- D-FLIP/FLOP ONE
SHOT CIRCUITS
Yes you can use cheap D flip/flop logic circuits as nice one-shot pulse
generators. This schematic shows how the popular CD4013 and the CD74HC74
can be used to generate pulses ranging from nanoseconds to seconds.
|
- 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.
|
|
|
|
|
|
- MICROPOWER C-MOS 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.
|
- Ultra Low Power Astable
Multivibrator
Taking advantage of some 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.
|
|
|
|
|
|
|
|
|
|
